Initial server_ssl_cert_fingerprint ACL implementation.

[thirdparty/squid.git] / src / cf.data.pre

#
# SQUID Web Proxy Cache         http://www.squid-cache.org/
# ----------------------------------------------------------
#
#  Squid is the result of efforts by numerous individuals from
#  the Internet community; see the CONTRIBUTORS file for full
#  details.   Many organizations have provided support for Squid's
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#  Copyrighted (C) 2000 by the Regents of the University of
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#  incorporates software developed and/or copyrighted by other
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#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
#

COMMENT_START
        WELCOME TO @SQUID@
        ----------------------------
        
        This is the documentation for the Squid configuration file.
        This documentation can also be found online at:
                http://www.squid-cache.org/Doc/config/
        
        You may wish to look at the Squid home page and wiki for the
        FAQ and other documentation:
                http://www.squid-cache.org/
                http://wiki.squid-cache.org/SquidFaq
                http://wiki.squid-cache.org/ConfigExamples
        
        This documentation shows what the defaults for various directives
        happen to be.  If you don't need to change the default, you should
        leave the line out of your squid.conf in most cases.
        
        In some cases "none" refers to no default setting at all,
        while in other cases it refers to the value of the option
        - the comments for that keyword indicate if this is the case.

COMMENT_END

COMMENT_START
  Configuration options can be included using the "include" directive.
  Include takes a list of files to include. Quoting and wildcards are
  supported.

  For example,

  include /path/to/included/file/squid.acl.config

  Includes can be nested up to a hard-coded depth of 16 levels.
  This arbitrary restriction is to prevent recursive include references
  from causing Squid entering an infinite loop whilst trying to load
  configuration files.


  Conditional configuration

        If-statements can be used to make configuration directives
        depend on conditions:

            if <CONDITION>
                ... regular configuration directives ...
            [else
                ... regular configuration directives ...]
            endif

        The else part is optional. The keywords "if", "else", and "endif"
        must be typed on their own lines, as if they were regular
        configuration directives.

        NOTE: An else-if condition is not supported.

        These individual conditions types are supported:

            true
                Always evaluates to true.
            false
                Always evaluates to false.
            <integer> = <integer>
                Equality comparison of two integer numbers.


  SMP-Related Macros

        The following SMP-related preprocessor macros can be used.

        ${process_name} expands to the current Squid process "name"
        (e.g., squid1, squid2, or cache1).

        ${process_number} expands to the current Squid process
        identifier, which is an integer number (e.g., 1, 2, 3) unique
        across all Squid processes.
COMMENT_END

# Options Removed in 3.2
NAME: ignore_expect_100
TYPE: obsolete
DOC_START
        Remove this line. The HTTP/1.1 feature is now fully supported by default.
DOC_END

NAME: dns_v4_fallback
TYPE: obsolete
DOC_START
        Remove this line.
DOC_END

NAME: ftp_list_width
TYPE: obsolete
DOC_START
        Remove this line. Configure FTP page display using the CSS controls in errorpages.css instead.
DOC_END

NAME: maximum_single_addr_tries
TYPE: obsolete
DOC_START
        Replaced by connect_retries. The behaviour has changed, please read the documentation before altering.
DOC_END

NAME: url_rewrite_concurrency
TYPE: obsolete
DOC_START
        Remove this line. Set the 'concurrency=' option of url_rewrite_children instead.
DOC_END

# Options Removed in 3.1
NAME: dns_testnames
TYPE: obsolete
DOC_START
        Remove this line. DNS is no longer tested on startup.
DOC_END

NAME: extension_methods
TYPE: obsolete
DOC_START
        Remove this line. All valid methods for HTTP are accepted by default.
DOC_END

# 2.7 Options Removed/Replaced in 3.2
NAME: zero_buffers
TYPE: obsolete
DOC_NONE

# 2.7 Options Removed/Replaced in 3.1
NAME: incoming_rate
TYPE: obsolete
DOC_NONE

NAME: server_http11
TYPE: obsolete
DOC_START
        Remove this line. HTTP/1.1 is supported by default.
DOC_END

NAME: upgrade_http0.9
TYPE: obsolete
DOC_START
        Remove this line. ICY/1.0 streaming protocol is supported by default.
DOC_END

NAME: zph_local zph_mode zph_option zph_parent zph_sibling
TYPE: obsolete
DOC_START
        Alter these entries. Use the qos_flows directive instead.
DOC_END

# Options Removed in 3.0
NAME: header_access
TYPE: obsolete
DOC_START
        Since squid-3.0 replace with request_header_access or reply_header_access
        depending on whether you wish to match client requests or server replies.
DOC_END

NAME: httpd_accel_no_pmtu_disc
TYPE: obsolete
DOC_START
        Since squid-3.0 use the 'disable-pmtu-discovery' flag on http_port instead.
DOC_END

COMMENT_START
 OPTIONS FOR AUTHENTICATION
 -----------------------------------------------------------------------------
COMMENT_END

NAME: auth_param
TYPE: authparam
IFDEF: USE_AUTH
LOC: Auth::TheConfig
DEFAULT: none
DOC_START
        This is used to define parameters for the various authentication
        schemes supported by Squid.

        format: auth_param scheme parameter [setting]

        The order in which authentication schemes are presented to the client is
        dependent on the order the scheme first appears in config file. IE
        has a bug (it's not RFC 2617 compliant) in that it will use the basic
        scheme if basic is the first entry presented, even if more secure
        schemes are presented. For now use the order in the recommended
        settings section below. If other browsers have difficulties (don't
        recognize the schemes offered even if you are using basic) either
        put basic first, or disable the other schemes (by commenting out their
        program entry).

        Once an authentication scheme is fully configured, it can only be
        shutdown by shutting squid down and restarting. Changes can be made on
        the fly and activated with a reconfigure. I.E. You can change to a
        different helper, but not unconfigure the helper completely.

        Please note that while this directive defines how Squid processes
        authentication it does not automatically activate authentication.
        To use authentication you must in addition make use of ACLs based
        on login name in http_access (proxy_auth, proxy_auth_regex or
        external with %LOGIN used in the format tag). The browser will be
        challenged for authentication on the first such acl encountered
        in http_access processing and will also be re-challenged for new
        login credentials if the request is being denied by a proxy_auth
        type acl.

        WARNING: authentication can't be used in a transparently intercepting
        proxy as the client then thinks it is talking to an origin server and
        not the proxy. This is a limitation of bending the TCP/IP protocol to
        transparently intercepting port 80, not a limitation in Squid.
        Ports flagged 'transparent', 'intercept', or 'tproxy' have
        authentication disabled.

        === Parameters for the basic scheme follow. ===

        "program" cmdline
        Specify the command for the external authenticator.  Such a program
        reads a line containing "username password" and replies "OK" or
        "ERR" in an endless loop. "ERR" responses may optionally be followed
        by a error description available as %m in the returned error page.
        If you use an authenticator, make sure you have 1 acl of type
        proxy_auth.

        By default, the basic authentication scheme is not used unless a
        program is specified.

        If you want to use the traditional NCSA proxy authentication, set
        this line to something like

        auth_param basic program @DEFAULT_PREFIX@/libexec/ncsa_auth @DEFAULT_PREFIX@/etc/passwd

        "utf8" on|off
        HTTP uses iso-latin-1 as characterset, while some authentication
        backends such as LDAP expects UTF-8. If this is set to on Squid will
        translate the HTTP iso-latin-1 charset to UTF-8 before sending the
        username & password to the helper.

        "children" numberofchildren [startup=N] [idle=N] [concurrency=N]
        The maximum number of authenticator processes to spawn. If you start too few
        Squid will have to wait for them to process a backlog of credential
        verifications, slowing it down. When password verifications are
        done via a (slow) network you are likely to need lots of
        authenticator processes.

        The startup= and idle= options permit some skew in the exact amount
        run. A minimum of startup=N will begin during startup and reconfigure.
        Squid will start more in groups of up to idle=N in an attempt to meet
        traffic needs and to keep idle=N free above those traffic needs up to
        the maximum.

        The concurrency= option sets the number of concurrent requests the
        helper can process.  The default of 0 is used for helpers who only
        supports one request at a time. Setting this to a number greater than
        0 changes the protocol used to include a channel number first on the
        request/response line, allowing multiple requests to be sent to the
        same helper in parallell without wating for the response.
        Must not be set unless it's known the helper supports this.

        auth_param basic children 20 startup=0 idle=1

        "realm" realmstring
        Specifies the realm name which is to be reported to the
        client for the basic proxy authentication scheme (part of
        the text the user will see when prompted their username and
        password). There is no default.
        auth_param basic realm Squid proxy-caching web server

        "credentialsttl" timetolive
        Specifies how long squid assumes an externally validated
        username:password pair is valid for - in other words how
        often the helper program is called for that user. Set this
        low to force revalidation with short lived passwords.  Note
        setting this high does not impact your susceptibility
        to replay attacks unless you are using an one-time password
        system (such as SecureID).  If you are using such a system,
        you will be vulnerable to replay attacks unless you also
        use the max_user_ip ACL in an http_access rule.

        "casesensitive" on|off
        Specifies if usernames are case sensitive. Most user databases are
        case insensitive allowing the same username to be spelled using both
        lower and upper case letters, but some are case sensitive. This
        makes a big difference for user_max_ip ACL processing and similar.
        auth_param basic casesensitive off

        === Parameters for the digest scheme follow ===

        "program" cmdline
        Specify the command for the external authenticator.  Such
        a program reads a line containing "username":"realm" and
        replies with the appropriate H(A1) value hex encoded or
        ERR if the user (or his H(A1) hash) does not exists.
        See rfc 2616 for the definition of H(A1).
        "ERR" responses may optionally be followed by a error description
        available as %m in the returned error page.

        By default, the digest authentication scheme is not used unless a
        program is specified.

        If you want to use a digest authenticator, set this line to
        something like

        auth_param digest program @DEFAULT_PREFIX@/bin/digest_pw_auth @DEFAULT_PREFIX@/etc/digpass

        "utf8" on|off
        HTTP uses iso-latin-1 as characterset, while some authentication
        backends such as LDAP expects UTF-8. If this is set to on Squid will
        translate the HTTP iso-latin-1 charset to UTF-8 before sending the
        username & password to the helper.

        "children" numberofchildren [startup=N] [idle=N] [concurrency=N]
        The maximum number of authenticator processes to spawn (default 5).
        If you start too few Squid will have to wait for them to
        process a backlog of H(A1) calculations, slowing it down.
        When the H(A1) calculations are done via a (slow) network
        you are likely to need lots of authenticator processes.

        The startup= and idle= options permit some skew in the exact amount
        run. A minimum of startup=N will begin during startup and reconfigure.
        Squid will start more in groups of up to idle=N in an attempt to meet
        traffic needs and to keep idle=N free above those traffic needs up to
        the maximum.

        The concurrency= option sets the number of concurrent requests the
        helper can process.  The default of 0 is used for helpers who only
        supports one request at a time. Setting this to a number greater than
        0 changes the protocol used to include a channel number first on the
        request/response line, allowing multiple requests to be sent to the
        same helper in parallell without wating for the response.
        Must not be set unless it's known the helper supports this.

        auth_param digest children 20 startup=0 idle=1

        "realm" realmstring
        Specifies the realm name which is to be reported to the
        client for the digest proxy authentication scheme (part of
        the text the user will see when prompted their username and
        password). There is no default.
        auth_param digest realm Squid proxy-caching web server

        "nonce_garbage_interval" timeinterval
        Specifies the interval that nonces that have been issued
        to client_agent's are checked for validity.

        "nonce_max_duration" timeinterval
        Specifies the maximum length of time a given nonce will be
        valid for.

        "nonce_max_count" number
        Specifies the maximum number of times a given nonce can be
        used.

        "nonce_strictness" on|off
        Determines if squid requires strict increment-by-1 behavior
        for nonce counts, or just incrementing (off - for use when
        useragents generate nonce counts that occasionally miss 1
        (ie, 1,2,4,6)). Default off.

        "check_nonce_count" on|off
        This directive if set to off can disable the nonce count check
        completely to work around buggy digest qop implementations in
        certain mainstream browser versions. Default on to check the
        nonce count to protect from authentication replay attacks.

        "post_workaround" on|off
        This is a workaround to certain buggy browsers who sends
        an incorrect request digest in POST requests when reusing
        the same nonce as acquired earlier on a GET request.

        === NTLM scheme options follow ===

        "program" cmdline
        Specify the command for the external NTLM authenticator.
        Such a program reads exchanged NTLMSSP packets with
        the browser via Squid until authentication is completed.
        If you use an NTLM authenticator, make sure you have 1 acl
        of type proxy_auth.  By default, the NTLM authenticator_program
        is not used.

        auth_param ntlm program @DEFAULT_PREFIX@/bin/ntlm_auth

        "children" numberofchildren [startup=N] [idle=N]
        The maximum number of authenticator processes to spawn (default 5).
        If you start too few Squid will have to wait for them to
        process a backlog of credential verifications, slowing it
        down. When credential verifications are done via a (slow)
        network you are likely to need lots of authenticator
        processes.

        The startup= and idle= options permit some skew in the exact amount
        run. A minimum of startup=N will begin during startup and reconfigure.
        Squid will start more in groups of up to idle=N in an attempt to meet
        traffic needs and to keep idle=N free above those traffic needs up to
        the maximum.

        auth_param ntlm children 20 startup=0 idle=1

        "keep_alive" on|off
        If you experience problems with PUT/POST requests when using the
        Negotiate authentication scheme then you can try setting this to
        off. This will cause Squid to forcibly close the connection on
        the initial requests where the browser asks which schemes are
        supported by the proxy.

        auth_param ntlm keep_alive on

        === Options for configuring the NEGOTIATE auth-scheme follow ===

        "program" cmdline
        Specify the command for the external Negotiate authenticator.
        This protocol is used in Microsoft Active-Directory enabled setups with
        the Microsoft Internet Explorer or Mozilla Firefox browsers.
        Its main purpose is to exchange credentials with the Squid proxy
        using the Kerberos mechanisms.
        If you use a Negotiate authenticator, make sure you have at least
        one acl of type proxy_auth active. By default, the negotiate
        authenticator_program is not used.
        The only supported program for this role is the ntlm_auth
        program distributed as part of Samba, version 4 or later.

        auth_param negotiate program @DEFAULT_PREFIX@/bin/ntlm_auth --helper-protocol=gss-spnego

        "children" numberofchildren [startup=N] [idle=N]
        The maximum number of authenticator processes to spawn (default 5).
        If you start too few Squid will have to wait for them to
        process a backlog of credential verifications, slowing it
        down. When crendential verifications are done via a (slow)
        network you are likely to need lots of authenticator
        processes.

        The startup= and idle= options permit some skew in the exact amount
        run. A minimum of startup=N will begin during startup and reconfigure.
        Squid will start more in groups of up to idle=N in an attempt to meet
        traffic needs and to keep idle=N free above those traffic needs up to
        the maximum.

        auth_param negotiate children 20 startup=0 idle=1

        "keep_alive" on|off
        If you experience problems with PUT/POST requests when using the
        Negotiate authentication scheme then you can try setting this to
        off. This will cause Squid to forcibly close the connection on
        the initial requests where the browser asks which schemes are
        supported by the proxy.

        auth_param negotiate keep_alive on

        
        Examples:

#Recommended minimum configuration per scheme:
#auth_param negotiate program <uncomment and complete this line to activate>
#auth_param negotiate children 20 startup=0 idle=1
#auth_param negotiate keep_alive on
#
#auth_param ntlm program <uncomment and complete this line to activate>
#auth_param ntlm children 20 startup=0 idle=1
#auth_param ntlm keep_alive on
#
#auth_param digest program <uncomment and complete this line>
#auth_param digest children 20 startup=0 idle=1
#auth_param digest realm Squid proxy-caching web server
#auth_param digest nonce_garbage_interval 5 minutes
#auth_param digest nonce_max_duration 30 minutes
#auth_param digest nonce_max_count 50
#
#auth_param basic program <uncomment and complete this line>
#auth_param basic children 5 startup=5 idle=1
#auth_param basic realm Squid proxy-caching web server
#auth_param basic credentialsttl 2 hours
DOC_END

NAME: authenticate_cache_garbage_interval
TYPE: time_t
DEFAULT: 1 hour
LOC: Config.authenticateGCInterval
DOC_START
        The time period between garbage collection across the username cache.
        This is a tradeoff between memory utilization (long intervals - say
        2 days) and CPU (short intervals - say 1 minute). Only change if you
        have good reason to.
DOC_END

NAME: authenticate_ttl
TYPE: time_t
DEFAULT: 1 hour
LOC: Config.authenticateTTL
DOC_START
        The time a user & their credentials stay in the logged in
        user cache since their last request. When the garbage
        interval passes, all user credentials that have passed their
        TTL are removed from memory.
DOC_END

NAME: authenticate_ip_ttl
TYPE: time_t
LOC: Config.authenticateIpTTL
DEFAULT: 0 seconds
DOC_START
        If you use proxy authentication and the 'max_user_ip' ACL,
        this directive controls how long Squid remembers the IP
        addresses associated with each user.  Use a small value
        (e.g., 60 seconds) if your users might change addresses
        quickly, as is the case with dialups.   You might be safe
        using a larger value (e.g., 2 hours) in a corporate LAN
        environment with relatively static address assignments.
DOC_END

COMMENT_START
 ACCESS CONTROLS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: external_acl_type
TYPE: externalAclHelper
LOC: Config.externalAclHelperList
DEFAULT: none
DOC_START
        This option defines external acl classes using a helper program
        to look up the status

          external_acl_type name [options] FORMAT.. /path/to/helper [helper arguments..]

        Options:

          ttl=n         TTL in seconds for cached results (defaults to 3600
                        for 1 hour)
          negative_ttl=n
                        TTL for cached negative lookups (default same
                        as ttl)
          children-max=n
                        Maximum number of acl helper processes spawned to service
                        external acl lookups of this type. (default 20)
          children-startup=n
                        Minimum number of acl helper processes to spawn during
                        startup and reconfigure to service external acl lookups
                        of this type. (default 0)
          children-idle=n
                        Number of acl helper processes to keep ahead of traffic
                        loads. Squid will spawn this many at once whenever load
                        rises above the capabilities of existing processes.
                        Up to the value of children-max. (default 1)
          concurrency=n concurrency level per process. Only used with helpers
                        capable of processing more than one query at a time.
          cache=n       limit the result cache size, default is unbounded.
          grace=n       Percentage remaining of TTL where a refresh of a
                        cached entry should be initiated without needing to
                        wait for a new reply. (default is for no grace period)
          protocol=2.5  Compatibility mode for Squid-2.5 external acl helpers
          ipv4 / ipv6   IP protocol used to communicate with this helper.
                        The default is to auto-detect IPv6 and use it when available.

        FORMAT specifications

          %LOGIN        Authenticated user login name
          %EXT_USER     Username from previous external acl
          %EXT_LOG      Log details from previous external acl
          %EXT_TAG      Tag from previous external acl
          %IDENT        Ident user name
          %SRC          Client IP
          %SRCPORT      Client source port
          %URI          Requested URI
          %DST          Requested host
          %PROTO        Requested protocol
          %PORT         Requested port
          %PATH         Requested URL path
          %METHOD       Request method
          %MYADDR       Squid interface address
          %MYPORT       Squid http_port number
          %PATH         Requested URL-path (including query-string if any)
          %USER_CERT    SSL User certificate in PEM format
          %USER_CERTCHAIN SSL User certificate chain in PEM format
          %USER_CERT_xx SSL User certificate subject attribute xx
          %USER_CA_xx   SSL User certificate issuer attribute xx

          %>{Header}    HTTP request header "Header"
          %>{Hdr:member}
                        HTTP request header "Hdr" list member "member"
          %>{Hdr:;member}
                        HTTP request header list member using ; as
                        list separator. ; can be any non-alphanumeric
                        character.

          %<{Header}    HTTP reply header "Header"
          %<{Hdr:member}
                        HTTP reply header "Hdr" list member "member"
          %<{Hdr:;member}
                        HTTP reply header list member using ; as
                        list separator. ; can be any non-alphanumeric
                        character.

          %%            The percent sign. Useful for helpers which need
                        an unchanging input format.

        In addition to the above, any string specified in the referencing
        acl will also be included in the helper request line, after the
        specified formats (see the "acl external" directive)

        The helper receives lines per the above format specification,
        and returns lines starting with OK or ERR indicating the validity
        of the request and optionally followed by additional keywords with
        more details.

        General result syntax:

          OK/ERR keyword=value ...

        Defined keywords:

          user=         The users name (login)
          password=     The users password (for login= cache_peer option)
          message=      Message describing the reason. Available as %o
                        in error pages
          tag=          Apply a tag to a request (for both ERR and OK results)
                        Only sets a tag, does not alter existing tags.
          log=          String to be logged in access.log. Available as
                        %ea in logformat specifications

        If protocol=3.0 (the default) then URL escaping is used to protect
        each value in both requests and responses.

        If using protocol=2.5 then all values need to be enclosed in quotes
        if they may contain whitespace, or the whitespace escaped using \.
        And quotes or \ characters within the keyword value must be \ escaped.

        When using the concurrency= option the protocol is changed by
        introducing a query channel tag infront of the request/response.
        The query channel tag is a number between 0 and concurrency-1.
DOC_END

NAME: acl
TYPE: acl
LOC: Config.aclList
IF USE_SSL
DEFAULT: ssl::certHasExpired ssl_error X509_V_ERR_CERT_HAS_EXPIRED
DEFAULT: ssl::certNotYetValid ssl_error X509_V_ERR_CERT_NOT_YET_VALID
DEFAULT: ssl::certDomainMismatch ssl_error SQUID_X509_V_ERR_DOMAIN_MISMATCH
DEFAULT: ssl::certUntrusted ssl_error X509_V_ERR_INVALID_CA X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY X509_V_ERR_CERT_UNTRUSTED
DEFAULT: ssl::certSelfSigned ssl_error X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT
ENDIF
DEFAULT: all src all
DEFAULT: manager url_regex -i ^cache_object:// +i ^https?://[^/]+/squid-internal-mgr/
DEFAULT: localhost src 127.0.0.1/32 ::1
DEFAULT: to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1
DEFAULT_DOC: ACLs all, manager, localhost, and to_localhost are predefined.
DOC_START
        Defining an Access List

        Every access list definition must begin with an aclname and acltype, 
        followed by either type-specific arguments or a quoted filename that
        they are read from.

           acl aclname acltype argument ...
           acl aclname acltype "file" ...

        When using "file", the file should contain one item per line.

        By default, regular expressions are CASE-SENSITIVE.
        To make them case-insensitive, use the -i option. To return case-sensitive
        use the +i option between patterns, or make a new ACL line without -i.

        Some acl types require suspending the current request in order
        to access some external data source.
        Those which do are marked with the tag [slow], those which
        don't are marked as [fast].
        See http://wiki.squid-cache.org/SquidFaq/SquidAcl
        for further information

        ***** ACL TYPES AVAILABLE *****

        acl aclname src ip-address/mask ...     # clients IP address [fast]
        acl aclname src addr1-addr2/mask ...    # range of addresses [fast]
        acl aclname dst ip-address/mask ...     # URL host's IP address [slow]
        acl aclname localip ip-address/mask ... # IP address the client connected to [fast]

        acl aclname arp      mac-address ... (xx:xx:xx:xx:xx:xx notation)
          # The arp ACL requires the special configure option --enable-arp-acl.
          # Furthermore, the ARP ACL code is not portable to all operating systems.
          # It works on Linux, Solaris, Windows, FreeBSD, and some
          # other *BSD variants.
          # [fast]
          #
          # NOTE: Squid can only determine the MAC address for clients that are on
          # the same subnet. If the client is on a different subnet,
          # then Squid cannot find out its MAC address.

        acl aclname srcdomain   .foo.com ...
          # reverse lookup, from client IP [slow]
        acl aclname dstdomain   .foo.com ...
          # Destination server from URL [fast]
        acl aclname srcdom_regex [-i] \.foo\.com ...
          # regex matching client name [slow]
        acl aclname dstdom_regex [-i] \.foo\.com ...
          # regex matching server [fast]
          #
          # For dstdomain and dstdom_regex a reverse lookup is tried if a IP
          # based URL is used and no match is found. The name "none" is used
          # if the reverse lookup fails.

        acl aclname src_as number ...
        acl aclname dst_as number ...
          # [fast]
          # Except for access control, AS numbers can be used for
          # routing of requests to specific caches. Here's an
          # example for routing all requests for AS#1241 and only
          # those to mycache.mydomain.net:
          # acl asexample dst_as 1241
          # cache_peer_access mycache.mydomain.net allow asexample
          # cache_peer_access mycache_mydomain.net deny all

        acl aclname peername myPeer ...
          # [fast]
          # match against a named cache_peer entry
          # set unique name= on cache_peer lines for reliable use.

        acl aclname time [day-abbrevs] [h1:m1-h2:m2]
          # [fast]
          #  day-abbrevs:
          #     S - Sunday
          #     M - Monday
          #     T - Tuesday
          #     W - Wednesday
          #     H - Thursday
          #     F - Friday
          #     A - Saturday
          #  h1:m1 must be less than h2:m2

        acl aclname url_regex [-i] ^http:// ...
          # regex matching on whole URL [fast]
        acl aclname urlpath_regex [-i] \.gif$ ...
          # regex matching on URL path [fast]

        acl aclname port 80 70 21 0-1024...   # destination TCP port [fast]
                                              # ranges are alloed
        acl aclname localport 3128 ...        # TCP port the client connected to [fast]
                                              # NP: for interception mode this is usually '80'

        acl aclname myportname 3128 ...       # http(s)_port name [fast]

        acl aclname proto HTTP FTP ...        # request protocol [fast]
 
        acl aclname method GET POST ...       # HTTP request method [fast]

        acl aclname http_status 200 301 500- 400-403 ... 
          # status code in reply [fast]

        acl aclname browser [-i] regexp ...
          # pattern match on User-Agent header (see also req_header below) [fast]

        acl aclname referer_regex [-i] regexp ...
          # pattern match on Referer header [fast]
          # Referer is highly unreliable, so use with care

        acl aclname ident username ...
        acl aclname ident_regex [-i] pattern ...
          # string match on ident output [slow]
          # use REQUIRED to accept any non-null ident.

        acl aclname proxy_auth [-i] username ...
        acl aclname proxy_auth_regex [-i] pattern ...
          # perform http authentication challenge to the client and match against
          # supplied credentials [slow]
          #
          # takes a list of allowed usernames.
          # use REQUIRED to accept any valid username.
          #
          # Will use proxy authentication in forward-proxy scenarios, and plain
          # http authenticaiton in reverse-proxy scenarios
          #
          # NOTE: when a Proxy-Authentication header is sent but it is not
          # needed during ACL checking the username is NOT logged
          # in access.log.
          #
          # NOTE: proxy_auth requires a EXTERNAL authentication program
          # to check username/password combinations (see
          # auth_param directive).
          #
          # NOTE: proxy_auth can't be used in a transparent/intercepting proxy
          # as the browser needs to be configured for using a proxy in order
          # to respond to proxy authentication.

        acl aclname snmp_community string ...
          # A community string to limit access to your SNMP Agent [fast]
          # Example:
          #
          #     acl snmppublic snmp_community public

        acl aclname maxconn number
          # This will be matched when the client's IP address has
          # more than <number> TCP connections established. [fast]
          # NOTE: This only measures direct TCP links so X-Forwarded-For
          # indirect clients are not counted.

        acl aclname max_user_ip [-s] number
          # This will be matched when the user attempts to log in from more
          # than <number> different ip addresses. The authenticate_ip_ttl
          # parameter controls the timeout on the ip entries. [fast]
          # If -s is specified the limit is strict, denying browsing
          # from any further IP addresses until the ttl has expired. Without
          # -s Squid will just annoy the user by "randomly" denying requests.
          # (the counter is reset each time the limit is reached and a
          # request is denied)
          # NOTE: in acceleration mode or where there is mesh of child proxies,
          # clients may appear to come from multiple addresses if they are
          # going through proxy farms, so a limit of 1 may cause user problems.

        acl aclname random probability
          # Pseudo-randomly match requests. Based on the probability given.
          # Probability may be written as a decimal (0.333), fraction (1/3)
          # or ratio of matches:non-matches (3:5).

        acl aclname req_mime_type [-i] mime-type ...
          # regex match against the mime type of the request generated
          # by the client. Can be used to detect file upload or some
          # types HTTP tunneling requests [fast]
          # NOTE: This does NOT match the reply. You cannot use this
          # to match the returned file type.

        acl aclname req_header header-name [-i] any\.regex\.here
          # regex match against any of the known request headers.  May be
          # thought of as a superset of "browser", "referer" and "mime-type"
          # ACL [fast]

        acl aclname rep_mime_type [-i] mime-type ...
          # regex match against the mime type of the reply received by
          # squid. Can be used to detect file download or some
          # types HTTP tunneling requests. [fast]
          # NOTE: This has no effect in http_access rules. It only has
          # effect in rules that affect the reply data stream such as
          # http_reply_access.

        acl aclname rep_header header-name [-i] any\.regex\.here
          # regex match against any of the known reply headers. May be
          # thought of as a superset of "browser", "referer" and "mime-type"
          # ACLs [fast]

        acl aclname external class_name [arguments...]
          # external ACL lookup via a helper class defined by the
          # external_acl_type directive [slow]

        acl aclname user_cert attribute values...
          # match against attributes in a user SSL certificate
          # attribute is one of DN/C/O/CN/L/ST [fast]

        acl aclname ca_cert attribute values...
          # match against attributes a users issuing CA SSL certificate
          # attribute is one of DN/C/O/CN/L/ST [fast]

        acl aclname ext_user username ...
        acl aclname ext_user_regex [-i] pattern ...
          # string match on username returned by external acl helper [slow]
          # use REQUIRED to accept any non-null user name.

        acl aclname tag tagvalue ...
          # string match on tag returned by external acl helper [slow]

        acl aclname hier_code codename ...
          # string match against squid hierarchy code(s); [fast]
          #  e.g., DIRECT, PARENT_HIT, NONE, etc.
          #
          # NOTE: This has no effect in http_access rules. It only has
          # effect in rules that affect the reply data stream such as
          # http_reply_access.

IF USE_SSL
        acl aclname ssl_error errorname
          # match against SSL certificate validation error [fast]
          #
          # For valid error names see in @DEFAULT_ERROR_DIR@/templates/error-details.txt
          # template file.
          #
          # The following can be used as shortcuts for certificate properties:
          #  [ssl::]certHasExpired: the "not after" field is in the past
          #  [ssl::]certNotYetValid: the "not before" field is in the future
          #  [ssl::]certUntrusted: The certificate issuer is not to be trusted.
          #  [ssl::]certSelfSigned: The certificate is self signed.
          #  [ssl::]certDomainMismatch: The certificate CN domain does not
          #         match the name the name of the host we are connecting to.
          #
          # The ssl::certHasExpired, ssl::certNotYetValid, ssl::certDomainMismatch,
          # ssl::certUntrusted, and ssl::certSelfSigned can also be used as
          # predefined ACLs, just like the 'all' ACL.
          #
          # NOTE: The ssl_error ACL is only supported with sslproxy_cert_error,
          # sslproxy_cert_sign, and sslproxy_cert_adapt options.

        acl aclname server_ssl_cert_fingerprint [-sha1] fingerprint
          # match against server SSL certificate fingerprint [fast]
          #
          # The fingerprint is the digest of the DER encoded version 
          # of the whole certificate. The user should use the form: XX:XX:...
          # Optional argument specifies the digest algorithm to use.
          # The SHA1 digest algorithm is the default and is currently
          # the only algorithm supported (-sha1).
ENDIF

        Examples:
                acl macaddress arp 09:00:2b:23:45:67
                acl myexample dst_as 1241
                acl password proxy_auth REQUIRED
                acl fileupload req_mime_type -i ^multipart/form-data$
                acl javascript rep_mime_type -i ^application/x-javascript$

NOCOMMENT_START
#
# Recommended minimum configuration:
#

# Example rule allowing access from your local networks.
# Adapt to list your (internal) IP networks from where browsing
# should be allowed
acl localnet src 10.0.0.0/8     # RFC1918 possible internal network
acl localnet src 172.16.0.0/12  # RFC1918 possible internal network
acl localnet src 192.168.0.0/16 # RFC1918 possible internal network
acl localnet src fc00::/7       # RFC 4193 local private network range
acl localnet src fe80::/10      # RFC 4291 link-local (directly plugged) machines

acl SSL_ports port 443
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443         # https
acl Safe_ports port 70          # gopher
acl Safe_ports port 210         # wais
acl Safe_ports port 1025-65535  # unregistered ports
acl Safe_ports port 280         # http-mgmt
acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http
acl CONNECT method CONNECT
NOCOMMENT_END
DOC_END

NAME: follow_x_forwarded_for
TYPE: acl_access
IFDEF: FOLLOW_X_FORWARDED_FOR
LOC: Config.accessList.followXFF
DEFAULT_IF_NONE: deny all
DOC_START
        Allowing or Denying the X-Forwarded-For header to be followed to
        find the original source of a request.

        Requests may pass through a chain of several other proxies
        before reaching us.  The X-Forwarded-For header will contain a
        comma-separated list of the IP addresses in the chain, with the
        rightmost address being the most recent.

        If a request reaches us from a source that is allowed by this
        configuration item, then we consult the X-Forwarded-For header
        to see where that host received the request from.  If the
        X-Forwarded-For header contains multiple addresses, we continue
        backtracking until we reach an address for which we are not allowed
        to follow the X-Forwarded-For header, or until we reach the first
        address in the list. For the purpose of ACL used in the
        follow_x_forwarded_for directive the src ACL type always matches
        the address we are testing and srcdomain matches its rDNS.

        The end result of this process is an IP address that we will
        refer to as the indirect client address.  This address may
        be treated as the client address for access control, ICAP, delay
        pools and logging, depending on the acl_uses_indirect_client,
        icap_uses_indirect_client, delay_pool_uses_indirect_client, 
        log_uses_indirect_client and tproxy_uses_indirect_client options.

        This clause only supports fast acl types.
        See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.

        SECURITY CONSIDERATIONS:

                Any host for which we follow the X-Forwarded-For header
                can place incorrect information in the header, and Squid
                will use the incorrect information as if it were the
                source address of the request.  This may enable remote
                hosts to bypass any access control restrictions that are
                based on the client's source addresses.

        For example:

                acl localhost src 127.0.0.1
                acl my_other_proxy srcdomain .proxy.example.com
                follow_x_forwarded_for allow localhost
                follow_x_forwarded_for allow my_other_proxy
DOC_END

NAME: acl_uses_indirect_client
COMMENT: on|off
TYPE: onoff
IFDEF: FOLLOW_X_FORWARDED_FOR
DEFAULT: on
LOC: Config.onoff.acl_uses_indirect_client
DOC_START
        Controls whether the indirect client address
        (see follow_x_forwarded_for) is used instead of the
        direct client address in acl matching.

        NOTE: maxconn ACL considers direct TCP links and indirect
              clients will always have zero. So no match.
DOC_END

NAME: delay_pool_uses_indirect_client
COMMENT: on|off
TYPE: onoff
IFDEF: FOLLOW_X_FORWARDED_FOR&&USE_DELAY_POOLS
DEFAULT: on
LOC: Config.onoff.delay_pool_uses_indirect_client
DOC_START
        Controls whether the indirect client address
        (see follow_x_forwarded_for) is used instead of the
        direct client address in delay pools.
DOC_END

NAME: log_uses_indirect_client
COMMENT: on|off
TYPE: onoff
IFDEF: FOLLOW_X_FORWARDED_FOR
DEFAULT: on
LOC: Config.onoff.log_uses_indirect_client
DOC_START
        Controls whether the indirect client address
        (see follow_x_forwarded_for) is used instead of the
        direct client address in the access log.
DOC_END

NAME: tproxy_uses_indirect_client
COMMENT: on|off
TYPE: onoff
IFDEF: FOLLOW_X_FORWARDED_FOR&&LINUX_NETFILTER
DEFAULT: off
LOC: Config.onoff.tproxy_uses_indirect_client
DOC_START
        Controls whether the indirect client address
        (see follow_x_forwarded_for) is used instead of the
        direct client address when spoofing the outgoing client.

        This has no effect on requests arriving in non-tproxy
        mode ports.

        SECURITY WARNING: Usage of this option is dangerous
        and should not be used trivially. Correct configuration
        of follow_x_forewarded_for with a limited set of trusted
        sources is required to prevent abuse of your proxy.
DOC_END

NAME: http_access
TYPE: acl_access
LOC: Config.accessList.http
DEFAULT_IF_NONE: deny all
DOC_START
        Allowing or Denying access based on defined access lists

        Access to the HTTP port:
        http_access allow|deny [!]aclname ...

        NOTE on default values:

        If there are no "access" lines present, the default is to deny
        the request.

        If none of the "access" lines cause a match, the default is the
        opposite of the last line in the list.  If the last line was
        deny, the default is allow.  Conversely, if the last line
        is allow, the default will be deny.  For these reasons, it is a
        good idea to have an "deny all" entry at the end of your access
        lists to avoid potential confusion.

        This clause supports both fast and slow acl types.
        See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.

NOCOMMENT_START

#
# Recommended minimum Access Permission configuration:
#
# Only allow cachemgr access from localhost
http_access allow localhost manager
http_access deny manager

# Deny requests to certain unsafe ports
http_access deny !Safe_ports

# Deny CONNECT to other than secure SSL ports
http_access deny CONNECT !SSL_ports

# We strongly recommend the following be uncommented to protect innocent
# web applications running on the proxy server who think the only
# one who can access services on "localhost" is a local user
#http_access deny to_localhost

#
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
#

# Example rule allowing access from your local networks.
# Adapt localnet in the ACL section to list your (internal) IP networks
# from where browsing should be allowed
http_access allow localnet
http_access allow localhost

# And finally deny all other access to this proxy
http_access deny all
NOCOMMENT_END
DOC_END

NAME: adapted_http_access http_access2
TYPE: acl_access
LOC: Config.accessList.adapted_http
DEFAULT: none
DOC_START
        Allowing or Denying access based on defined access lists

        Essentially identical to http_access, but runs after redirectors
        and ICAP/eCAP adaptation. Allowing access control based on their
        output.

        If not set then only http_access is used.
DOC_END

NAME: http_reply_access
TYPE: acl_access
LOC: Config.accessList.reply
DEFAULT: none
DOC_START
        Allow replies to client requests. This is complementary to http_access.

        http_reply_access allow|deny [!] aclname ...

        NOTE: if there are no access lines present, the default is to allow
        all replies

        If none of the access lines cause a match the opposite of the
        last line will apply. Thus it is good practice to end the rules
        with an "allow all" or "deny all" entry.

        This clause supports both fast and slow acl types.
        See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
DOC_END

NAME: icp_access
TYPE: acl_access
LOC: Config.accessList.icp
DEFAULT_IF_NONE: deny all
DOC_START
        Allowing or Denying access to the ICP port based on defined
        access lists

        icp_access  allow|deny [!]aclname ...

        See http_access for details

        This clause only supports fast acl types.
        See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.

# Allow ICP queries from local networks only
#icp_access allow localnet
#icp_access deny all
DOC_END

NAME: htcp_access
IFDEF: USE_HTCP
TYPE: acl_access
LOC: Config.accessList.htcp
DEFAULT_IF_NONE: deny all
DOC_START
        Allowing or Denying access to the HTCP port based on defined
        access lists

        htcp_access  allow|deny [!]aclname ...

        See http_access for details

        NOTE: The default if no htcp_access lines are present is to
        deny all traffic. This default may cause problems with peers
        using the htcp option.

        This clause only supports fast acl types.
        See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.

# Allow HTCP queries from local networks only
#htcp_access allow localnet
#htcp_access deny all
DOC_END

NAME: htcp_clr_access
IFDEF: USE_HTCP
TYPE: acl_access
LOC: Config.accessList.htcp_clr
DEFAULT_IF_NONE: deny all
DOC_START
        Allowing or Denying access to purge content using HTCP based
        on defined access lists

        htcp_clr_access  allow|deny [!]aclname ...

        See http_access for details

        This clause only supports fast acl types.
        See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.

# Allow HTCP CLR requests from trusted peers
acl htcp_clr_peer src 172.16.1.2
htcp_clr_access allow htcp_clr_peer
DOC_END

NAME: miss_access
TYPE: acl_access
LOC: Config.accessList.miss
DEFAULT: none
DOC_START
        Determins whether network access is permitted when satisfying a request.

        For example;
            to force your neighbors to use you as a sibling instead of
            a parent.

                acl localclients src 172.16.0.0/16
                miss_access allow localclients
                miss_access deny  !localclients

        This means only your local clients are allowed to fetch relayed/MISS
        replies from the network and all other clients can only fetch cached
        objects (HITs).


        The default for this setting allows all clients who passed the
        http_access rules to relay via this proxy.

        This clause only supports fast acl types.
        See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
DOC_END

NAME: ident_lookup_access
TYPE: acl_access
IFDEF: USE_IDENT
DEFAULT_IF_NONE: deny all
LOC: Ident::TheConfig.identLookup
DOC_START
        A list of ACL elements which, if matched, cause an ident
        (RFC 931) lookup to be performed for this request.  For
        example, you might choose to always perform ident lookups
        for your main multi-user Unix boxes, but not for your Macs
        and PCs.  By default, ident lookups are not performed for
        any requests.

        To enable ident lookups for specific client addresses, you
        can follow this example:

        acl ident_aware_hosts src 198.168.1.0/24
        ident_lookup_access allow ident_aware_hosts
        ident_lookup_access deny all

        Only src type ACL checks are fully supported.  A srcdomain
        ACL might work at times, but it will not always provide
        the correct result.

        This clause only supports fast acl types.
        See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
DOC_END

NAME: reply_body_max_size
COMMENT: size [acl acl...]
TYPE: acl_b_size_t
DEFAULT: none
LOC: Config.ReplyBodySize
DOC_START
        This option specifies the maximum size of a reply body. It can be
        used to prevent users from downloading very large files, such as
        MP3's and movies. When the reply headers are received, the
        reply_body_max_size lines are processed, and the first line where
        all (if any) listed ACLs are true is used as the maximum body size
        for this reply.

        This size is checked twice. First when we get the reply headers,
        we check the content-length value.  If the content length value exists
        and is larger than the allowed size, the request is denied and the
        user receives an error message that says "the request or reply
        is too large." If there is no content-length, and the reply
        size exceeds this limit, the client's connection is just closed
        and they will receive a partial reply.

        WARNING: downstream caches probably can not detect a partial reply
        if there is no content-length header, so they will cache
        partial responses and give them out as hits.  You should NOT
        use this option if you have downstream caches.

        WARNING: A maximum size smaller than the size of squid's error messages
        will cause an infinite loop and crash squid. Ensure that the smallest
        non-zero value you use is greater that the maximum header size plus
        the size of your largest error page.

        If you set this parameter none (the default), there will be
        no limit imposed.

        Configuration Format is:
                reply_body_max_size SIZE UNITS [acl ...]
        ie.
                reply_body_max_size 10 MB

DOC_END

COMMENT_START
 NETWORK OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: http_port ascii_port
TYPE: PortCfg
DEFAULT: none
LOC: Config.Sockaddr.http
DOC_START
        Usage:  port [mode] [options]
                hostname:port [mode] [options]
                1.2.3.4:port [mode] [options]

        The socket addresses where Squid will listen for HTTP client
        requests.  You may specify multiple socket addresses.
        There are three forms: port alone, hostname with port, and
        IP address with port.  If you specify a hostname or IP
        address, Squid binds the socket to that specific
        address. Most likely, you do not need to bind to a specific
        address, so you can use the port number alone.

        If you are running Squid in accelerator mode, you
        probably want to listen on port 80 also, or instead.

        The -a command line option may be used to specify additional
        port(s) where Squid listens for proxy request. Such ports will
        be plain proxy ports with no options.

        You may specify multiple socket addresses on multiple lines.

        Modes:

           intercept    Support for IP-Layer interception of
                        outgoing requests without browser settings.
                        NP: disables authentication and IPv6 on the port.

           tproxy       Support Linux TPROXY for spoofing outgoing
                        connections using the client IP address.
                        NP: disables authentication and maybe IPv6 on the port.

           accel        Accelerator / reverse proxy mode

           ssl-bump     For each CONNECT request allowed by ssl_bump ACLs,
                        establish secure connection with the client and with
                        the server, decrypt HTTPS messages as they pass through
                        Squid, and treat them as unencrypted HTTP messages,
                        becoming the man-in-the-middle.

                        The ssl_bump option is required to fully enable
                        bumping of CONNECT requests.

        Omitting the mode flag causes default forward proxy mode to be used.


        Accelerator Mode Options:

           defaultsite=domainname
                        What to use for the Host: header if it is not present
                        in a request. Determines what site (not origin server)
                        accelerators should consider the default.

           no-vhost     Disable using HTTP/1.1 Host header for virtual domain support.

           protocol=    Protocol to reconstruct accelerated requests with.
                        Defaults to http for http_port and https for
                        https_port

           vport        Virtual host port support. Using the http_port number
                        instead of the port passed on Host: headers.

           vport=NN     Virtual host port support. Using the specified port
                        number instead of the port passed on Host: headers.

           act-as-origin
                        Act as if this Squid is the origin server.
                        This currently means generate new Date: and Expires:
                        headers on HIT instead of adding Age:.

           ignore-cc    Ignore request Cache-Control headers.

                        WARNING: This option violates HTTP specifications if
                        used in non-accelerator setups.

           allow-direct Allow direct forwarding in accelerator mode. Normally
                        accelerated requests are denied direct forwarding as if
                        never_direct was used.

                        WARNING: this option opens accelerator mode to security
                        vulnerabilities usually only affecting in interception
                        mode. Make sure to protect forwarding with suitable
                        http_access rules when using this.


        SSL Bump Mode Options:
            In addition to these options ssl-bump requires TLS/SSL options.

           generate-host-certificates[=<on|off>]
                        Dynamically create SSL server certificates for the
                        destination hosts of bumped CONNECT requests.When 
                        enabled, the cert and key options are used to sign
                        generated certificates. Otherwise generated
                        certificate will be selfsigned.
                        If there is a CA certificate lifetime of the generated 
                        certificate equals lifetime of the CA certificate. If
                        generated certificate is selfsigned lifetime is three 
                        years.
                        This option is enabled by default when ssl-bump is used.
                        See the ssl-bump option above for more information.
                        
           dynamic_cert_mem_cache_size=SIZE
                        Approximate total RAM size spent on cached generated
                        certificates. If set to zero, caching is disabled. The
                        default value is 4MB.

        TLS / SSL Options:

           cert=        Path to SSL certificate (PEM format).

           key=         Path to SSL private key file (PEM format)
                        if not specified, the certificate file is
                        assumed to be a combined certificate and
                        key file.

           version=     The version of SSL/TLS supported
                            1   automatic (default)
                            2   SSLv2 only
                            3   SSLv3 only
                            4   TLSv1.0 only
                            5   TLSv1.1 only
                            6   TLSv1.2 only

           cipher=      Colon separated list of supported ciphers.
                        NOTE: some ciphers such as EDH ciphers depend on
                              additional settings. If those settings are
                              omitted the ciphers may be silently ignored
                              by the OpenSSL library.

           options=     Various SSL implementation options. The most important
                        being:
                            NO_SSLv2    Disallow the use of SSLv2
                            NO_SSLv3    Disallow the use of SSLv3
                            NO_TLSv1    Disallow the use of TLSv1.0
                            NO_TLSv1_1  Disallow the use of TLSv1.1
                            NO_TLSv1_2  Disallow the use of TLSv1.2
                            SINGLE_DH_USE Always create a new key when using
                                      temporary/ephemeral DH key exchanges
                            ALL       Enable various bug workarounds
                                      suggested as "harmless" by OpenSSL
                                      Be warned that this reduces SSL/TLS
                                      strength to some attacks.
                        See OpenSSL SSL_CTX_set_options documentation for a
                        complete list of options.

           clientca=    File containing the list of CAs to use when
                        requesting a client certificate.

           cafile=      File containing additional CA certificates to
                        use when verifying client certificates. If unset
                        clientca will be used.

           capath=      Directory containing additional CA certificates
                        and CRL lists to use when verifying client certificates.

           crlfile=     File of additional CRL lists to use when verifying
                        the client certificate, in addition to CRLs stored in
                        the capath. Implies VERIFY_CRL flag below.

           dhparams=    File containing DH parameters for temporary/ephemeral
                        DH key exchanges. See OpenSSL documentation for details
                        on how to create this file.
                        WARNING: EDH ciphers will be silently disabled if this
                                 option is not set.

           sslflags=    Various flags modifying the use of SSL:
                            DELAYED_AUTH
                                Don't request client certificates
                                immediately, but wait until acl processing
                                requires a certificate (not yet implemented).
                            NO_DEFAULT_CA
                                Don't use the default CA lists built in
                                to OpenSSL.
                            NO_SESSION_REUSE
                                Don't allow for session reuse. Each connection
                                will result in a new SSL session.
                            VERIFY_CRL
                                Verify CRL lists when accepting client
                                certificates.
                            VERIFY_CRL_ALL
                                Verify CRL lists for all certificates in the
                                client certificate chain.

           sslcontext=  SSL session ID context identifier.

        Other Options:

           connection-auth[=on|off]
                        use connection-auth=off to tell Squid to prevent 
                        forwarding Microsoft connection oriented authentication
                        (NTLM, Negotiate and Kerberos)

           disable-pmtu-discovery=
                        Control Path-MTU discovery usage:
                            off         lets OS decide on what to do (default).
                            transparent disable PMTU discovery when transparent
                                        support is enabled.
                            always      disable always PMTU discovery.

                        In many setups of transparently intercepting proxies
                        Path-MTU discovery can not work on traffic towards the
                        clients. This is the case when the intercepting device
                        does not fully track connections and fails to forward
                        ICMP must fragment messages to the cache server. If you
                        have such setup and experience that certain clients
                        sporadically hang or never complete requests set
                        disable-pmtu-discovery option to 'transparent'.

           name=        Specifies a internal name for the port. Defaults to
                        the port specification (port or addr:port)

           tcpkeepalive[=idle,interval,timeout]
                        Enable TCP keepalive probes of idle connections.
                        In seconds; idle is the initial time before TCP starts
                        probing the connection, interval how often to probe, and
                        timeout the time before giving up.

        If you run Squid on a dual-homed machine with an internal
        and an external interface we recommend you to specify the
        internal address:port in http_port. This way Squid will only be
        visible on the internal address.

NOCOMMENT_START

# Squid normally listens to port 3128
http_port @DEFAULT_HTTP_PORT@
NOCOMMENT_END
DOC_END

NAME: https_port
IFDEF: USE_SSL
TYPE: PortCfg
DEFAULT: none
LOC: Config.Sockaddr.https
DOC_START
        Usage:  [ip:]port cert=certificate.pem [key=key.pem] [mode] [options...]

        The socket address where Squid will listen for client requests made
        over TLS or SSL connections. Commonly referred to as HTTPS.

        This is most useful for situations where you are running squid in
        accelerator mode and you want to do the SSL work at the accelerator level.

        You may specify multiple socket addresses on multiple lines,
        each with their own SSL certificate and/or options.

        Modes:

           accel        Accelerator / reverse proxy mode

           intercept    Support for IP-Layer interception of
                        outgoing requests without browser settings.
                        NP: disables authentication and IPv6 on the port.

           tproxy       Support Linux TPROXY for spoofing outgoing
                        connections using the client IP address.
                        NP: disables authentication and maybe IPv6 on the port.

           ssl-bump     For each intercepted connection allowed by ssl_bump
                        ACLs, establish a secure connection with the client and with
                        the server, decrypt HTTPS messages as they pass through
                        Squid, and treat them as unencrypted HTTP messages,
                        becoming the man-in-the-middle.

                        An "ssl_bump server-first" match is required to
                        fully enable bumping of intercepted SSL connections.

                        Requires tproxy or intercept.

        Omitting the mode flag causes default forward proxy mode to be used.


        See http_port for a list of generic options


        SSL Options:

           cert=        Path to SSL certificate (PEM format).

           key=         Path to SSL private key file (PEM format)
                        if not specified, the certificate file is
                        assumed to be a combined certificate and
                        key file.

           version=     The version of SSL/TLS supported
                            1   automatic (default)
                            2   SSLv2 only
                            3   SSLv3 only
                            4   TLSv1 only

           cipher=      Colon separated list of supported ciphers.

           options=     Various SSL engine options. The most important
                        being:
                            NO_SSLv2  Disallow the use of SSLv2
                            NO_SSLv3  Disallow the use of SSLv3
                            NO_TLSv1  Disallow the use of TLSv1
                            SINGLE_DH_USE Always create a new key when using
                                      temporary/ephemeral DH key exchanges
                        See src/ssl_support.c or OpenSSL SSL_CTX_set_options
                        documentation for a complete list of options.

           clientca=    File containing the list of CAs to use when
                        requesting a client certificate.

           cafile=      File containing additional CA certificates to
                        use when verifying client certificates. If unset
                        clientca will be used.

           capath=      Directory containing additional CA certificates
                        and CRL lists to use when verifying client certificates.

           crlfile=     File of additional CRL lists to use when verifying
                        the client certificate, in addition to CRLs stored in
                        the capath. Implies VERIFY_CRL flag below.

           dhparams=    File containing DH parameters for temporary/ephemeral
                        DH key exchanges.

           sslflags=    Various flags modifying the use of SSL:
                            DELAYED_AUTH
                                Don't request client certificates
                                immediately, but wait until acl processing
                                requires a certificate (not yet implemented).
                            NO_DEFAULT_CA
                                Don't use the default CA lists built in
                                to OpenSSL.
                            NO_SESSION_REUSE
                                Don't allow for session reuse. Each connection
                                will result in a new SSL session.
                            VERIFY_CRL
                                Verify CRL lists when accepting client
                                certificates.
                            VERIFY_CRL_ALL
                                Verify CRL lists for all certificates in the
                                client certificate chain.

           sslcontext=  SSL session ID context identifier.

           generate-host-certificates[=<on|off>]
                        Dynamically create SSL server certificates for the
                        destination hosts of bumped SSL requests.When
                        enabled, the cert and key options are used to sign
                        generated certificates. Otherwise generated
                        certificate will be selfsigned.
                        If there is CA certificate life time of generated
                        certificate equals lifetime of CA certificate. If
                        generated certificate is selfsigned lifetime is three
                        years.
                        This option is enabled by default when SslBump is used.
                        See the sslBump option above for more information.

           dynamic_cert_mem_cache_size=SIZE
                        Approximate total RAM size spent on cached generated
                        certificates. If set to zero, caching is disabled. The
                        default value is 4MB.

        See http_port for a list of available options.
DOC_END

NAME: tcp_outgoing_tos tcp_outgoing_ds tcp_outgoing_dscp
TYPE: acl_tos
DEFAULT: none
LOC: Ip::Qos::TheConfig.tosToServer
DOC_START
        Allows you to select a TOS/Diffserv value for packets outgoing
        on the server side, based on an ACL.

        tcp_outgoing_tos ds-field [!]aclname ...

        Example where normal_service_net uses the TOS value 0x00
        and good_service_net uses 0x20

        acl normal_service_net src 10.0.0.0/24
        acl good_service_net src 10.0.1.0/24
        tcp_outgoing_tos 0x00 normal_service_net
        tcp_outgoing_tos 0x20 good_service_net

        TOS/DSCP values really only have local significance - so you should
        know what you're specifying. For more information, see RFC2474,
        RFC2475, and RFC3260.

        The TOS/DSCP byte must be exactly that - a octet value  0 - 255, or
        "default" to use whatever default your host has. Note that in
        practice often only multiples of 4 is usable as the two rightmost bits
        have been redefined for use by ECN (RFC 3168 section 23.1).

        Processing proceeds in the order specified, and stops at first fully
        matching line.
DOC_END

NAME: clientside_tos
TYPE: acl_tos
DEFAULT: none
LOC: Ip::Qos::TheConfig.tosToClient
DOC_START
        Allows you to select a TOS/Diffserv value for packets being transmitted
        on the client-side, based on an ACL.

        clientside_tos ds-field [!]aclname ...

        Example where normal_service_net uses the TOS value 0x00
        and good_service_net uses 0x20

        acl normal_service_net src 10.0.0.0/24
        acl good_service_net src 10.0.1.0/24
        clientside_tos 0x00 normal_service_net
        clientside_tos 0x20 good_service_net

        Note: This feature is incompatible with qos_flows. Any TOS values set here
        will be overwritten by TOS values in qos_flows.
DOC_END

NAME: tcp_outgoing_mark
TYPE: acl_nfmark
IFDEF: SO_MARK&&USE_LIBCAP
DEFAULT: none
LOC: Ip::Qos::TheConfig.nfmarkToServer
DOC_START
        Allows you to apply a Netfilter mark value to outgoing packets
        on the server side, based on an ACL.

        tcp_outgoing_mark mark-value [!]aclname ...

        Example where normal_service_net uses the mark value 0x00
        and good_service_net uses 0x20

        acl normal_service_net src 10.0.0.0/24
        acl good_service_net src 10.0.1.0/24
        tcp_outgoing_mark 0x00 normal_service_net
        tcp_outgoing_mark 0x20 good_service_net
DOC_END

NAME: clientside_mark
TYPE: acl_nfmark
IFDEF: SO_MARK&&USE_LIBCAP
DEFAULT: none
LOC: Ip::Qos::TheConfig.nfmarkToClient
DOC_START
        Allows you to apply a Netfilter mark value to packets being transmitted
        on the client-side, based on an ACL.

        clientside_mark mark-value [!]aclname ...

        Example where normal_service_net uses the mark value 0x00
        and good_service_net uses 0x20

        acl normal_service_net src 10.0.0.0/24
        acl good_service_net src 10.0.1.0/24
        clientside_mark 0x00 normal_service_net
        clientside_mark 0x20 good_service_net

        Note: This feature is incompatible with qos_flows. Any mark values set here
        will be overwritten by mark values in qos_flows.
DOC_END

NAME: qos_flows
TYPE: QosConfig
IFDEF: USE_QOS_TOS
DEFAULT: none
LOC: Ip::Qos::TheConfig
DOC_START
        Allows you to select a TOS/DSCP value to mark outgoing
        connections with, based on where the reply was sourced. For
        platforms using netfilter, allows you to set a netfilter mark
        value instead of, or in addition to, a TOS value.

        TOS values really only have local significance - so you should
        know what you're specifying. For more information, see RFC2474,
        RFC2475, and RFC3260.

        The TOS/DSCP byte must be exactly that - a octet value  0 - 255. Note that
        in practice often only multiples of 4 is usable as the two rightmost bits
        have been redefined for use by ECN (RFC 3168 section 23.1).

        Mark values can be any unsigned 32-bit integer value.

        This setting is configured by setting the following values:

        tos|mark                Whether to set TOS or netfilter mark values

        local-hit=0xFF          Value to mark local cache hits.

        sibling-hit=0xFF        Value to mark hits from sibling peers.

        parent-hit=0xFF         Value to mark hits from parent peers.

        miss=0xFF[/mask]        Value to mark cache misses. Takes precedence
                                over the preserve-miss feature (see below), unless
                                mask is specified, in which case only the bits
                                specified in the mask are written.

        The TOS variant of the following features are only possible on Linux
        and require your kernel to be patched with the TOS preserving ZPH
        patch, available from http://zph.bratcheda.org
        No patch is needed to preserve the netfilter mark, which will work
        with all variants of netfilter.

        disable-preserve-miss
                This option disables the preservation of the TOS or netfilter
                mark. By default, the existing TOS or netfilter mark value of
                the response coming from the remote server will be retained
                and masked with miss-mark.
                NOTE: in the case of a netfilter mark, the mark must be set on
                the connection (using the CONNMARK target) not on the packet
                (MARK target).

        miss-mask=0xFF
                Allows you to mask certain bits in the TOS or mark value
                received from the remote server, before copying the value to
                the TOS sent towards clients.
                Default for tos: 0xFF (TOS from server is not changed).
                Default for mark: 0xFFFFFFFF (mark from server is not changed).

        All of these features require the --enable-zph-qos compilation flag
        (enabled by default). Netfilter marking also requires the
        libnetfilter_conntrack libraries (--with-netfilter-conntrack) and
        libcap 2.09+ (--with-libcap).

DOC_END

NAME: tcp_outgoing_address
TYPE: acl_address
DEFAULT: none
LOC: Config.accessList.outgoing_address
DOC_START
        Allows you to map requests to different outgoing IP addresses
        based on the username or source address of the user making
        the request.

        tcp_outgoing_address ipaddr [[!]aclname] ...

        For example;
                Forwarding clients with dedicated IPs for certain subnets.

          acl normal_service_net src 10.0.0.0/24
          acl good_service_net src 10.0.2.0/24

          tcp_outgoing_address 2001:db8::c001 good_service_net
          tcp_outgoing_address 10.1.0.2 good_service_net

          tcp_outgoing_address 2001:db8::beef normal_service_net
          tcp_outgoing_address 10.1.0.1 normal_service_net

          tcp_outgoing_address 2001:db8::1
          tcp_outgoing_address 10.1.0.3

        Processing proceeds in the order specified, and stops at first fully
        matching line.

        Squid will add an implicit IP version test to each line.
        Requests going to IPv4 websites will use the outgoing 10.1.0.* addresses.
        Requests going to IPv6 websites will use the outgoing 2001:db8:* addresses.


        NOTE: The use of this directive using client dependent ACLs is
        incompatible with the use of server side persistent connections. To
        ensure correct results it is best to set server_persistent_connections
        to off when using this directive in such configurations.

        NOTE: The use of this directive to set a local IP on outgoing TCP links
        is incompatible with using TPROXY to set client IP out outbound TCP links.
        When needing to contact peers use the no-tproxy cache_peer option and the
        client_dst_passthru directive re-enable normal forwarding such as this.

DOC_END

NAME: host_verify_strict
TYPE: onoff
DEFAULT: off
LOC: Config.onoff.hostStrictVerify
DOC_START
        Regardless of this option setting, when dealing with intercepted
        traffic, Squid always verifies that the destination IP address matches
        the Host header domain or IP (called 'authority form URL').
        
        This enforcement is performed to satisfy a MUST-level requirement in
        RFC 2616 section 14.23: "The Host field value MUST represent the naming
        authority of the origin server or gateway given by the original URL".
        
        When set to ON:
                Squid always responds with an HTTP 409 (Conflict) error
                page and logs a security warning if there is no match.
        
                Squid verifies that the destination IP address matches
                the Host header for forward-proxy and reverse-proxy traffic
                as well. For those traffic types, Squid also enables the
                following checks, comparing the corresponding Host header
                and Request-URI components:
        
                 * The host names (domain or IP) must be identical,
                   but valueless or missing Host header disables all checks.
                   For the two host names to match, both must be either IP
                   or FQDN.
        
                 * Port numbers must be identical, but if a port is missing
                   the scheme-default port is assumed.
        
        
        When set to OFF (the default):
                Squid allows suspicious requests to continue but logs a
                security warning and blocks caching of the response.
        
                 * Forward-proxy traffic is not checked at all.
        
                 * Reverse-proxy traffic is not checked at all.
        
                 * Intercepted traffic which passes verification is handled
                   according to client_dst_passthru.
        
                 * Intercepted requests which fail verification are sent
                   to the client original destination instead of DIRECT.
                   This overrides 'client_dst_passthru off'.
        
                For now suspicious intercepted CONNECT requests are always
                responded to with an HTTP 409 (Conflict) error page.
        
        
        SECURITY NOTE:
        
        As described in CVE-2009-0801 when the Host: header alone is used
        to determine the destination of a request it becomes trivial for
        malicious scripts on remote websites to bypass browser same-origin
        security policy and sandboxing protections.
        
        The cause of this is that such applets are allowed to perform their
        own HTTP stack, in which case the same-origin policy of the browser
        sandbox only verifies that the applet tries to contact the same IP
        as from where it was loaded at the IP level. The Host: header may
        be different from the connected IP and approved origin.
        
DOC_END

NAME: client_dst_passthru
TYPE: onoff
DEFAULT: on
LOC: Config.onoff.client_dst_passthru
DOC_START
        With NAT or TPROXY intercepted traffic Squid may pass the request
        directly to the original client destination IP or seek a faster
        source using the HTTP Host header.
        
        Using Host to locate alternative servers can provide faster
        connectivity with a range of failure recovery options.
        But can also lead to connectivity trouble when the client and
        server are attempting stateful interactions unaware of the proxy.
        
        This option (on by default) prevents alternative DNS entries being
        located to send intercepted traffic DIRECT to an origin server.
        The clients original destination IP and port will be used instead.
        
        Regardless of this option setting, when dealing with intercepted
        traffic Squid will verify the Host: header and any traffic which
        fails Host verification will be treated as if this option were ON.
        
        see host_verify_strict for details on the verification process.
DOC_END

COMMENT_START
 SSL OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: ssl_unclean_shutdown
IFDEF: USE_SSL
TYPE: onoff
DEFAULT: off
LOC: Config.SSL.unclean_shutdown
DOC_START
        Some browsers (especially MSIE) bugs out on SSL shutdown
        messages.
DOC_END

NAME: ssl_engine
IFDEF: USE_SSL
TYPE: string
LOC: Config.SSL.ssl_engine
DEFAULT: none
DOC_START
        The OpenSSL engine to use. You will need to set this if you
        would like to use hardware SSL acceleration for example.
DOC_END

NAME: sslproxy_client_certificate
IFDEF: USE_SSL
DEFAULT: none
LOC: Config.ssl_client.cert
TYPE: string
DOC_START
        Client SSL Certificate to use when proxying https:// URLs
DOC_END

NAME: sslproxy_client_key
IFDEF: USE_SSL
DEFAULT: none
LOC: Config.ssl_client.key
TYPE: string
DOC_START
        Client SSL Key to use when proxying https:// URLs
DOC_END

NAME: sslproxy_version
IFDEF: USE_SSL
DEFAULT: 1
LOC: Config.ssl_client.version
TYPE: int
DOC_START
        SSL version level to use when proxying https:// URLs

        The versions of SSL/TLS supported:

            1   automatic (default)
            2   SSLv2 only
            3   SSLv3 only
            4   TLSv1.0 only
            5   TLSv1.1 only
            6   TLSv1.2 only
DOC_END

NAME: sslproxy_options
IFDEF: USE_SSL
DEFAULT: none
LOC: Config.ssl_client.options
TYPE: string
DOC_START
        SSL implementation options to use when proxying https:// URLs
        
        The most important being:

            NO_SSLv2    Disallow the use of SSLv2
            NO_SSLv3    Disallow the use of SSLv3
            NO_TLSv1    Disallow the use of TLSv1.0
            NO_TLSv1_1  Disallow the use of TLSv1.1
            NO_TLSv1_2  Disallow the use of TLSv1.2
            SINGLE_DH_USE
                      Always create a new key when using temporary/ephemeral
                      DH key exchanges
            SSL_OP_NO_TICKET
                      Disable use of RFC5077 session tickets. Some servers
                      may have problems understanding the TLS extension due
                      to ambiguous specification in RFC4507.
            ALL       Enable various bug workarounds suggested as "harmless"
                      by OpenSSL. Be warned that this may reduce SSL/TLS
                      strength to some attacks.
        
        See the OpenSSL SSL_CTX_set_options documentation for a
        complete list of possible options.
DOC_END

NAME: sslproxy_cipher
IFDEF: USE_SSL
DEFAULT: none
LOC: Config.ssl_client.cipher
TYPE: string
DOC_START
        SSL cipher list to use when proxying https:// URLs

        Colon separated list of supported ciphers.
DOC_END

NAME: sslproxy_cafile
IFDEF: USE_SSL
DEFAULT: none
LOC: Config.ssl_client.cafile
TYPE: string
DOC_START
        file containing CA certificates to use when verifying server
        certificates while proxying https:// URLs
DOC_END

NAME: sslproxy_capath
IFDEF: USE_SSL
DEFAULT: none
LOC: Config.ssl_client.capath
TYPE: string
DOC_START
        directory containing CA certificates to use when verifying
        server certificates while proxying https:// URLs
DOC_END

NAME: ssl_bump
IFDEF: USE_SSL
TYPE: sslproxy_ssl_bump
LOC: Config.accessList.ssl_bump
DEFAULT: none
DOC_START
        This option is consulted when a CONNECT request is received on
        an http_port (or a new connection is intercepted at an
        https_port), provided that port was configured with an ssl-bump
        flag. The subsequent data on the connection is either treated as
        HTTPS and decrypted OR tunneled at TCP level without decryption,
        depending on the first bumping "mode" which ACLs match.

        ssl_bump <mode> [!]acl ...

        The following bumping modes are supported:

            client-first
                Allow bumping of the connection. Establish a secure connection
                with the client first, then connect to the server. This old mode
                does not allow Squid to mimic server SSL certificate and does
                not work with intercepted SSL connections.

            server-first
                Allow bumping of the connection. Establish a secure connection
                with the server first, then establish a secure connection with
                the client, using a mimicked server certificate. Works with both
                CONNECT requests and intercepted SSL connections.

            none
                Become a TCP tunnel without decoding the connection.
                Works with both CONNECT requests and intercepted SSL
                connections. This is the default behavior when no
                ssl_bump option is given or no ssl_bump ACLs match.

        By default, no connections are bumped.

        The first matching ssl_bump option wins. If no ACLs match, the
        connection is not bumped. Unlike most allow/deny ACL lists, ssl_bump
        does not have an implicit "negate the last given option" rule. You
        must make that rule explicit if you convert old ssl_bump allow/deny
        rules that rely on such an implicit rule.

        This clause supports both fast and slow acl types.
        See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.

        See also: http_port ssl-bump, https_port ssl-bump


        # Example: Bump all requests except those originating from
        # localhost and those going to example.com.

        acl broken_sites dstdomain .example.com
        ssl_bump none localhost
        ssl_bump none broken_sites
        ssl_bump server-first all
DOC_END

NAME: sslproxy_flags
IFDEF: USE_SSL
DEFAULT: none
LOC: Config.ssl_client.flags
TYPE: string
DOC_START
        Various flags modifying the use of SSL while proxying https:// URLs:
            DONT_VERIFY_PEER    Accept certificates that fail verification.
                                For refined control, see sslproxy_cert_error.
            NO_DEFAULT_CA       Don't use the default CA list built in
                                to OpenSSL.
DOC_END

NAME: sslproxy_cert_error
IFDEF: USE_SSL
DEFAULT: none
LOC: Config.ssl_client.cert_error
TYPE: acl_access
DOC_START
        Use this ACL to bypass server certificate validation errors.

        For example, the following lines will bypass all validation errors
        when talking to servers for example.com. All other
        validation errors will result in ERR_SECURE_CONNECT_FAIL error.

                acl BrokenButTrustedServers dstdomain example.com
                sslproxy_cert_error allow BrokenButTrustedServers
                sslproxy_cert_error deny all

        This clause only supports fast acl types.
        See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
        Using slow acl types may result in server crashes

        Without this option, all server certificate validation errors
        terminate the transaction. Bypassing validation errors is dangerous
        because an error usually implies that the server cannot be trusted and
        the connection may be insecure.

        See also: sslproxy_flags and DONT_VERIFY_PEER.

        Default setting:  sslproxy_cert_error deny all
DOC_END

NAME: sslproxy_cert_sign
IFDEF: USE_SSL
DEFAULT: none
POSTSCRIPTUM: signUntrusted ssl::certUntrusted
POSTSCRIPTUM: signSelf ssl::certSelfSigned
POSTSCRIPTUM: signTrusted all
TYPE: sslproxy_cert_sign
LOC: Config.ssl_client.cert_sign
DOC_START

        sslproxy_cert_sign <signing algorithm> acl ...

        The following certificate signing algorithms are supported:
           signTrusted
                Sign using the configured CA certificate which is usually
                placed in and trusted by end-user browsers. This is the
                default for trusted origin server certificates.
           signUntrusted
                Sign to guarantee an X509_V_ERR_CERT_UNTRUSTED browser error.
                This is the default for untrusted origin server certificates
                that are not self-signed (see ssl::certUntrusted).
           signSelf
                Sign using a self-signed certificate with the right CN to
                generate a X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT error in the
                browser. This is the default for self-signed origin server
                certificates (see ssl::certSelfSigned).

        This clause only supports fast acl types.

        When sslproxy_cert_sign acl(s) match, Squid uses the corresponding
        signing algorithm to generate the certificate and ignores all
        subsequent sslproxy_cert_sign options (the first match wins). If no
        acl(s) match, the default signing algorithm is determined by errors
        detected when obtaining and validating the origin server certificate.

        WARNING: SQUID_X509_V_ERR_DOMAIN_MISMATCH and ssl:certDomainMismatch can
        be used with sslproxy_cert_adapt, but if and only if Squid is bumping a
        CONNECT request that carries a domain name. In all other cases (CONNECT
        to an IP address or an intercepted SSL connection), Squid cannot detect
        the domain mismatch at certificate generation time when
        bump-server-first is used.
DOC_END

NAME: sslproxy_cert_adapt 
IFDEF: USE_SSL
DEFAULT: none
TYPE: sslproxy_cert_adapt
LOC: Config.ssl_client.cert_adapt
DOC_START
        
        sslproxy_cert_adapt <adaptation algorithm> acl ...

        The following certificate adaptation algorithms are supported:
           setValidAfter
                Sets the "Not After" property to the "Not After" property of
                the CA certificate used to sign generated certificates.
           setValidBefore
                Sets the "Not Before" property to the "Not Before" property of
                the CA certificate used to sign generated certificates.
           setCommonName or setCommonName{CN}
                Sets Subject.CN property to the host name specified as a 
                CN parameter or, if no explicit CN parameter was specified,
                extracted from the CONNECT request. It is a misconfiguration
                to use setCommonName without an explicit parameter for
                intercepted or tproxied SSL connections.
                
        This clause only supports fast acl types.

        Squid first groups sslproxy_cert_adapt options by adaptation algorithm.
        Within a group, when sslproxy_cert_adapt acl(s) match, Squid uses the
        corresponding adaptation algorithm to generate the certificate and
        ignores all subsequent sslproxy_cert_adapt options in that algorithm's
        group (i.e., the first match wins within each algorithm group). If no
        acl(s) match, the default mimicking action takes place.

        WARNING: SQUID_X509_V_ERR_DOMAIN_MISMATCH and ssl:certDomainMismatch can
        be used with sslproxy_cert_adapt, but if and only if Squid is bumping a
        CONNECT request that carries a domain name. In all other cases (CONNECT
        to an IP address or an intercepted SSL connection), Squid cannot detect
        the domain mismatch at certificate generation time when
        bump-server-first is used.
DOC_END

NAME: sslpassword_program
IFDEF: USE_SSL
DEFAULT: none
LOC: Config.Program.ssl_password
TYPE: string
DOC_START
        Specify a program used for entering SSL key passphrases
        when using encrypted SSL certificate keys. If not specified
        keys must either be unencrypted, or Squid started with the -N
        option to allow it to query interactively for the passphrase.

        The key file name is given as argument to the program allowing
        selection of the right password if you have multiple encrypted
        keys.
DOC_END

COMMENT_START
 OPTIONS RELATING TO EXTERNAL SSL_CRTD 
 -----------------------------------------------------------------------------
COMMENT_END

NAME: sslcrtd_program
TYPE: eol 
IFDEF: USE_SSL_CRTD
DEFAULT: @DEFAULT_SSL_CRTD@ -s @DEFAULT_SSL_DB_DIR@ -M 4MB
LOC: Ssl::TheConfig.ssl_crtd
DOC_START
        Specify the location and options of the executable for ssl_crtd process.
        @DEFAULT_SSL_CRTD@ program requires -s and -M parameters
        For more information use:
                @DEFAULT_SSL_CRTD@ -h
DOC_END

NAME: sslcrtd_children
TYPE: HelperChildConfig
IFDEF: USE_SSL_CRTD
DEFAULT: 32 startup=5 idle=1
LOC: Ssl::TheConfig.ssl_crtdChildren
DOC_START
        The maximum number of processes spawn to service ssl server.
        The maximum this may be safely set to is 32.
        
        The startup= and idle= options allow some measure of skew in your
        tuning.
        
                startup=N
        
        Sets the minimum number of processes to spawn when Squid
        starts or reconfigures. When set to zero the first request will
        cause spawning of the first child process to handle it.
        
        Starting too few children temporary slows Squid under load while it
        tries to spawn enough additional processes to cope with traffic.
        
                idle=N
        
        Sets a minimum of how many processes Squid is to try and keep available
        at all times. When traffic begins to rise above what the existing
        processes can handle this many more will be spawned up to the maximum
        configured. A minimum setting of 1 is required.
        
        You must have at least one ssl_crtd process.
DOC_END

NAME: sslcrtvalidator_program
TYPE: eol
IFDEF: USE_SSL
DEFAULT: none
LOC: Ssl::TheConfig.ssl_crt_validator
DOC_START
        Specify the location and options of the executable for ssl_crt_validator
        process.
DOC_END

NAME: sslcrtvalidator_children
TYPE: HelperChildConfig
IFDEF: USE_SSL
DEFAULT: 32 startup=5 idle=1
LOC: Ssl::TheConfig.ssl_crt_validator_Children
DOC_START
        The maximum number of processes spawn to service ssl server.
        The maximum this may be safely set to is 32.
        
        The startup= and idle= options allow some measure of skew in your
        tuning.
        
                startup=N
        
        Sets the minimum number of processes to spawn when Squid
        starts or reconfigures. When set to zero the first request will
        cause spawning of the first child process to handle it.
        
        Starting too few children temporary slows Squid under load while it
        tries to spawn enough additional processes to cope with traffic.
        
                idle=N
        
        Sets a minimum of how many processes Squid is to try and keep available
        at all times. When traffic begins to rise above what the existing
        processes can handle this many more will be spawned up to the maximum
        configured. A minimum setting of 1 is required.
        
        You must have at least one ssl_crt_validator process.
DOC_END

COMMENT_START
 OPTIONS WHICH AFFECT THE NEIGHBOR SELECTION ALGORITHM
 -----------------------------------------------------------------------------
COMMENT_END

NAME: cache_peer
TYPE: peer
DEFAULT: none
LOC: Config.peers
DOC_START
        To specify other caches in a hierarchy, use the format:
        
                cache_peer hostname type http-port icp-port [options]
        
        For example,
        
        #                                        proxy  icp
        #          hostname             type     port   port  options
        #          -------------------- -------- ----- -----  -----------
        cache_peer parent.foo.net       parent    3128  3130  default
        cache_peer sib1.foo.net         sibling   3128  3130  proxy-only
        cache_peer sib2.foo.net         sibling   3128  3130  proxy-only
        cache_peer example.com          parent    80       0  default
        cache_peer cdn.example.com      sibling   3128     0  
        
              type:     either 'parent', 'sibling', or 'multicast'.
        
        proxy-port:     The port number where the peer accept HTTP requests.
                        For other Squid proxies this is usually 3128
                        For web servers this is usually 80
        
          icp-port:     Used for querying neighbor caches about objects.
                        Set to 0 if the peer does not support ICP or HTCP.
                        See ICP and HTCP options below for additional details.
        
        
        ==== ICP OPTIONS ====
        
        You MUST also set icp_port and icp_access explicitly when using these options.
        The defaults will prevent peer traffic using ICP.
        
        
        no-query        Disable ICP queries to this neighbor.
        
        multicast-responder
                        Indicates the named peer is a member of a multicast group.
                        ICP queries will not be sent directly to the peer, but ICP
                        replies will be accepted from it.
        
        closest-only    Indicates that, for ICP_OP_MISS replies, we'll only forward
                        CLOSEST_PARENT_MISSes and never FIRST_PARENT_MISSes.
        
        background-ping
                        To only send ICP queries to this neighbor infrequently.
                        This is used to keep the neighbor round trip time updated
                        and is usually used in conjunction with weighted-round-robin.
        
        
        ==== HTCP OPTIONS ====
        
        You MUST also set htcp_port and htcp_access explicitly when using these options.
        The defaults will prevent peer traffic using HTCP.
        
        
        htcp            Send HTCP, instead of ICP, queries to the neighbor.
                        You probably also want to set the "icp-port" to 4827
                        instead of 3130. This directive accepts a comma separated
                        list of options described below.
        
        htcp=oldsquid   Send HTCP to old Squid versions (2.5 or earlier).
        
        htcp=no-clr     Send HTCP to the neighbor but without
                        sending any CLR requests.  This cannot be used with
                        only-clr.
        
        htcp=only-clr   Send HTCP to the neighbor but ONLY CLR requests.
                        This cannot be used with no-clr.
        
        htcp=no-purge-clr
                        Send HTCP to the neighbor including CLRs but only when
                        they do not result from PURGE requests.
        
        htcp=forward-clr
                        Forward any HTCP CLR requests this proxy receives to the peer.
        
        
        ==== PEER SELECTION METHODS ====
        
        The default peer selection method is ICP, with the first responding peer
        being used as source. These options can be used for better load balancing.
        
        
        default         This is a parent cache which can be used as a "last-resort"
                        if a peer cannot be located by any of the peer-selection methods.
                        If specified more than once, only the first is used.
        
        round-robin     Load-Balance parents which should be used in a round-robin
                        fashion in the absence of any ICP queries.
                        weight=N can be used to add bias.
        
        weighted-round-robin
                        Load-Balance parents which should be used in a round-robin
                        fashion with the frequency of each parent being based on the
                        round trip time. Closer parents are used more often.
                        Usually used for background-ping parents.
                        weight=N can be used to add bias.
        
        carp            Load-Balance parents which should be used as a CARP array.
                        The requests will be distributed among the parents based on the
                        CARP load balancing hash function based on their weight.
        
        userhash        Load-balance parents based on the client proxy_auth or ident username.
        
        sourcehash      Load-balance parents based on the client source IP.

        multicast-siblings
                        To be used only for cache peers of type "multicast".
                        ALL members of this multicast group have "sibling"
                        relationship with it, not "parent".  This is to a multicast
                        group when the requested object would be fetched only from
                        a "parent" cache, anyway.  It's useful, e.g., when
                        configuring a pool of redundant Squid proxies, being
                        members of the same multicast group.
        
        
        ==== PEER SELECTION OPTIONS ====
        
        weight=N        use to affect the selection of a peer during any weighted
                        peer-selection mechanisms.
                        The weight must be an integer; default is 1,
                        larger weights are favored more.
                        This option does not affect parent selection if a peering
                        protocol is not in use.
        
        basetime=N      Specify a base amount to be subtracted from round trip
                        times of parents.
                        It is subtracted before division by weight in calculating
                        which parent to fectch from. If the rtt is less than the
                        base time the rtt is set to a minimal value.
        
        ttl=N           Specify a TTL to use when sending multicast ICP queries
                        to this address.
                        Only useful when sending to a multicast group.
                        Because we don't accept ICP replies from random
                        hosts, you must configure other group members as
                        peers with the 'multicast-responder' option.
        
        no-delay        To prevent access to this neighbor from influencing the
                        delay pools.
        
        digest-url=URL  Tell Squid to fetch the cache digest (if digests are
                        enabled) for this host from the specified URL rather
                        than the Squid default location.
        
        
        ==== CARP OPTIONS ====
        
        carp-key=key-specification
                        use a different key than the full URL to hash against the peer.
                        the key-specification is a comma-separated list of the keywords                 
                        scheme, host, port, path, params
                        Order is not important.
        
        ==== ACCELERATOR / REVERSE-PROXY OPTIONS ====
        
        originserver    Causes this parent to be contacted as an origin server.
                        Meant to be used in accelerator setups when the peer
                        is a web server.
        
        forceddomain=name
                        Set the Host header of requests forwarded to this peer.
                        Useful in accelerator setups where the server (peer)
                        expects a certain domain name but clients may request
                        others. ie example.com or www.example.com
        
        no-digest       Disable request of cache digests.
        
        no-netdb-exchange
                        Disables requesting ICMP RTT database (NetDB).
        
        
        ==== AUTHENTICATION OPTIONS ====
        
        login=user:password
                        If this is a personal/workgroup proxy and your parent
                        requires proxy authentication.
                        
                        Note: The string can include URL escapes (i.e. %20 for
                        spaces). This also means % must be written as %%.
        
        login=PASSTHRU
                        Send login details received from client to this peer.
                        Both Proxy- and WWW-Authorization headers are passed
                        without alteration to the peer.
                        Authentication is not required by Squid for this to work.
                        
                        Note: This will pass any form of authentication but
                        only Basic auth will work through a proxy unless the
                        connection-auth options are also used.

        login=PASS      Send login details received from client to this peer.
                        Authentication is not required by this option.
                        
                        If there are no client-provided authentication headers
                        to pass on, but username and password are available
                        from an external ACL user= and password= result tags
                        they may be sent instead.
                        
                        Note: To combine this with proxy_auth both proxies must
                        share the same user database as HTTP only allows for
                        a single login (one for proxy, one for origin server).
                        Also be warned this will expose your users proxy
                        password to the peer. USE WITH CAUTION
        
        login=*:password
                        Send the username to the upstream cache, but with a
                        fixed password. This is meant to be used when the peer
                        is in another administrative domain, but it is still
                        needed to identify each user.
                        The star can optionally be followed by some extra
                        information which is added to the username. This can
                        be used to identify this proxy to the peer, similar to
                        the login=username:password option above.
        
        login=NEGOTIATE
                        If this is a personal/workgroup proxy and your parent
                        requires a secure proxy authentication.
                        The first principal from the default keytab or defined by
                        the environment variable KRB5_KTNAME will be used. 
        
                        WARNING: The connection may transmit requests from multiple
                        clients. Negotiate often assumes end-to-end authentication
                        and a single-client. Which is not strictly true here.
        
        login=NEGOTIATE:principal_name
                        If this is a personal/workgroup proxy and your parent
                        requires a secure proxy authentication. 
                        The principal principal_name from the default keytab or
                        defined by the environment variable KRB5_KTNAME will be
                        used.
        
                        WARNING: The connection may transmit requests from multiple
                        clients. Negotiate often assumes end-to-end authentication
                        and a single-client. Which is not strictly true here.
        
        connection-auth=on|off
                        Tell Squid that this peer does or not support Microsoft
                        connection oriented authentication, and any such
                        challenges received from there should be ignored.
                        Default is auto to automatically determine the status
                        of the peer.
        
        
        ==== SSL / HTTPS / TLS OPTIONS ====
        
        ssl             Encrypt connections to this peer with SSL/TLS.
        
        sslcert=/path/to/ssl/certificate
                        A client SSL certificate to use when connecting to
                        this peer.
        
        sslkey=/path/to/ssl/key
                        The private SSL key corresponding to sslcert above.
                        If 'sslkey' is not specified 'sslcert' is assumed to
                        reference a combined file containing both the
                        certificate and the key.
        
        sslversion=1|2|3|4|5|6
                        The SSL version to use when connecting to this peer
                                1 = automatic (default)
                                2 = SSL v2 only
                                3 = SSL v3 only
                                4 = TLS v1.0 only
                                5 = TLS v1.1 only
                                6 = TLS v1.2 only
        
        sslcipher=...   The list of valid SSL ciphers to use when connecting
                        to this peer.
        
        ssloptions=...  Specify various SSL implementation options:

                            NO_SSLv2    Disallow the use of SSLv2
                            NO_SSLv3    Disallow the use of SSLv3
                            NO_TLSv1    Disallow the use of TLSv1.0
                            NO_TLSv1_1  Disallow the use of TLSv1.1
                            NO_TLSv1_2  Disallow the use of TLSv1.2
                            SINGLE_DH_USE
                                      Always create a new key when using
                                      temporary/ephemeral DH key exchanges
                            ALL       Enable various bug workarounds
                                      suggested as "harmless" by OpenSSL
                                      Be warned that this reduces SSL/TLS
                                      strength to some attacks.

                        See the OpenSSL SSL_CTX_set_options documentation for a
                        more complete list.
        
        sslcafile=...   A file containing additional CA certificates to use
                        when verifying the peer certificate.
        
        sslcapath=...   A directory containing additional CA certificates to
                        use when verifying the peer certificate.
        
        sslcrlfile=...  A certificate revocation list file to use when
                        verifying the peer certificate.
        
        sslflags=...    Specify various flags modifying the SSL implementation:
        
                        DONT_VERIFY_PEER
                                Accept certificates even if they fail to
                                verify.
                        NO_DEFAULT_CA
                                Don't use the default CA list built in
                                to OpenSSL.
                        DONT_VERIFY_DOMAIN
                                Don't verify the peer certificate
                                matches the server name
        
        ssldomain=      The peer name as advertised in it's certificate.
                        Used for verifying the correctness of the received peer
                        certificate. If not specified the peer hostname will be
                        used.
        
        front-end-https
                        Enable the "Front-End-Https: On" header needed when
                        using Squid as a SSL frontend in front of Microsoft OWA.
                        See MS KB document Q307347 for details on this header.
                        If set to auto the header will only be added if the
                        request is forwarded as a https:// URL.
        
        
        ==== GENERAL OPTIONS ====
        
        connect-timeout=N
                        A peer-specific connect timeout.
                        Also see the peer_connect_timeout directive.
        
        connect-fail-limit=N
                        How many times connecting to a peer must fail before
                        it is marked as down. Default is 10.
        
        allow-miss      Disable Squid's use of only-if-cached when forwarding
                        requests to siblings. This is primarily useful when
                        icp_hit_stale is used by the sibling. To extensive use
                        of this option may result in forwarding loops, and you
                        should avoid having two-way peerings with this option.
                        For example to deny peer usage on requests from peer
                        by denying cache_peer_access if the source is a peer.
        
        max-conn=N      Limit the amount of connections Squid may open to this
                        peer. see also 
        
        name=xxx        Unique name for the peer.
                        Required if you have multiple peers on the same host
                        but different ports.
                        This name can be used in cache_peer_access and similar
                        directives to dentify the peer.
                        Can be used by outgoing access controls through the
                        peername ACL type.
        
        no-tproxy       Do not use the client-spoof TPROXY support when forwarding
                        requests to this peer. Use normal address selection instead.
        
        proxy-only      objects fetched from the peer will not be stored locally.
        
DOC_END

NAME: cache_peer_domain cache_host_domain
TYPE: hostdomain
DEFAULT: none
LOC: none
DOC_START
        Use to limit the domains for which a neighbor cache will be
        queried.  Usage:

        cache_peer_domain cache-host domain [domain ...]
        cache_peer_domain cache-host !domain

        For example, specifying

                cache_peer_domain parent.foo.net        .edu

        has the effect such that UDP query packets are sent to
        'bigserver' only when the requested object exists on a
        server in the .edu domain.  Prefixing the domainname
        with '!' means the cache will be queried for objects
        NOT in that domain.

        NOTE:   * Any number of domains may be given for a cache-host,
                  either on the same or separate lines.
                * When multiple domains are given for a particular
                  cache-host, the first matched domain is applied.
                * Cache hosts with no domain restrictions are queried
                  for all requests.
                * There are no defaults.
                * There is also a 'cache_peer_access' tag in the ACL
                  section.
DOC_END

NAME: cache_peer_access
TYPE: peer_access
DEFAULT: none
LOC: none
DOC_START
        Similar to 'cache_peer_domain' but provides more flexibility by
        using ACL elements.

        cache_peer_access cache-host allow|deny [!]aclname ...

        The syntax is identical to 'http_access' and the other lists of
        ACL elements.  See the comments for 'http_access' below, or
        the Squid FAQ (http://wiki.squid-cache.org/SquidFaq/SquidAcl).
DOC_END

NAME: neighbor_type_domain
TYPE: hostdomaintype
DEFAULT: none
LOC: none
DOC_START
        usage: neighbor_type_domain neighbor parent|sibling domain domain ...

        Modifying the neighbor type for specific domains is now
        possible.  You can treat some domains differently than the
        default neighbor type specified on the 'cache_peer' line.
        Normally it should only be necessary to list domains which
        should be treated differently because the default neighbor type
        applies for hostnames which do not match domains listed here.

EXAMPLE:
        cache_peer cache.foo.org parent 3128 3130
        neighbor_type_domain cache.foo.org sibling .com .net
        neighbor_type_domain cache.foo.org sibling .au .de
DOC_END

NAME: dead_peer_timeout
COMMENT: (seconds)
DEFAULT: 10 seconds
TYPE: time_t
LOC: Config.Timeout.deadPeer
DOC_START
        This controls how long Squid waits to declare a peer cache
        as "dead."  If there are no ICP replies received in this
        amount of time, Squid will declare the peer dead and not
        expect to receive any further ICP replies.  However, it
        continues to send ICP queries, and will mark the peer as
        alive upon receipt of the first subsequent ICP reply.

        This timeout also affects when Squid expects to receive ICP
        replies from peers.  If more than 'dead_peer' seconds have
        passed since the last ICP reply was received, Squid will not
        expect to receive an ICP reply on the next query.  Thus, if
        your time between requests is greater than this timeout, you
        will see a lot of requests sent DIRECT to origin servers
        instead of to your parents.
DOC_END

NAME: forward_max_tries
DEFAULT: 10
TYPE: int
LOC: Config.forward_max_tries
DOC_START
        Controls how many different forward paths Squid will try
        before giving up. See also forward_timeout.
        
        NOTE: connect_retries (default: none) can make each of these
        possible forwarding paths be tried multiple times.
DOC_END

NAME: hierarchy_stoplist
TYPE: wordlist
DEFAULT: none
LOC: Config.hierarchy_stoplist
DOC_START
        A list of words which, if found in a URL, cause the object to
        be handled directly by this cache.  In other words, use this
        to not query neighbor caches for certain objects.  You may
        list this option multiple times.

        Example:
                hierarchy_stoplist cgi-bin ?

        Note: never_direct overrides this option.
DOC_END

COMMENT_START
 MEMORY CACHE OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: cache_mem
COMMENT: (bytes)
TYPE: b_size_t
DEFAULT: 256 MB
LOC: Config.memMaxSize
DOC_START
        NOTE: THIS PARAMETER DOES NOT SPECIFY THE MAXIMUM PROCESS SIZE.
        IT ONLY PLACES A LIMIT ON HOW MUCH ADDITIONAL MEMORY SQUID WILL
        USE AS A MEMORY CACHE OF OBJECTS. SQUID USES MEMORY FOR OTHER
        THINGS AS WELL. SEE THE SQUID FAQ SECTION 8 FOR DETAILS.

        'cache_mem' specifies the ideal amount of memory to be used
        for:
                * In-Transit objects
                * Hot Objects
                * Negative-Cached objects

        Data for these objects are stored in 4 KB blocks.  This
        parameter specifies the ideal upper limit on the total size of
        4 KB blocks allocated.  In-Transit objects take the highest
        priority.

        In-transit objects have priority over the others.  When
        additional space is needed for incoming data, negative-cached
        and hot objects will be released.  In other words, the
        negative-cached and hot objects will fill up any unused space
        not needed for in-transit objects.

        If circumstances require, this limit will be exceeded.
        Specifically, if your incoming request rate requires more than
        'cache_mem' of memory to hold in-transit objects, Squid will
        exceed this limit to satisfy the new requests.  When the load
        decreases, blocks will be freed until the high-water mark is
        reached.  Thereafter, blocks will be used to store hot
        objects.

        If shared memory caching is enabled, Squid does not use the shared
        cache space for in-transit objects, but they still consume as much
        local memory as they need. For more details about the shared memory
        cache, see memory_cache_shared.
DOC_END

NAME: maximum_object_size_in_memory
COMMENT: (bytes)
TYPE: b_size_t
DEFAULT: 512 KB
LOC: Config.Store.maxInMemObjSize
DOC_START
        Objects greater than this size will not be attempted to kept in
        the memory cache. This should be set high enough to keep objects
        accessed frequently in memory to improve performance whilst low
        enough to keep larger objects from hoarding cache_mem.
DOC_END

NAME: memory_cache_shared
COMMENT: on|off
TYPE: YesNoNone
LOC: Config.memShared
DEFAULT: none
DEFAULT_DOC: "on" where supported if doing memory caching with multiple SMP workers.
DOC_START
        Controls whether the memory cache is shared among SMP workers.

        The shared memory cache is meant to occupy cache_mem bytes and replace
        the non-shared memory cache, although some entities may still be
        cached locally by workers for now (e.g., internal and in-transit
        objects may be served from a local memory cache even if shared memory
        caching is enabled).

        By default, the memory cache is shared if and only if all of the
        following conditions are satisfied: Squid runs in SMP mode with
        multiple workers, cache_mem is positive, and Squid environment
        supports required IPC primitives (e.g., POSIX shared memory segments
        and GCC-style atomic operations).

        To avoid blocking locks, shared memory uses opportunistic algorithms
        that do not guarantee that every cachable entity that could have been
        shared among SMP workers will actually be shared.

        Currently, entities exceeding 32KB in size cannot be shared.
DOC_END

NAME: memory_cache_mode
TYPE: memcachemode
LOC: Config
DEFAULT: always
DOC_START
        Controls which objects to keep in the memory cache (cache_mem)

        always  Keep most recently fetched objects in memory (default)

        disk    Only disk cache hits are kept in memory, which means
                an object must first be cached on disk and then hit
                a second time before cached in memory.

        network Only objects fetched from network is kept in memory
DOC_END

NAME: memory_replacement_policy
TYPE: removalpolicy
LOC: Config.memPolicy
DEFAULT: lru
DOC_START
        The memory replacement policy parameter determines which
        objects are purged from memory when memory space is needed.

        See cache_replacement_policy for details.
DOC_END

COMMENT_START
 DISK CACHE OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: cache_replacement_policy
TYPE: removalpolicy
LOC: Config.replPolicy
DEFAULT: lru
DOC_START
        The cache replacement policy parameter determines which
        objects are evicted (replaced) when disk space is needed.

            lru       : Squid's original list based LRU policy
            heap GDSF : Greedy-Dual Size Frequency
            heap LFUDA: Least Frequently Used with Dynamic Aging
            heap LRU  : LRU policy implemented using a heap

        Applies to any cache_dir lines listed below this.

        The LRU policies keeps recently referenced objects.

        The heap GDSF policy optimizes object hit rate by keeping smaller
        popular objects in cache so it has a better chance of getting a
        hit.  It achieves a lower byte hit rate than LFUDA though since
        it evicts larger (possibly popular) objects.

        The heap LFUDA policy keeps popular objects in cache regardless of
        their size and thus optimizes byte hit rate at the expense of
        hit rate since one large, popular object will prevent many
        smaller, slightly less popular objects from being cached.

        Both policies utilize a dynamic aging mechanism that prevents
        cache pollution that can otherwise occur with frequency-based
        replacement policies.

        NOTE: if using the LFUDA replacement policy you should increase
        the value of maximum_object_size above its default of 4096 KB to
        to maximize the potential byte hit rate improvement of LFUDA.

        For more information about the GDSF and LFUDA cache replacement
        policies see http://www.hpl.hp.com/techreports/1999/HPL-1999-69.html
        and http://fog.hpl.external.hp.com/techreports/98/HPL-98-173.html.
DOC_END

NAME: cache_dir
TYPE: cachedir
DEFAULT: none
LOC: Config.cacheSwap
DOC_START
        Usage:

        cache_dir Type Directory-Name Fs-specific-data [options]

        You can specify multiple cache_dir lines to spread the
        cache among different disk partitions.

        Type specifies the kind of storage system to use. Only "ufs"
        is built by default. To enable any of the other storage systems
        see the --enable-storeio configure option.

        'Directory' is a top-level directory where cache swap
        files will be stored.  If you want to use an entire disk
        for caching, this can be the mount-point directory.
        The directory must exist and be writable by the Squid
        process.  Squid will NOT create this directory for you.

        In SMP configurations, cache_dir must not precede the workers option
        and should use configuration macros or conditionals to give each
        worker interested in disk caching a dedicated cache directory.

        The ufs store type:

        "ufs" is the old well-known Squid storage format that has always
        been there.

        cache_dir ufs Directory-Name Mbytes L1 L2 [options]

        'Mbytes' is the amount of disk space (MB) to use under this
        directory.  The default is 100 MB.  Change this to suit your
        configuration.  Do NOT put the size of your disk drive here.
        Instead, if you want Squid to use the entire disk drive,
        subtract 20% and use that value.

        'L1' is the number of first-level subdirectories which
        will be created under the 'Directory'.  The default is 16.

        'L2' is the number of second-level subdirectories which
        will be created under each first-level directory.  The default
        is 256.

        The aufs store type:

        "aufs" uses the same storage format as "ufs", utilizing
        POSIX-threads to avoid blocking the main Squid process on
        disk-I/O. This was formerly known in Squid as async-io.

        cache_dir aufs Directory-Name Mbytes L1 L2 [options]

        see argument descriptions under ufs above

        The diskd store type:

        "diskd" uses the same storage format as "ufs", utilizing a
        separate process to avoid blocking the main Squid process on
        disk-I/O.

        cache_dir diskd Directory-Name Mbytes L1 L2 [options] [Q1=n] [Q2=n]

        see argument descriptions under ufs above

        Q1 specifies the number of unacknowledged I/O requests when Squid
        stops opening new files. If this many messages are in the queues,
        Squid won't open new files. Default is 64

        Q2 specifies the number of unacknowledged messages when Squid
        starts blocking.  If this many messages are in the queues,
        Squid blocks until it receives some replies. Default is 72

        When Q1 < Q2 (the default), the cache directory is optimized
        for lower response time at the expense of a decrease in hit
        ratio.  If Q1 > Q2, the cache directory is optimized for
        higher hit ratio at the expense of an increase in response
        time.

        The rock store type:

            cache_dir rock Directory-Name Mbytes <max-size=bytes> [options]

        The Rock Store type is a database-style storage. All cached
        entries are stored in a "database" file, using fixed-size slots,
        one entry per slot. The database size is specified in MB. The
        slot size is specified in bytes using the max-size option. See
        below for more info on the max-size option.

        swap-timeout=msec: Squid will not start writing a miss to or
        reading a hit from disk if it estimates that the swap operation
        will take more than the specified number of milliseconds. By
        default and when set to zero, disables the disk I/O time limit
        enforcement. Ignored when using blocking I/O module because
        blocking synchronous I/O does not allow Squid to estimate the
        expected swap wait time.

        max-swap-rate=swaps/sec: Artificially limits disk access using
        the specified I/O rate limit. Swap out requests that
        would cause the average I/O rate to exceed the limit are
        delayed. Individual swap in requests (i.e., hits or reads) are
        not delayed, but they do contribute to measured swap rate and
        since they are placed in the same FIFO queue as swap out
        requests, they may wait longer if max-swap-rate is smaller.
        This is necessary on file systems that buffer "too
        many" writes and then start blocking Squid and other processes
        while committing those writes to disk.  Usually used together
        with swap-timeout to avoid excessive delays and queue overflows
        when disk demand exceeds available disk "bandwidth". By default
        and when set to zero, disables the disk I/O rate limit
        enforcement. Currently supported by IpcIo module only.


        The coss store type:

        NP: COSS filesystem in Squid-3 has been deemed too unstable for
            production use and has thus been removed from this release.
            We hope that it can be made usable again soon.

        block-size=n defines the "block size" for COSS cache_dir's.
        Squid uses file numbers as block numbers.  Since file numbers
        are limited to 24 bits, the block size determines the maximum
        size of the COSS partition.  The default is 512 bytes, which
        leads to a maximum cache_dir size of 512<<24, or 8 GB.  Note
        you should not change the coss block size after Squid
        has written some objects to the cache_dir.

        The coss file store has changed from 2.5. Now it uses a file
        called 'stripe' in the directory names in the config - and
        this will be created by squid -z.

        Common options:

        no-store, no new objects should be stored to this cache_dir

        min-size=n, refers to the min object size in bytes this cache_dir
        will accept.  It's used to restrict a cache_dir to only store
        large objects (e.g. aufs) while other storedirs are optimized
        for smaller objects (e.g. COSS). Defaults to 0.

        max-size=n, refers to the max object size in bytes this cache_dir
        supports.  It is used to select the cache_dir to store the object.
        Note: To make optimal use of the max-size limits you should order
        the cache_dir lines with the smallest max-size value first and the
        ones with no max-size specification last.

        Note for coss, max-size must be less than COSS_MEMBUF_SZ,
        which can be changed with the --with-coss-membuf-size=N configure
        option.
NOCOMMENT_START

# Uncomment and adjust the following to add a disk cache directory.
#cache_dir ufs @DEFAULT_SWAP_DIR@ 100 16 256
NOCOMMENT_END
DOC_END

NAME: store_dir_select_algorithm
TYPE: string
LOC: Config.store_dir_select_algorithm
DEFAULT: least-load
DOC_START
        Set this to 'round-robin' as an alternative.
DOC_END

NAME: max_open_disk_fds
TYPE: int
LOC: Config.max_open_disk_fds
DEFAULT: 0
DOC_START
        To avoid having disk as the I/O bottleneck Squid can optionally
        bypass the on-disk cache if more than this amount of disk file
        descriptors are open.

        A value of 0 indicates no limit.
DOC_END

NAME: minimum_object_size
COMMENT: (bytes)
TYPE: b_int64_t
DEFAULT: 0 KB
LOC: Config.Store.minObjectSize
DOC_START
        Objects smaller than this size will NOT be saved on disk.  The
        value is specified in kilobytes, and the default is 0 KB, which
        means there is no minimum.
DOC_END

NAME: maximum_object_size
COMMENT: (bytes)
TYPE: b_int64_t
DEFAULT: 4096 KB
LOC: Config.Store.maxObjectSize
DOC_START
        Objects larger than this size will NOT be saved on disk.  The
        value is specified in kilobytes, and the default is 4MB.  If
        you wish to get a high BYTES hit ratio, you should probably
        increase this (one 32 MB object hit counts for 3200 10KB
        hits).  If you wish to increase speed more than your want to
        save bandwidth you should leave this low.

        NOTE: if using the LFUDA replacement policy you should increase
        this value to maximize the byte hit rate improvement of LFUDA!
        See replacement_policy below for a discussion of this policy.
DOC_END

NAME: cache_swap_low
COMMENT: (percent, 0-100)
TYPE: int
DEFAULT: 90
LOC: Config.Swap.lowWaterMark
DOC_NONE

NAME: cache_swap_high
COMMENT: (percent, 0-100)
TYPE: int
DEFAULT: 95
LOC: Config.Swap.highWaterMark
DOC_START

        The low- and high-water marks for cache object replacement.
        Replacement begins when the swap (disk) usage is above the
        low-water mark and attempts to maintain utilization near the
        low-water mark.  As swap utilization gets close to high-water
        mark object eviction becomes more aggressive.  If utilization is
        close to the low-water mark less replacement is done each time.

        Defaults are 90% and 95%. If you have a large cache, 5% could be
        hundreds of MB. If this is the case you may wish to set these
        numbers closer together.
DOC_END

COMMENT_START
 LOGFILE OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: logformat
TYPE: logformat
LOC: Log::TheConfig
DEFAULT: none
DOC_START
        Usage:

        logformat <name> <format specification>

        Defines an access log format.

        The <format specification> is a string with embedded % format codes

        % format codes all follow the same basic structure where all but
        the formatcode is optional. Output strings are automatically escaped
        as required according to their context and the output format
        modifiers are usually not needed, but can be specified if an explicit
        output format is desired.

                % ["|[|'|#] [-] [[0]width] [{argument}] formatcode

                "       output in quoted string format
                [       output in squid text log format as used by log_mime_hdrs
                #       output in URL quoted format
                '       output as-is

                -       left aligned

                width   minimum and/or maximum field width:
                            [width_min][.width_max]
                        When minimum starts with 0, the field is zero-padded.
                        String values exceeding maximum width are truncated.

                {arg}   argument such as header name etc

        Format codes:

                %       a literal % character
                sn      Unique sequence number per log line entry
                err_code    The ID of an error response served by Squid or
                                a similar internal error identifier.
                err_detail  Additional err_code-dependent error information.

        Connection related format codes:

                >a      Client source IP address
                >A      Client FQDN
                >p      Client source port
                >eui    Client source EUI (MAC address, EUI-48 or EUI-64 identifier)
                >la     Local IP address the client connected to
                >lp     Local port number the client connected to

                la      Local listening IP address the client connection was connected to.
                lp      Local listening port number the client connection was connected to.

                <a      Server IP address of the last server or peer connection
                <A      Server FQDN or peer name
                <p      Server port number of the last server or peer connection
                <la     Local IP address of the last server or peer connection
                <lp     Local port number of the last server or peer connection

        Time related format codes:

                ts      Seconds since epoch
                tu      subsecond time (milliseconds)
                tl      Local time. Optional strftime format argument
                                default %d/%b/%Y:%H:%M:%S %z
                tg      GMT time. Optional strftime format argument
                                default %d/%b/%Y:%H:%M:%S %z
                tr      Response time (milliseconds)
                dt      Total time spent making DNS lookups (milliseconds)

        Access Control related format codes:

                et      Tag returned by external acl
                ea      Log string returned by external acl
                un      User name (any available)
                ul      User name from authentication
                ue      User name from external acl helper
                ui      User name from ident
                us      User name from SSL

        HTTP related format codes:

                [http::]>h      Original request header. Optional header name argument
                                on the format header[:[separator]element]
                [http::]>ha     The HTTP request headers after adaptation and redirection. 
                                Optional header name argument as for >h
                [http::]<h      Reply header. Optional header name argument
                                as for >h
                [http::]>Hs     HTTP status code sent to the client
                [http::]<Hs     HTTP status code received from the next hop
                [http::]<bs     Number of HTTP-equivalent message body bytes 
                                received from the next hop, excluding chunked
                                transfer encoding and control messages.
                                Generated FTP/Gopher listings are treated as
                                received bodies.
                [http::]mt      MIME content type
                [http::]rm      Request method (GET/POST etc)
                [http::]>rm     Request method from client
                [http::]<rm     Request method sent to server or peer
                [http::]ru      Request URL from client (historic, filtered for logging)
                [http::]>ru     Request URL from client
                [http::]<ru     Request URL sent to server or peer
                [http::]rp      Request URL-Path excluding hostname
                [http::]>rp     Request URL-Path excluding hostname from client
                [http::]<rp     Request URL-Path excluding hostname sento to server or peer
                [http::]rv      Request protocol version
                [http::]>rv     Request protocol version from client
                [http::]<rv     Request protocol version sent to server or peer
                [http::]<st     Sent reply size including HTTP headers
                [http::]>st     Received request size including HTTP headers. In the
                                case of chunked requests the chunked encoding metadata
                                are not included
                [http::]>sh     Received HTTP request headers size
                [http::]<sh     Sent HTTP reply headers size
                [http::]st      Request+Reply size including HTTP headers
                [http::]<sH     Reply high offset sent
                [http::]<sS     Upstream object size
                [http::]<pt     Peer response time in milliseconds. The timer starts
                                when the last request byte is sent to the next hop
                                and stops when the last response byte is received.
                [http::]<tt     Total server-side time in milliseconds. The timer 
                                starts with the first connect request (or write I/O)
                                sent to the first selected peer. The timer stops
                                with the last I/O with the last peer.

        Squid handling related format codes:

                Ss      Squid request status (TCP_MISS etc)
                Sh      Squid hierarchy status (DEFAULT_PARENT etc)

        SSL-related format codes:

                ssl::bump_mode  SslBump decision for the transaction:

                                For CONNECT requests that initiated bumping of
                                a connection and for any request received on
                                an already bumped connection, Squid logs the
                                corresponding SslBump mode ("server-first" or
                                "client-first"). See the ssl_bump option for
                                more information about these modes.

                                A "none" token is logged for requests that
                                triggered "ssl_bump" ACL evaluation matching
                                either a "none" rule or no rules at all.

                                In all other cases, a single dash ("-") is
                                logged.

        If ICAP is enabled, the following code becomes available (as
        well as ICAP log codes documented with the icap_log option):

                icap::tt        Total ICAP processing time for the HTTP
                                transaction. The timer ticks when ICAP
                                ACLs are checked and when ICAP
                                transaction is in progress.

        If adaptation is enabled the following three codes become available:

                adapt::<last_h  The header of the last ICAP response or
                                meta-information from the last eCAP
                                transaction related to the HTTP transaction.
                                Like <h, accepts an optional header name
                                argument.

                adapt::sum_trs Summed adaptation transaction response
                                times recorded as a comma-separated list in
                                the order of transaction start time. Each time
                                value is recorded as an integer number,
                                representing response time of one or more
                                adaptation (ICAP or eCAP) transaction in
                                milliseconds.  When a failed transaction is
                                being retried or repeated, its time is not
                                logged individually but added to the
                                replacement (next) transaction. See also:
                                adapt::all_trs.

                adapt::all_trs All adaptation transaction response times.
                                Same as adaptation_strs but response times of
                                individual transactions are never added
                                together. Instead, all transaction response
                                times are recorded individually.

        You can prefix adapt::*_trs format codes with adaptation
        service name in curly braces to record response time(s) specific
        to that service. For example: %{my_service}adapt::sum_trs

        If SSL is enabled, the following formating codes become available:

                %ssl::>cert_subject The Subject field of the received client
                                SSL certificate or a dash ('-') if Squid has
                                received an invalid/malformed certificate or
                                no certificate at all. Consider encoding the
                                logged value because Subject often has spaces.

                %ssl::>cert_issuer The Issuer field of the received client
                                SSL certificate or a dash ('-') if Squid has
                                received an invalid/malformed certificate or
                                no certificate at all. Consider encoding the
                                logged value because Issuer often has spaces.

        The default formats available (which do not need re-defining) are:

logformat squid      %ts.%03tu %6tr %>a %Ss/%03>Hs %<st %rm %ru %[un %Sh/%<a %mt
logformat common     %>a %[ui %[un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st %Ss:%Sh
logformat combined   %>a %[ui %[un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st "%{Referer}>h" "%{User-Agent}>h" %Ss:%Sh
logformat referrer   %ts.%03tu %>a %{Referer}>h %ru
logformat useragent  %>a [%tl] "%{User-Agent}>h"

        NOTE: When the log_mime_hdrs directive is set to ON.
                The squid, common and combined formats have a safely encoded copy
                of the mime headers appended to each line within a pair of brackets.

        NOTE: The common and combined formats are not quite true to the Apache definition.
                The logs from Squid contain an extra status and hierarchy code appended.

DOC_END

NAME: access_log cache_access_log
TYPE: access_log
LOC: Config.Log.accesslogs
DEFAULT_IF_NONE: daemon:@DEFAULT_ACCESS_LOG@ squid
DOC_START
        These files log client request activities. Has a line every HTTP or
        ICP request. The format is:
        access_log <module>:<place> [<logformat name> [acl acl ...]]
        access_log none [acl acl ...]]
        
        Will log to the specified module:place using the specified format (which
        must be defined in a logformat directive) those entries which match
        ALL the acl's specified (which must be defined in acl clauses).
        If no acl is specified, all requests will be logged to this destination.
        
        ===== Modules Currently available =====
        
        none    Do not log any requests matching these ACL.
                Do not specify Place or logformat name.
        
        stdio   Write each log line to disk immediately at the completion of
                each request.
                Place: the filename and path to be written.
        
        daemon  Very similar to stdio. But instead of writing to disk the log
                line is passed to a daemon helper for asychronous handling instead.
                Place: varies depending on the daemon.
                
                log_file_daemon Place: the file name and path to be written.
        
        syslog  To log each request via syslog facility.
                Place: The syslog facility and priority level for these entries.
                Place Format:  facility.priority

                where facility could be any of:
                        authpriv, daemon, local0 ... local7 or user.

                And priority could be any of:
                        err, warning, notice, info, debug.
        
        udp     To send each log line as text data to a UDP receiver.
                Place: The destination host name or IP and port.
                Place Format:   //host:port

        tcp     To send each log line as text data to a TCP receiver.
                Place: The destination host name or IP and port.
                Place Format:   //host:port

        Default:
                access_log daemon:@DEFAULT_ACCESS_LOG@ squid
DOC_END

NAME: icap_log
TYPE: access_log
IFDEF: ICAP_CLIENT
LOC: Config.Log.icaplogs
DEFAULT: none
DOC_START
        ICAP log files record ICAP transaction summaries, one line per
        transaction.

        The icap_log option format is:
        icap_log <filepath> [<logformat name> [acl acl ...]]
        icap_log none [acl acl ...]]
        
        Please see access_log option documentation for details. The two
        kinds of logs share the overall configuration approach and many
        features.

        ICAP processing of a single HTTP message or transaction may
        require multiple ICAP transactions.  In such cases, multiple
        ICAP transaction log lines will correspond to a single access
        log line.

        ICAP log uses logformat codes that make sense for an ICAP
        transaction. Header-related codes are applied to the HTTP header
        embedded in an ICAP server response, with the following caveats:
        For REQMOD, there is no HTTP response header unless the ICAP
        server performed request satisfaction. For RESPMOD, the HTTP
        request header is the header sent to the ICAP server. For
        OPTIONS, there are no HTTP headers.

        The following format codes are also available for ICAP logs:

                icap::<A        ICAP server IP address. Similar to <A.

                icap::<service_name     ICAP service name from the icap_service
                                option in Squid configuration file.

                icap::ru        ICAP Request-URI. Similar to ru.

                icap::rm        ICAP request method (REQMOD, RESPMOD, or 
                                OPTIONS). Similar to existing rm.

                icap::>st       Bytes sent to the ICAP server (TCP payload
                                only; i.e., what Squid writes to the socket).

                icap::<st       Bytes received from the ICAP server (TCP
                                payload only; i.e., what Squid reads from
                                the socket).

                icap::<bs       Number of message body bytes received from the
                                ICAP server. ICAP message body, if any, usually
                                includes encapsulated HTTP message headers and
                                possibly encapsulated HTTP message body. The
                                HTTP body part is dechunked before its size is
                                computed.

                icap::tr        Transaction response time (in
                                milliseconds).  The timer starts when
                                the ICAP transaction is created and
                                stops when the transaction is completed.
                                Similar to tr.

                icap::tio       Transaction I/O time (in milliseconds). The
                                timer starts when the first ICAP request
                                byte is scheduled for sending. The timers
                                stops when the last byte of the ICAP response
                                is received.

                icap::to        Transaction outcome: ICAP_ERR* for all
                                transaction errors, ICAP_OPT for OPTION
                                transactions, ICAP_ECHO for 204
                                responses, ICAP_MOD for message
                                modification, and ICAP_SAT for request
                                satisfaction. Similar to Ss.

                icap::Hs        ICAP response status code. Similar to Hs.

                icap::>h        ICAP request header(s). Similar to >h.

                icap::<h        ICAP response header(s). Similar to <h.

        The default ICAP log format, which can be used without an explicit
        definition, is called icap_squid:

logformat icap_squid %ts.%03tu %6icap::tr %>a %icap::to/%03icap::Hs %icap::<size %icap::rm %icap::ru% %un -/%icap::<A -

        See also: logformat, log_icap, and %adapt::<last_h 
DOC_END

NAME: logfile_daemon
TYPE: string
DEFAULT: @DEFAULT_LOGFILED@
LOC: Log::TheConfig.logfile_daemon
DOC_START
        Specify the path to the logfile-writing daemon. This daemon is
        used to write the access and store logs, if configured.

        Squid sends a number of commands to the log daemon:
          L<data>\n - logfile data
          R\n - rotate file
          T\n - truncate file
          O\n - reopen file
          F\n - flush file
          r<n>\n - set rotate count to <n>
          b<n>\n - 1 = buffer output, 0 = don't buffer output

        No responses is expected.
DOC_END

NAME: log_access
TYPE: acl_access
LOC: Config.accessList.log
DEFAULT: none
COMMENT: allow|deny acl acl...
DOC_START
        This options allows you to control which requests gets logged
        to access.log (see access_log directive). Requests denied for
        logging will also not be accounted for in performance counters.

        This clause only supports fast acl types.
        See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
DOC_END

NAME: log_icap
TYPE: acl_access
IFDEF: ICAP_CLIENT
LOC: Config.accessList.icap
DEFAULT: none
DOC_START
        This options allows you to control which requests get logged
        to icap.log. See the icap_log directive for ICAP log details.
DOC_END

NAME: cache_store_log
TYPE: string
DEFAULT: none
LOC: Config.Log.store
DOC_START
        Logs the activities of the storage manager.  Shows which
        objects are ejected from the cache, and which objects are
        saved and for how long.  To disable, enter "none" or remove the line.
        There are not really utilities to analyze this data, so you can safely
        disable it.

        Example:
                cache_store_log @DEFAULT_STORE_LOG@
DOC_END

NAME: cache_swap_state cache_swap_log
TYPE: string
LOC: Config.Log.swap
DEFAULT: none
DOC_START
        Location for the cache "swap.state" file. This index file holds
        the metadata of objects saved on disk.  It is used to rebuild
        the cache during startup.  Normally this file resides in each
        'cache_dir' directory, but you may specify an alternate
        pathname here.  Note you must give a full filename, not just
        a directory. Since this is the index for the whole object
        list you CANNOT periodically rotate it!

        If %s can be used in the file name it will be replaced with a
        a representation of the cache_dir name where each / is replaced
        with '.'. This is needed to allow adding/removing cache_dir
        lines when cache_swap_log is being used.

        If have more than one 'cache_dir', and %s is not used in the name
        these swap logs will have names such as:

                cache_swap_log.00
                cache_swap_log.01
                cache_swap_log.02

        The numbered extension (which is added automatically)
        corresponds to the order of the 'cache_dir' lines in this
        configuration file.  If you change the order of the 'cache_dir'
        lines in this file, these index files will NOT correspond to
        the correct 'cache_dir' entry (unless you manually rename
        them).  We recommend you do NOT use this option.  It is
        better to keep these index files in each 'cache_dir' directory.
DOC_END

NAME: logfile_rotate
TYPE: int
DEFAULT: 10
LOC: Config.Log.rotateNumber
DOC_START
        Specifies the number of logfile rotations to make when you
        type 'squid -k rotate'. The default is 10, which will rotate
        with extensions 0 through 9. Setting logfile_rotate to 0 will
        disable the file name rotation, but the logfiles are still closed
        and re-opened. This will enable you to rename the logfiles
        yourself just before sending the rotate signal.

        Note, the 'squid -k rotate' command normally sends a USR1
        signal to the running squid process.  In certain situations
        (e.g. on Linux with Async I/O), USR1 is used for other
        purposes, so -k rotate uses another signal.  It is best to get
        in the habit of using 'squid -k rotate' instead of 'kill -USR1
        <pid>'.

        Note, from Squid-3.1 this option has no effect on the cache.log,
        that log can be rotated separately by using debug_options
DOC_END

NAME: emulate_httpd_log
TYPE: obsolete
DOC_START
        Replace this with an access_log directive using the format 'common' or 'combined'.
DOC_END

NAME: log_ip_on_direct
TYPE: obsolete
DOC_START
        Remove this option from your config. To log server or peer names use %<A in the log format.
DOC_END

NAME: mime_table
TYPE: string
DEFAULT: @DEFAULT_MIME_TABLE@
LOC: Config.mimeTablePathname
DOC_START
        Pathname to Squid's MIME table. You shouldn't need to change
        this, but the default file contains examples and formatting
        information if you do.
DOC_END

NAME: log_mime_hdrs
COMMENT: on|off
TYPE: onoff
LOC: Config.onoff.log_mime_hdrs
DEFAULT: off
DOC_START
        The Cache can record both the request and the response MIME
        headers for each HTTP transaction.  The headers are encoded
        safely and will appear as two bracketed fields at the end of
        the access log (for either the native or httpd-emulated log
        formats).  To enable this logging set log_mime_hdrs to 'on'.
DOC_END

NAME: useragent_log
TYPE: obsolete
DOC_START
        Replace this with an access_log directive using the format 'useragent'.
DOC_END

NAME: referer_log referrer_log
TYPE: obsolete
DOC_START
        Replace this with an access_log directive using the format 'referrer'.
DOC_END

NAME: pid_filename
TYPE: string
DEFAULT: @DEFAULT_PID_FILE@
LOC: Config.pidFilename
DOC_START
        A filename to write the process-id to.  To disable, enter "none".
DOC_END

NAME: log_fqdn
TYPE: obsolete
DOC_START
        Remove this option from your config. To log FQDN use %>A in the log format.
DOC_END

NAME: client_netmask
TYPE: address
LOC: Config.Addrs.client_netmask
DEFAULT: no_addr
DOC_START
        A netmask for client addresses in logfiles and cachemgr output.
        Change this to protect the privacy of your cache clients.
        A netmask of 255.255.255.0 will log all IP's in that range with
        the last digit set to '0'.
DOC_END

NAME: forward_log
TYPE: obsolete
DOC_START
        Use a regular access.log with ACL limiting it to MISS events.
DOC_END

NAME: strip_query_terms
TYPE: onoff
LOC: Config.onoff.strip_query_terms
DEFAULT: on
DOC_START
        By default, Squid strips query terms from requested URLs before
        logging.  This protects your user's privacy.
DOC_END

NAME: buffered_logs
COMMENT: on|off
TYPE: onoff
DEFAULT: off
LOC: Config.onoff.buffered_logs
DOC_START
        cache.log log file is written with stdio functions, and as such
        it can be buffered or unbuffered. By default it will be unbuffered.
        Buffering it can speed up the writing slightly (though you are
        unlikely to need to worry unless you run with tons of debugging
        enabled in which case performance will suffer badly anyway..).
DOC_END

NAME: netdb_filename
TYPE: string
DEFAULT: stdio:@DEFAULT_NETDB_FILE@
LOC: Config.netdbFilename
IFDEF: USE_ICMP
DOC_START
        A filename where Squid stores it's netdb state between restarts.
        To disable, enter "none".
DOC_END

COMMENT_START
 OPTIONS FOR TROUBLESHOOTING
 -----------------------------------------------------------------------------
COMMENT_END

NAME: cache_log
TYPE: string
DEFAULT_IF_NONE: @DEFAULT_CACHE_LOG@
LOC: Debug::cache_log
DOC_START
        Cache logging file. This is where general information about
        your cache's behavior goes. You can increase the amount of data
        logged to this file and how often its rotated with "debug_options"
DOC_END

NAME: debug_options
TYPE: eol
DEFAULT: ALL,1
LOC: Debug::debugOptions
DOC_START
        Logging options are set as section,level where each source file
        is assigned a unique section.  Lower levels result in less
        output,  Full debugging (level 9) can result in a very large
        log file, so be careful.

        The magic word "ALL" sets debugging levels for all sections.
        We recommend normally running with "ALL,1".

        The rotate=N option can be used to keep more or less of these logs
        than would otherwise be kept by logfile_rotate.
        For most uses a single log should be enough to monitor current
        events affecting Squid.
DOC_END

NAME: coredump_dir
TYPE: string
LOC: Config.coredump_dir
DEFAULT_IF_NONE: none
DOC_START
        By default Squid leaves core files in the directory from where
        it was started. If you set 'coredump_dir' to a directory
        that exists, Squid will chdir() to that directory at startup
        and coredump files will be left there.

NOCOMMENT_START

# Leave coredumps in the first cache dir
coredump_dir @DEFAULT_SWAP_DIR@
NOCOMMENT_END
DOC_END


COMMENT_START
 OPTIONS FOR FTP GATEWAYING
 -----------------------------------------------------------------------------
COMMENT_END

NAME: ftp_user
TYPE: string
DEFAULT: Squid@
LOC: Config.Ftp.anon_user
DOC_START
        If you want the anonymous login password to be more informative
        (and enable the use of picky ftp servers), set this to something
        reasonable for your domain, like wwwuser@somewhere.net

        The reason why this is domainless by default is the
        request can be made on the behalf of a user in any domain,
        depending on how the cache is used.
        Some ftp server also validate the email address is valid
        (for example perl.com).
DOC_END

NAME: ftp_passive
TYPE: onoff
DEFAULT: on
LOC: Config.Ftp.passive
DOC_START
        If your firewall does not allow Squid to use passive
        connections, turn off this option.

        Use of ftp_epsv_all option requires this to be ON.
DOC_END

NAME: ftp_epsv_all
TYPE: onoff
DEFAULT: off
LOC: Config.Ftp.epsv_all
DOC_START
        FTP Protocol extensions permit the use of a special "EPSV ALL" command.

        NATs may be able to put the connection on a "fast path" through the
        translator, as the EPRT command will never be used and therefore,
        translation of the data portion of the segments will never be needed.

        When a client only expects to do two-way FTP transfers this may be
        useful.
        If squid finds that it must do a three-way FTP transfer after issuing
        an EPSV ALL command, the FTP session will fail.

        If you have any doubts about this option do not use it.
        Squid will nicely attempt all other connection methods.

        Requires ftp_passive to be ON (default) for any effect.
DOC_END

NAME: ftp_epsv
TYPE: onoff
DEFAULT: on
LOC: Config.Ftp.epsv
DOC_START
        FTP Protocol extensions permit the use of a special "EPSV" command.

        NATs may be able to put the connection on a "fast path" through the
        translator using EPSV, as the EPRT command will never be used
        and therefore, translation of the data portion of the segments 
        will never be needed.

        Turning this OFF will prevent EPSV being attempted.
        WARNING: Doing so will convert Squid back to the old behavior with all
        the related problems with external NAT devices/layers.

        Requires ftp_passive to be ON (default) for any effect.
DOC_END

NAME: ftp_eprt
TYPE: onoff
DEFAULT: on
LOC: Config.Ftp.eprt
DOC_START
        FTP Protocol extensions permit the use of a special "EPRT" command.

        This extension provides a protocol neutral alternative to the
        IPv4-only PORT command. When supported it enables active FTP data
        channels over IPv6 and efficient NAT handling.

        Turning this OFF will prevent EPRT being attempted and will skip
        straight to using PORT for IPv4 servers.

        Some devices are known to not handle this extension correctly and
        may result in crashes. Devices which suport EPRT enough to fail
        cleanly will result in Squid attempting PORT anyway. This directive
        should only be disabled when EPRT results in device failures.

        WARNING: Doing so will convert Squid back to the old behavior with all
        the related problems with external NAT devices/layers and IPv4-only FTP.
DOC_END

NAME: ftp_sanitycheck
TYPE: onoff
DEFAULT: on
LOC: Config.Ftp.sanitycheck
DOC_START
        For security and data integrity reasons Squid by default performs
        sanity checks of the addresses of FTP data connections ensure the
        data connection is to the requested server. If you need to allow
        FTP connections to servers using another IP address for the data
        connection turn this off.
DOC_END

NAME: ftp_telnet_protocol
TYPE: onoff
DEFAULT: on
LOC: Config.Ftp.telnet
DOC_START
        The FTP protocol is officially defined to use the telnet protocol
        as transport channel for the control connection. However, many
        implementations are broken and does not respect this aspect of
        the FTP protocol.

        If you have trouble accessing files with ASCII code 255 in the
        path or similar problems involving this ASCII code you can
        try setting this directive to off. If that helps, report to the
        operator of the FTP server in question that their FTP server
        is broken and does not follow the FTP standard.
DOC_END

COMMENT_START
 OPTIONS FOR EXTERNAL SUPPORT PROGRAMS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: diskd_program
TYPE: string
DEFAULT: @DEFAULT_DISKD@
LOC: Config.Program.diskd
DOC_START
        Specify the location of the diskd executable.
        Note this is only useful if you have compiled in
        diskd as one of the store io modules.
DOC_END

NAME: unlinkd_program
IFDEF: USE_UNLINKD
TYPE: string
DEFAULT: @DEFAULT_UNLINKD@
LOC: Config.Program.unlinkd
DOC_START
        Specify the location of the executable for file deletion process.
DOC_END

NAME: pinger_program
TYPE: string
DEFAULT: @DEFAULT_PINGER@
LOC: Config.pinger.program
IFDEF: USE_ICMP
DOC_START
        Specify the location of the executable for the pinger process.
DOC_END

NAME: pinger_enable
TYPE: onoff
DEFAULT: on
LOC: Config.pinger.enable
IFDEF: USE_ICMP
DOC_START
        Control whether the pinger is active at run-time.
        Enables turning ICMP pinger on and off with a simple
        squid -k reconfigure.
DOC_END


COMMENT_START
 OPTIONS FOR URL REWRITING
 -----------------------------------------------------------------------------
COMMENT_END

NAME: url_rewrite_program redirect_program
TYPE: wordlist
LOC: Config.Program.redirect
DEFAULT: none
DOC_START
        Specify the location of the executable URL rewriter to use.
        Since they can perform almost any function there isn't one included.

        For each requested URL, the rewriter will receive on line with the format

        URL <SP> client_ip "/" fqdn <SP> user <SP> method [<SP> kvpairs]<NL>

        In the future, the rewriter interface will be extended with
        key=value pairs ("kvpairs" shown above).  Rewriter programs
        should be prepared to receive and possibly ignore additional
        whitespace-separated tokens on each input line.

        And the rewriter may return a rewritten URL. The other components of
        the request line does not need to be returned (ignored if they are).

        The rewriter can also indicate that a client-side redirect should
        be performed to the new URL. This is done by prefixing the returned
        URL with "301:" (moved permanently) or 302: (moved temporarily), etc.

        By default, a URL rewriter is not used.
DOC_END

NAME: url_rewrite_children redirect_children
TYPE: HelperChildConfig
DEFAULT: 20 startup=0 idle=1 concurrency=0
LOC: Config.redirectChildren
DOC_START
        The maximum number of redirector processes to spawn. If you limit
        it too few Squid will have to wait for them to process a backlog of
        URLs, slowing it down. If you allow too many they will use RAM
        and other system resources noticably.
        
        The startup= and idle= options allow some measure of skew in your
        tuning.
        
                startup=
        
        Sets a minimum of how many processes are to be spawned when Squid
        starts or reconfigures. When set to zero the first request will
        cause spawning of the first child process to handle it.
        
        Starting too few will cause an initial slowdown in traffic as Squid
        attempts to simultaneously spawn enough processes to cope.
        
                idle=
        
        Sets a minimum of how many processes Squid is to try and keep available
        at all times. When traffic begins to rise above what the existing
        processes can handle this many more will be spawned up to the maximum
        configured. A minimum setting of 1 is required.

                concurrency=

        The number of requests each redirector helper can handle in
        parallel. Defaults to 0 which indicates the redirector
        is a old-style single threaded redirector.

        When this directive is set to a value >= 1 then the protocol
        used to communicate with the helper is modified to include
        a request ID in front of the request/response. The request
        ID from the request must be echoed back with the response
        to that request.
DOC_END

NAME: url_rewrite_host_header redirect_rewrites_host_header
TYPE: onoff
DEFAULT: on
LOC: Config.onoff.redir_rewrites_host
DOC_START
        To preserve same-origin security policies in browsers and
        prevent Host: header forgery by redirectors Squid rewrites
        any Host: header in redirected requests.
        
        If you are running an accelerator this may not be a wanted
        effect of a redirector. This directive enables you disable
        Host: alteration in reverse-proxy traffic.
        
        WARNING: Entries are cached on the result of the URL rewriting
        process, so be careful if you have domain-virtual hosts.
        
        WARNING: Squid and other software verifies the URL and Host
        are matching, so be careful not to relay through other proxies
        or inspecting firewalls with this disabled.
DOC_END

NAME: url_rewrite_access redirector_access
TYPE: acl_access
DEFAULT: none
LOC: Config.accessList.redirector
DOC_START
        If defined, this access list specifies which requests are
        sent to the redirector processes.  By default all requests
        are sent.

        This clause supports both fast and slow acl types.
        See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
DOC_END

NAME: url_rewrite_bypass redirector_bypass
TYPE: onoff
LOC: Config.onoff.redirector_bypass
DEFAULT: off
DOC_START
        When this is 'on', a request will not go through the
        redirector if all redirectors are busy.  If this is 'off'
        and the redirector queue grows too large, Squid will exit
        with a FATAL error and ask you to increase the number of
        redirectors.  You should only enable this if the redirectors
        are not critical to your caching system.  If you use
        redirectors for access control, and you enable this option,
        users may have access to pages they should not
        be allowed to request.
DOC_END

COMMENT_START
 OPTIONS FOR TUNING THE CACHE
 -----------------------------------------------------------------------------
COMMENT_END

NAME: cache no_cache
TYPE: acl_access
DEFAULT: none
LOC: Config.accessList.noCache
DOC_START
        A list of ACL elements which, if matched and denied, cause the request to
        not be satisfied from the cache and the reply to not be cached.
        In other words, use this to force certain objects to never be cached.

        You must use the words 'allow' or 'deny' to indicate whether items
        matching the ACL should be allowed or denied into the cache.

        Default is to allow all to be cached.

        This clause supports both fast and slow acl types.
        See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
DOC_END

NAME: max_stale
COMMENT: time-units
TYPE: time_t
LOC: Config.maxStale
DEFAULT: 1 week
DOC_START
        This option puts an upper limit on how stale content Squid
        will serve from the cache if cache validation fails.
        Can be overriden by the refresh_pattern max-stale option.
DOC_END

NAME: refresh_pattern
TYPE: refreshpattern
LOC: Config.Refresh
DEFAULT: none
DOC_START
        usage: refresh_pattern [-i] regex min percent max [options]

        By default, regular expressions are CASE-SENSITIVE.  To make
        them case-insensitive, use the -i option.

        'Min' is the time (in minutes) an object without an explicit
        expiry time should be considered fresh. The recommended
        value is 0, any higher values may cause dynamic applications
        to be erroneously cached unless the application designer
        has taken the appropriate actions.

        'Percent' is a percentage of the objects age (time since last
        modification age) an object without explicit expiry time
        will be considered fresh.

        'Max' is an upper limit on how long objects without an explicit
        expiry time will be considered fresh.

        options: override-expire
                 override-lastmod
                 reload-into-ims
                 ignore-reload
                 ignore-no-cache
                 ignore-no-store
                 ignore-must-revalidate
                 ignore-private
                 ignore-auth
                 max-stale=NN
                 refresh-ims
                 store-stale

                override-expire enforces min age even if the server
                sent an explicit expiry time (e.g., with the
                Expires: header or Cache-Control: max-age). Doing this
                VIOLATES the HTTP standard.  Enabling this feature
                could make you liable for problems which it causes.

                Note: override-expire does not enforce staleness - it only extends
                freshness / min. If the server returns a Expires time which
                is longer than your max time, Squid will still consider
                the object fresh for that period of time.

                override-lastmod enforces min age even on objects
                that were modified recently.

                reload-into-ims changes client no-cache or ``reload''
                to If-Modified-Since requests. Doing this VIOLATES the
                HTTP standard. Enabling this feature could make you
                liable for problems which it causes.

                ignore-reload ignores a client no-cache or ``reload''
                header. Doing this VIOLATES the HTTP standard. Enabling
                this feature could make you liable for problems which
                it causes.

                ignore-no-cache ignores any ``Pragma: no-cache'' and
                ``Cache-control: no-cache'' headers received from a server.
                The HTTP RFC never allows the use of this (Pragma) header
                from a server, only a client, though plenty of servers
                send it anyway.

                ignore-no-store ignores any ``Cache-control: no-store''
                headers received from a server. Doing this VIOLATES
                the HTTP standard. Enabling this feature could make you
                liable for problems which it causes.

                ignore-must-revalidate ignores any ``Cache-Control: must-revalidate``
                headers received from a server. Doing this VIOLATES
                the HTTP standard. Enabling this feature could make you
                liable for problems which it causes.

                ignore-private ignores any ``Cache-control: private''
                headers received from a server. Doing this VIOLATES
                the HTTP standard. Enabling this feature could make you
                liable for problems which it causes.

                ignore-auth caches responses to requests with authorization,
                as if the originserver had sent ``Cache-control: public''
                in the response header. Doing this VIOLATES the HTTP standard.
                Enabling this feature could make you liable for problems which
                it causes.

                refresh-ims causes squid to contact the origin server
                when a client issues an If-Modified-Since request. This
                ensures that the client will receive an updated version
                if one is available.

                store-stale stores responses even if they don't have explicit 
                freshness or a validator (i.e., Last-Modified or an ETag) 
                present, or if they're already stale. By default, Squid will 
                not cache such responses because they usually can't be
                reused. Note that such responses will be stale by default.

                max-stale=NN provide a maximum staleness factor. Squid won't
                serve objects more stale than this even if it failed to
                validate the object. Default: use the max_stale global limit.

        Basically a cached object is:

                FRESH if expires < now, else STALE
                STALE if age > max
                FRESH if lm-factor < percent, else STALE
                FRESH if age < min
                else STALE

        The refresh_pattern lines are checked in the order listed here.
        The first entry which matches is used.  If none of the entries
        match the default will be used.

        Note, you must uncomment all the default lines if you want
        to change one. The default setting is only active if none is
        used.

NOCOMMENT_START

# Add any of your own refresh_pattern entries above these.
refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern -i (/cgi-bin/|\?) 0     0%      0
refresh_pattern .               0       20%     4320
NOCOMMENT_END
DOC_END

NAME: quick_abort_min
COMMENT: (KB)
TYPE: kb_int64_t
DEFAULT: 16 KB
LOC: Config.quickAbort.min
DOC_NONE

NAME: quick_abort_max
COMMENT: (KB)
TYPE: kb_int64_t
DEFAULT: 16 KB
LOC: Config.quickAbort.max
DOC_NONE

NAME: quick_abort_pct
COMMENT: (percent)
TYPE: int
DEFAULT: 95
LOC: Config.quickAbort.pct
DOC_START
        The cache by default continues downloading aborted requests
        which are almost completed (less than 16 KB remaining). This
        may be undesirable on slow (e.g. SLIP) links and/or very busy
        caches.  Impatient users may tie up file descriptors and
        bandwidth by repeatedly requesting and immediately aborting
        downloads.

        When the user aborts a request, Squid will check the
        quick_abort values to the amount of data transfered until
        then.

        If the transfer has less than 'quick_abort_min' KB remaining,
        it will finish the retrieval.

        If the transfer has more than 'quick_abort_max' KB remaining,
        it will abort the retrieval.

        If more than 'quick_abort_pct' of the transfer has completed,
        it will finish the retrieval.

        If you do not want any retrieval to continue after the client
        has aborted, set both 'quick_abort_min' and 'quick_abort_max'
        to '0 KB'.

        If you want retrievals to always continue if they are being
        cached set 'quick_abort_min' to '-1 KB'.
DOC_END

NAME: read_ahead_gap
COMMENT: buffer-size
TYPE: b_int64_t
LOC: Config.readAheadGap
DEFAULT: 16 KB
DOC_START
        The amount of data the cache will buffer ahead of what has been
        sent to the client when retrieving an object from another server.
DOC_END

NAME: negative_ttl
IFDEF: USE_HTTP_VIOLATIONS
COMMENT: time-units
TYPE: time_t
LOC: Config.negativeTtl
DEFAULT: 0 seconds
DOC_START
        Set the Default Time-to-Live (TTL) for failed requests.
        Certain types of failures (such as "connection refused" and
        "404 Not Found") are able to be negatively-cached for a short time.
        Modern web servers should provide Expires: header, however if they
        do not this can provide a minimum TTL.
        The default is not to cache errors with unknown expiry details.

        Note that this is different from negative caching of DNS lookups.

        WARNING: Doing this VIOLATES the HTTP standard.  Enabling
        this feature could make you liable for problems which it
        causes.
DOC_END

NAME: positive_dns_ttl
COMMENT: time-units
TYPE: time_t
LOC: Config.positiveDnsTtl
DEFAULT: 6 hours
DOC_START
        Upper limit on how long Squid will cache positive DNS responses.
        Default is 6 hours (360 minutes). This directive must be set
        larger than negative_dns_ttl.
DOC_END

NAME: negative_dns_ttl
COMMENT: time-units
TYPE: time_t
LOC: Config.negativeDnsTtl
DEFAULT: 1 minutes
DOC_START
        Time-to-Live (TTL) for negative caching of failed DNS lookups.
        This also sets the lower cache limit on positive lookups.
        Minimum value is 1 second, and it is not recommendable to go
        much below 10 seconds.
DOC_END

NAME: range_offset_limit
COMMENT: size [acl acl...]
TYPE: acl_b_size_t
LOC: Config.rangeOffsetLimit
DEFAULT: none
DOC_START
        usage: (size) [units] [[!]aclname]
        
        Sets an upper limit on how far (number of bytes) into the file 
        a Range request may be to cause Squid to prefetch the whole file. 
        If beyond this limit, Squid forwards the Range request as it is and 
        the result is NOT cached.
        
        This is to stop a far ahead range request (lets say start at 17MB)
        from making Squid fetch the whole object up to that point before
        sending anything to the client.
        
        Multiple range_offset_limit lines may be specified, and they will 
        be searched from top to bottom on each request until a match is found. 
        The first match found will be used.  If no line matches a request, the 
        default limit of 0 bytes will be used.
        
        'size' is the limit specified as a number of units.
        
        'units' specifies whether to use bytes, KB, MB, etc.
        If no units are specified bytes are assumed.
        
        A size of 0 causes Squid to never fetch more than the
        client requested. (default)
        
        A size of 'none' causes Squid to always fetch the object from the
        beginning so it may cache the result. (2.0 style)
        
        'aclname' is the name of a defined ACL.
        
        NP: Using 'none' as the byte value here will override any quick_abort settings 
            that may otherwise apply to the range request. The range request will
            be fully fetched from start to finish regardless of the client
            actions. This affects bandwidth usage.
DOC_END

NAME: minimum_expiry_time
COMMENT: (seconds)
TYPE: time_t
LOC: Config.minimum_expiry_time
DEFAULT: 60 seconds
DOC_START
        The minimum caching time according to (Expires - Date)
        Headers Squid honors if the object can't be revalidated
        defaults to 60 seconds. In reverse proxy environments it
        might be desirable to honor shorter object lifetimes. It
        is most likely better to make your server return a
        meaningful Last-Modified header however. In ESI environments
        where page fragments often have short lifetimes, this will
        often be best set to 0.
DOC_END

NAME: store_avg_object_size
COMMENT: (bytes)
TYPE: b_int64_t
DEFAULT: 13 KB
LOC: Config.Store.avgObjectSize
DOC_START
        Average object size, used to estimate number of objects your
        cache can hold.  The default is 13 KB.
DOC_END

NAME: store_objects_per_bucket
TYPE: int
DEFAULT: 20
LOC: Config.Store.objectsPerBucket
DOC_START
        Target number of objects per bucket in the store hash table.
        Lowering this value increases the total number of buckets and
        also the storage maintenance rate.  The default is 20.
DOC_END

COMMENT_START
 HTTP OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: request_header_max_size
COMMENT: (KB)
TYPE: b_size_t
DEFAULT: 64 KB
LOC: Config.maxRequestHeaderSize
DOC_START
        This specifies the maximum size for HTTP headers in a request.
        Request headers are usually relatively small (about 512 bytes).
        Placing a limit on the request header size will catch certain
        bugs (for example with persistent connections) and possibly
        buffer-overflow or denial-of-service attacks.
DOC_END

NAME: reply_header_max_size
COMMENT: (KB)
TYPE: b_size_t
DEFAULT: 64 KB
LOC: Config.maxReplyHeaderSize
DOC_START
        This specifies the maximum size for HTTP headers in a reply.
        Reply headers are usually relatively small (about 512 bytes).
        Placing a limit on the reply header size will catch certain
        bugs (for example with persistent connections) and possibly
        buffer-overflow or denial-of-service attacks.
DOC_END

NAME: request_body_max_size
COMMENT: (bytes)
TYPE: b_int64_t
DEFAULT: 0 KB
LOC: Config.maxRequestBodySize
DOC_START
        This specifies the maximum size for an HTTP request body.
        In other words, the maximum size of a PUT/POST request.
        A user who attempts to send a request with a body larger
        than this limit receives an "Invalid Request" error message.
        If you set this parameter to a zero (the default), there will
        be no limit imposed.
DOC_END

NAME: client_request_buffer_max_size
COMMENT: (bytes)
TYPE: b_size_t
DEFAULT: 512 KB
LOC: Config.maxRequestBufferSize
DOC_START
        This specifies the maximum buffer size of a client request.
        It prevents squid eating too much memory when somebody uploads
        a large file.
DOC_END

NAME: chunked_request_body_max_size
COMMENT: (bytes)
TYPE: b_int64_t
DEFAULT: 64 KB
LOC: Config.maxChunkedRequestBodySize
DOC_START
        A broken or confused HTTP/1.1 client may send a chunked HTTP
        request to Squid. Squid does not have full support for that
        feature yet. To cope with such requests, Squid buffers the
        entire request and then dechunks request body to create a
        plain HTTP/1.0 request with a known content length. The plain
        request is then used by the rest of Squid code as usual.

        The option value specifies the maximum size of the buffer used
        to hold the request before the conversion. If the chunked
        request size exceeds the specified limit, the conversion
        fails, and the client receives an "unsupported request" error,
        as if dechunking was disabled.

        Dechunking is enabled by default. To disable conversion of
        chunked requests, set the maximum to zero.

        Request dechunking feature and this option in particular are a
        temporary hack. When chunking requests and responses are fully
        supported, there will be no need to buffer a chunked request.
DOC_END

NAME: broken_posts
IFDEF: USE_HTTP_VIOLATIONS
TYPE: acl_access
DEFAULT: none
LOC: Config.accessList.brokenPosts
DOC_START
        A list of ACL elements which, if matched, causes Squid to send
        an extra CRLF pair after the body of a PUT/POST request.

        Some HTTP servers has broken implementations of PUT/POST,
        and rely on an extra CRLF pair sent by some WWW clients.

        Quote from RFC2616 section 4.1 on this matter:

          Note: certain buggy HTTP/1.0 client implementations generate an
          extra CRLF's after a POST request. To restate what is explicitly
          forbidden by the BNF, an HTTP/1.1 client must not preface or follow
          a request with an extra CRLF.

        This clause only supports fast acl types.
        See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.

Example:
 acl buggy_server url_regex ^http://....
 broken_posts allow buggy_server
DOC_END

NAME: adaptation_uses_indirect_client icap_uses_indirect_client
COMMENT: on|off
TYPE: onoff
IFDEF: FOLLOW_X_FORWARDED_FOR&&USE_ADAPTATION
DEFAULT: on
LOC: Adaptation::Config::use_indirect_client
DOC_START
        Controls whether the indirect client IP address (instead of the direct
        client IP address) is passed to adaptation services.

        See also: follow_x_forwarded_for adaptation_send_client_ip
DOC_END

NAME: via
IFDEF: USE_HTTP_VIOLATIONS
COMMENT: on|off
TYPE: onoff
DEFAULT: on
LOC: Config.onoff.via
DOC_START
        If set (default), Squid will include a Via header in requests and
        replies as required by RFC2616.
DOC_END

NAME: ie_refresh
COMMENT: on|off
TYPE: onoff
LOC: Config.onoff.ie_refresh
DEFAULT: off
DOC_START
        Microsoft Internet Explorer up until version 5.5 Service
        Pack 1 has an issue with transparent proxies, wherein it
        is impossible to force a refresh.  Turning this on provides
        a partial fix to the problem, by causing all IMS-REFRESH
        requests from older IE versions to check the origin server
        for fresh content.  This reduces hit ratio by some amount
        (~10% in my experience), but allows users to actually get
        fresh content when they want it.  Note because Squid
        cannot tell if the user is using 5.5 or 5.5SP1, the behavior
        of 5.5 is unchanged from old versions of Squid (i.e. a
        forced refresh is impossible).  Newer versions of IE will,
        hopefully, continue to have the new behavior and will be
        handled based on that assumption.  This option defaults to
        the old Squid behavior, which is better for hit ratios but
        worse for clients using IE, if they need to be able to
        force fresh content.
DOC_END

NAME: vary_ignore_expire
COMMENT: on|off
TYPE: onoff
LOC: Config.onoff.vary_ignore_expire
DEFAULT: off
DOC_START
        Many HTTP servers supporting Vary gives such objects
        immediate expiry time with no cache-control header
        when requested by a HTTP/1.0 client. This option
        enables Squid to ignore such expiry times until
        HTTP/1.1 is fully implemented.

        WARNING: If turned on this may eventually cause some
        varying objects not intended for caching to get cached.
DOC_END

NAME: request_entities
TYPE: onoff
LOC: Config.onoff.request_entities
DEFAULT: off
DOC_START
        Squid defaults to deny GET and HEAD requests with request entities,
        as the meaning of such requests are undefined in the HTTP standard
        even if not explicitly forbidden.

        Set this directive to on if you have clients which insists
        on sending request entities in GET or HEAD requests. But be warned
        that there is server software (both proxies and web servers) which
        can fail to properly process this kind of request which may make you
        vulnerable to cache pollution attacks if enabled.
DOC_END

NAME: request_header_access
IFDEF: USE_HTTP_VIOLATIONS
TYPE: http_header_access
LOC: Config.request_header_access
DEFAULT: none
DOC_START
        Usage: request_header_access header_name allow|deny [!]aclname ...

        WARNING: Doing this VIOLATES the HTTP standard.  Enabling
        this feature could make you liable for problems which it
        causes.

        This option replaces the old 'anonymize_headers' and the
        older 'http_anonymizer' option with something that is much
        more configurable. A list of ACLs for each header name allows
        removal of specific header fields under specific conditions.

        This option only applies to outgoing HTTP request headers (i.e.,
        headers sent by Squid to the next HTTP hop such as a cache peer
        or an origin server). The option has no effect during cache hit
        detection. The equivalent adaptation vectoring point in ICAP
        terminology is post-cache REQMOD.

        The option is applied to individual outgoing request header
        fields. For each request header field F, Squid uses the first
        qualifying sets of request_header_access rules:

            1. Rules with header_name equal to F's name.
            2. Rules with header_name 'Other', provided F's name is not
               on the hard-coded list of commonly used HTTP header names.
            3. Rules with header_name 'All'.

        Within that qualifying rule set, rule ACLs are checked as usual.
        If ACLs of an "allow" rule match, the header field is allowed to
        go through as is. If ACLs of a "deny" rule match, the header is
        removed and request_header_replace is then checked to identify
        if the removed header has a replacement. If no rules within the
        set have matching ACLs, the header field is left as is.

        For example, to achieve the same behavior as the old
        'http_anonymizer standard' option, you should use:

                request_header_access From deny all
                request_header_access Referer deny all
                request_header_access Server deny all
                request_header_access User-Agent deny all
                request_header_access WWW-Authenticate deny all
                request_header_access Link deny all

        Or, to reproduce the old 'http_anonymizer paranoid' feature
        you should use:

                request_header_access Allow allow all
                request_header_access Authorization allow all
                request_header_access WWW-Authenticate allow all
                request_header_access Proxy-Authorization allow all
                request_header_access Proxy-Authenticate allow all
                request_header_access Cache-Control allow all
                request_header_access Content-Encoding allow all
                request_header_access Content-Length allow all
                request_header_access Content-Type allow all
                request_header_access Date allow all
                request_header_access Expires allow all
                request_header_access Host allow all
                request_header_access If-Modified-Since allow all
                request_header_access Last-Modified allow all
                request_header_access Location allow all
                request_header_access Pragma allow all
                request_header_access Accept allow all
                request_header_access Accept-Charset allow all
                request_header_access Accept-Encoding allow all
                request_header_access Accept-Language allow all
                request_header_access Content-Language allow all
                request_header_access Mime-Version allow all
                request_header_access Retry-After allow all
                request_header_access Title allow all
                request_header_access Connection allow all
                request_header_access All deny all

        although many of those are HTTP reply headers, and so should be
        controlled with the reply_header_access directive.

        By default, all headers are allowed (no anonymizing is
        performed).
DOC_END

NAME: reply_header_access
IFDEF: USE_HTTP_VIOLATIONS
TYPE: http_header_access
LOC: Config.reply_header_access
DEFAULT: none
DOC_START
        Usage: reply_header_access header_name allow|deny [!]aclname ...

        WARNING: Doing this VIOLATES the HTTP standard.  Enabling
        this feature could make you liable for problems which it
        causes.

        This option only applies to reply headers, i.e., from the
        server to the client.

        This is the same as request_header_access, but in the other
        direction. Please see request_header_access for detailed
        documentation.

        For example, to achieve the same behavior as the old
        'http_anonymizer standard' option, you should use:

                reply_header_access From deny all
                reply_header_access Referer deny all
                reply_header_access Server deny all
                reply_header_access User-Agent deny all
                reply_header_access WWW-Authenticate deny all
                reply_header_access Link deny all

        Or, to reproduce the old 'http_anonymizer paranoid' feature
        you should use:

                reply_header_access Allow allow all
                reply_header_access Authorization allow all
                reply_header_access WWW-Authenticate allow all
                reply_header_access Proxy-Authorization allow all
                reply_header_access Proxy-Authenticate allow all
                reply_header_access Cache-Control allow all
                reply_header_access Content-Encoding allow all
                reply_header_access Content-Length allow all
                reply_header_access Content-Type allow all
                reply_header_access Date allow all
                reply_header_access Expires allow all
                reply_header_access Host allow all
                reply_header_access If-Modified-Since allow all
                reply_header_access Last-Modified allow all
                reply_header_access Location allow all
                reply_header_access Pragma allow all
                reply_header_access Accept allow all
                reply_header_access Accept-Charset allow all
                reply_header_access Accept-Encoding allow all
                reply_header_access Accept-Language allow all
                reply_header_access Content-Language allow all
                reply_header_access Mime-Version allow all
                reply_header_access Retry-After allow all
                reply_header_access Title allow all
                reply_header_access Connection allow all
                reply_header_access All deny all

        although the HTTP request headers won't be usefully controlled
        by this directive -- see request_header_access for details.

        By default, all headers are allowed (no anonymizing is
        performed).
DOC_END

NAME: request_header_replace header_replace
IFDEF: USE_HTTP_VIOLATIONS
TYPE: http_header_replace
LOC: Config.request_header_access
DEFAULT: none
DOC_START
        Usage:   request_header_replace header_name message
        Example: request_header_replace User-Agent Nutscrape/1.0 (CP/M; 8-bit)

        This option allows you to change the contents of headers
        denied with request_header_access above, by replacing them
        with some fixed string. This replaces the old fake_user_agent
        option.

        This only applies to request headers, not reply headers.

        By default, headers are removed if denied.
DOC_END

NAME: reply_header_replace
IFDEF: USE_HTTP_VIOLATIONS
TYPE: http_header_replace
LOC: Config.reply_header_access
DEFAULT: none
DOC_START
        Usage:   reply_header_replace header_name message
        Example: reply_header_replace Server Foo/1.0

        This option allows you to change the contents of headers
        denied with reply_header_access above, by replacing them
        with some fixed string.

        This only applies to reply headers, not request headers.

        By default, headers are removed if denied.
DOC_END

NAME: request_header_add
TYPE: HeaderWithAclList
LOC: Config.request_header_add
DEFAULT: none
DOC_START
        Usage:   request_header_add field-name field-value acl1 [acl2] ...
        Example: request_header_add X-Client-CA "CA=%ssl::>cert_issuer" all

        This option adds header fields to outgoing HTTP requests (i.e.,
        request headers sent by Squid to the next HTTP hop such as a
        cache peer or an origin server). The option has no effect during
        cache hit detection. The equivalent adaptation vectoring point
        in ICAP terminology is post-cache REQMOD.

        Field-name is a token specifying an HTTP header name. If a
        standard HTTP header name is used, Squid does not check whether
        the new header conflicts with any existing headers or violates
        HTTP rules. If the request to be modified already contains a
        field with the same name, the old field is preserved but the
        header field values are not merged.

        Field-value is either a token or a quoted string. If quoted
        string format is used, then the surrounding quotes are removed
        while escape sequences and %macros are processed.

        In theory, all of the logformat codes can be used as %macros.
        However, unlike logging (which happens at the very end of
        transaction lifetime), the transaction may not yet have enough
        information to expand a macro when the new header value is needed.
        And some information may already be available to Squid but not yet
        committed where the macro expansion code can access it (report
        such instances!). The macro will be expanded into a single dash
        ('-') in such cases. Not all macros have been tested.

        One or more Squid ACLs may be specified to restrict header
        injection to matching requests. As always in squid.conf, all
        ACLs in an option ACL list must be satisfied for the insertion
        to happen. The request_header_add option supports fast ACLs
        only.
DOC_END

NAME: relaxed_header_parser
COMMENT: on|off|warn
TYPE: tristate
LOC: Config.onoff.relaxed_header_parser
DEFAULT: on
DOC_START
        In the default "on" setting Squid accepts certain forms
        of non-compliant HTTP messages where it is unambiguous
        what the sending application intended even if the message
        is not correctly formatted. The messages is then normalized
        to the correct form when forwarded by Squid.

        If set to "warn" then a warning will be emitted in cache.log
        each time such HTTP error is encountered.

        If set to "off" then such HTTP errors will cause the request
        or response to be rejected.
DOC_END

COMMENT_START
 TIMEOUTS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: forward_timeout
COMMENT: time-units
TYPE: time_t
LOC: Config.Timeout.forward
DEFAULT: 4 minutes
DOC_START
        This parameter specifies how long Squid should at most attempt in
        finding a forwarding path for the request before giving up.
DOC_END

NAME: connect_timeout
COMMENT: time-units
TYPE: time_t
LOC: Config.Timeout.connect
DEFAULT: 1 minute
DOC_START
        This parameter specifies how long to wait for the TCP connect to
        the requested server or peer to complete before Squid should
        attempt to find another path where to forward the request.
DOC_END

NAME: peer_connect_timeout
COMMENT: time-units
TYPE: time_t
LOC: Config.Timeout.peer_connect
DEFAULT: 30 seconds
DOC_START
        This parameter specifies how long to wait for a pending TCP
        connection to a peer cache.  The default is 30 seconds.   You
        may also set different timeout values for individual neighbors
        with the 'connect-timeout' option on a 'cache_peer' line.
DOC_END

NAME: read_timeout
COMMENT: time-units
TYPE: time_t
LOC: Config.Timeout.read
DEFAULT: 15 minutes
DOC_START
        The read_timeout is applied on server-side connections.  After
        each successful read(), the timeout will be extended by this
        amount.  If no data is read again after this amount of time,
        the request is aborted and logged with ERR_READ_TIMEOUT.  The
        default is 15 minutes.
DOC_END

NAME: write_timeout
COMMENT: time-units
TYPE: time_t
LOC: Config.Timeout.write
DEFAULT: 15 minutes
DOC_START
        This timeout is tracked for all connections that have data
        available for writing and are waiting for the socket to become
        ready. After each successful write, the timeout is extended by
        the configured amount. If Squid has data to write but the
        connection is not ready for the configured duration, the
        transaction associated with the connection is terminated. The
        default is 15 minutes.
DOC_END

NAME: request_timeout
TYPE: time_t
LOC: Config.Timeout.request
DEFAULT: 5 minutes
DOC_START
        How long to wait for complete HTTP request headers after initial
        connection establishment.
DOC_END

NAME: client_idle_pconn_timeout persistent_request_timeout
TYPE: time_t
LOC: Config.Timeout.clientIdlePconn
DEFAULT: 2 minutes
DOC_START
        How long to wait for the next HTTP request on a persistent
        client connection after the previous request completes.
DOC_END

NAME: client_lifetime
COMMENT: time-units
TYPE: time_t
LOC: Config.Timeout.lifetime
DEFAULT: 1 day
DOC_START
        The maximum amount of time a client (browser) is allowed to
        remain connected to the cache process.  This protects the Cache
        from having a lot of sockets (and hence file descriptors) tied up
        in a CLOSE_WAIT state from remote clients that go away without
        properly shutting down (either because of a network failure or
        because of a poor client implementation).  The default is one
        day, 1440 minutes.

        NOTE:  The default value is intended to be much larger than any
        client would ever need to be connected to your cache.  You
        should probably change client_lifetime only as a last resort.
        If you seem to have many client connections tying up
        filedescriptors, we recommend first tuning the read_timeout,
        request_timeout, persistent_request_timeout and quick_abort values.
DOC_END

NAME: half_closed_clients
TYPE: onoff
LOC: Config.onoff.half_closed_clients
DEFAULT: off
DOC_START
        Some clients may shutdown the sending side of their TCP
        connections, while leaving their receiving sides open.  Sometimes,
        Squid can not tell the difference between a half-closed and a
        fully-closed TCP connection.

        By default, Squid will immediately close client connections when
        read(2) returns "no more data to read."

        Change this option to 'on' and Squid will keep open connections
        until a read(2) or write(2) on the socket returns an error.
        This may show some benefits for reverse proxies. But if not
        it is recommended to leave OFF.
DOC_END

NAME: server_idle_pconn_timeout pconn_timeout
TYPE: time_t
LOC: Config.Timeout.serverIdlePconn
DEFAULT: 1 minute
DOC_START
        Timeout for idle persistent connections to servers and other
        proxies.
DOC_END

NAME: ident_timeout
TYPE: time_t
IFDEF: USE_IDENT
LOC: Ident::TheConfig.timeout
DEFAULT: 10 seconds
DOC_START
        Maximum time to wait for IDENT lookups to complete.

        If this is too high, and you enabled IDENT lookups from untrusted
        users, you might be susceptible to denial-of-service by having
        many ident requests going at once.
DOC_END

NAME: shutdown_lifetime
COMMENT: time-units
TYPE: time_t
LOC: Config.shutdownLifetime
DEFAULT: 30 seconds
DOC_START
        When SIGTERM or SIGHUP is received, the cache is put into
        "shutdown pending" mode until all active sockets are closed.
        This value is the lifetime to set for all open descriptors
        during shutdown mode.  Any active clients after this many
        seconds will receive a 'timeout' message.
DOC_END

COMMENT_START
 ADMINISTRATIVE PARAMETERS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: cache_mgr
TYPE: string
DEFAULT: webmaster
LOC: Config.adminEmail
DOC_START
        Email-address of local cache manager who will receive
        mail if the cache dies.  The default is "webmaster."
DOC_END

NAME: mail_from
TYPE: string
DEFAULT: none
LOC: Config.EmailFrom
DOC_START
        From: email-address for mail sent when the cache dies.
        The default is to use 'appname@unique_hostname'.
        Default appname value is "squid", can be changed into
        src/globals.h before building squid.
DOC_END

NAME: mail_program
TYPE: eol
DEFAULT: mail
LOC: Config.EmailProgram
DOC_START
        Email program used to send mail if the cache dies.
        The default is "mail". The specified program must comply
        with the standard Unix mail syntax:
          mail-program recipient < mailfile

        Optional command line options can be specified.
DOC_END

NAME: cache_effective_user
TYPE: string
DEFAULT: @DEFAULT_CACHE_EFFECTIVE_USER@
LOC: Config.effectiveUser
DOC_START
        If you start Squid as root, it will change its effective/real
        UID/GID to the user specified below.  The default is to change
        to UID of @DEFAULT_CACHE_EFFECTIVE_USER@.
        see also; cache_effective_group
DOC_END

NAME: cache_effective_group
TYPE: string
DEFAULT: none
LOC: Config.effectiveGroup
DOC_START
        Squid sets the GID to the effective user's default group ID
        (taken from the password file) and supplementary group list
        from the groups membership.

        If you want Squid to run with a specific GID regardless of
        the group memberships of the effective user then set this
        to the group (or GID) you want Squid to run as. When set
        all other group privileges of the effective user are ignored
        and only this GID is effective. If Squid is not started as
        root the user starting Squid MUST be member of the specified
        group.

        This option is not recommended by the Squid Team.
        Our preference is for administrators to configure a secure
        user account for squid with UID/GID matching system policies.
DOC_END

NAME: httpd_suppress_version_string
COMMENT: on|off
TYPE: onoff
DEFAULT: off
LOC: Config.onoff.httpd_suppress_version_string
DOC_START
        Suppress Squid version string info in HTTP headers and HTML error pages.
DOC_END

NAME: visible_hostname
TYPE: string
LOC: Config.visibleHostname
DEFAULT: none
DOC_START
        If you want to present a special hostname in error messages, etc,
        define this.  Otherwise, the return value of gethostname()
        will be used. If you have multiple caches in a cluster and
        get errors about IP-forwarding you must set them to have individual
        names with this setting.
DOC_END

NAME: unique_hostname
TYPE: string
LOC: Config.uniqueHostname
DEFAULT: none
DOC_START
        If you want to have multiple machines with the same
        'visible_hostname' you must give each machine a different
        'unique_hostname' so forwarding loops can be detected.
DOC_END

NAME: hostname_aliases
TYPE: wordlist
LOC: Config.hostnameAliases
DEFAULT: none
DOC_START
        A list of other DNS names your cache has.
DOC_END

NAME: umask
TYPE: int
LOC: Config.umask
DEFAULT: 027
DOC_START
        Minimum umask which should be enforced while the proxy
        is running, in addition to the umask set at startup.

        For a traditional octal representation of umasks, start
        your value with 0.
DOC_END

COMMENT_START
 OPTIONS FOR THE CACHE REGISTRATION SERVICE
 -----------------------------------------------------------------------------

        This section contains parameters for the (optional) cache
        announcement service.  This service is provided to help
        cache administrators locate one another in order to join or
        create cache hierarchies.

        An 'announcement' message is sent (via UDP) to the registration
        service by Squid.  By default, the announcement message is NOT
        SENT unless you enable it with 'announce_period' below.

        The announcement message includes your hostname, plus the
        following information from this configuration file:

                http_port
                icp_port
                cache_mgr

        All current information is processed regularly and made
        available on the Web at http://www.ircache.net/Cache/Tracker/.
COMMENT_END

NAME: announce_period
TYPE: time_t
LOC: Config.Announce.period
DEFAULT: 0
DOC_START
        This is how frequently to send cache announcements.  The
        default is `0' which disables sending the announcement
        messages.

        To enable announcing your cache, just set an announce period.

        Example:
                announce_period 1 day
DOC_END

NAME: announce_host
TYPE: string
DEFAULT: tracker.ircache.net
LOC: Config.Announce.host
DOC_NONE

NAME: announce_file
TYPE: string
DEFAULT: none
LOC: Config.Announce.file
DOC_NONE

NAME: announce_port
TYPE: u_short
DEFAULT: 3131
LOC: Config.Announce.port
DOC_START
        announce_host and announce_port set the hostname and port
        number where the registration message will be sent.

        Hostname will default to 'tracker.ircache.net' and port will
        default default to 3131.  If the 'filename' argument is given,
        the contents of that file will be included in the announce
        message.
DOC_END

COMMENT_START
 HTTPD-ACCELERATOR OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: httpd_accel_surrogate_id
TYPE:  string
DEFAULT: none
LOC: Config.Accel.surrogate_id
DOC_START
        Surrogates (http://www.esi.org/architecture_spec_1.0.html)
        need an identification token to allow control targeting. Because
        a farm of surrogates may all perform the same tasks, they may share
        an identification token.

        The default ID is the visible_hostname
DOC_END

NAME: http_accel_surrogate_remote
COMMENT: on|off
TYPE: onoff
DEFAULT: off
LOC: Config.onoff.surrogate_is_remote
DOC_START
        Remote surrogates (such as those in a CDN) honour Surrogate-Control: no-store-remote.
        Set this to on to have squid behave as a remote surrogate.
DOC_END

NAME: esi_parser
IFDEF: USE_SQUID_ESI
COMMENT: libxml2|expat|custom
TYPE: string
LOC: ESIParser::Type
DEFAULT: custom
DOC_START
        ESI markup is not strictly XML compatible. The custom ESI parser
        will give higher performance, but cannot handle non ASCII character
        encodings.
DOC_END

COMMENT_START
 DELAY POOL PARAMETERS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: delay_pools
TYPE: delay_pool_count
DEFAULT: 0
IFDEF: USE_DELAY_POOLS
LOC: Config.Delay
DOC_START
        This represents the number of delay pools to be used.  For example,
        if you have one class 2 delay pool and one class 3 delays pool, you
        have a total of 2 delay pools.
DOC_END

NAME: delay_class
TYPE: delay_pool_class
DEFAULT: none
IFDEF: USE_DELAY_POOLS
LOC: Config.Delay
DOC_START
        This defines the class of each delay pool.  There must be exactly one
        delay_class line for each delay pool.  For example, to define two
        delay pools, one of class 2 and one of class 3, the settings above
        and here would be:

        Example:
            delay_pools 4      # 4 delay pools
            delay_class 1 2    # pool 1 is a class 2 pool
            delay_class 2 3    # pool 2 is a class 3 pool
            delay_class 3 4    # pool 3 is a class 4 pool
            delay_class 4 5    # pool 4 is a class 5 pool

        The delay pool classes are:

                class 1         Everything is limited by a single aggregate
                                bucket.

                class 2         Everything is limited by a single aggregate
                                bucket as well as an "individual" bucket chosen
                                from bits 25 through 32 of the IPv4 address.

                class 3         Everything is limited by a single aggregate
                                bucket as well as a "network" bucket chosen
                                from bits 17 through 24 of the IP address and a
                                "individual" bucket chosen from bits 17 through
                                32 of the IPv4 address.

                class 4         Everything in a class 3 delay pool, with an
                                additional limit on a per user basis. This
                                only takes effect if the username is established
                                in advance - by forcing authentication in your
                                http_access rules.

                class 5         Requests are grouped according their tag (see
                                external_acl's tag= reply).


        Each pool also requires a delay_parameters directive to configure the pool size
        and speed limits used whenever the pool is applied to a request. Along with
        a set of delay_access directives to determine when it is used.

        NOTE: If an IP address is a.b.c.d
                -> bits 25 through 32 are "d"
                -> bits 17 through 24 are "c"
                -> bits 17 through 32 are "c * 256 + d"

        NOTE-2: Due to the use of bitmasks in class 2,3,4 pools they only apply to
                IPv4 traffic. Class 1 and 5 pools may be used with IPv6 traffic.
DOC_END

NAME: delay_access
TYPE: delay_pool_access
DEFAULT: none
IFDEF: USE_DELAY_POOLS
LOC: Config.Delay
DOC_START
        This is used to determine which delay pool a request falls into.

        delay_access is sorted per pool and the matching starts with pool 1,
        then pool 2, ..., and finally pool N. The first delay pool where the
        request is allowed is selected for the request. If it does not allow
        the request to any pool then the request is not delayed (default).

        For example, if you want some_big_clients in delay
        pool 1 and lotsa_little_clients in delay pool 2:

Example:
 delay_access 1 allow some_big_clients
 delay_access 1 deny all
 delay_access 2 allow lotsa_little_clients
 delay_access 2 deny all
 delay_access 3 allow authenticated_clients
DOC_END

NAME: delay_parameters
TYPE: delay_pool_rates
DEFAULT: none
IFDEF: USE_DELAY_POOLS
LOC: Config.Delay
DOC_START
        This defines the parameters for a delay pool.  Each delay pool has
        a number of "buckets" associated with it, as explained in the
        description of delay_class.

        For a class 1 delay pool, the syntax is:
                delay_pools pool 1
                delay_parameters pool aggregate

        For a class 2 delay pool:
                delay_pools pool 2
                delay_parameters pool aggregate individual

        For a class 3 delay pool:
                delay_pools pool 3
                delay_parameters pool aggregate network individual

        For a class 4 delay pool:
                delay_pools pool 4
                delay_parameters pool aggregate network individual user

        For a class 5 delay pool:
                delay_pools pool 5
                delay_parameters pool tagrate

        The option variables are:

                pool            a pool number - ie, a number between 1 and the
                                number specified in delay_pools as used in
                                delay_class lines.

                aggregate       the speed limit parameters for the aggregate bucket
                                (class 1, 2, 3).

                individual      the speed limit parameters for the individual
                                buckets (class 2, 3).

                network         the speed limit parameters for the network buckets
                                (class 3).

                user            the speed limit parameters for the user buckets
                                (class 4).

                tagrate         the speed limit parameters for the tag buckets
                                (class 5).

        A pair of delay parameters is written restore/maximum, where restore is
        the number of bytes (not bits - modem and network speeds are usually
        quoted in bits) per second placed into the bucket, and maximum is the
        maximum number of bytes which can be in the bucket at any time.

        There must be one delay_parameters line for each delay pool.


        For example, if delay pool number 1 is a class 2 delay pool as in the
        above example, and is being used to strictly limit each host to 64Kbit/sec
        (plus overheads), with no overall limit, the line is:

                delay_parameters 1 -1/-1 8000/8000

        Note that 8 x 8000 KByte/sec -> 64Kbit/sec.

        Note that the figure -1 is used to represent "unlimited".


        And, if delay pool number 2 is a class 3 delay pool as in the above
        example, and you want to limit it to a total of 256Kbit/sec (strict limit)
        with each 8-bit network permitted 64Kbit/sec (strict limit) and each
        individual host permitted 4800bit/sec with a bucket maximum size of 64Kbits
        to permit a decent web page to be downloaded at a decent speed
        (if the network is not being limited due to overuse) but slow down
        large downloads more significantly:

                delay_parameters 2 32000/32000 8000/8000 600/8000

        Note that 8 x 32000 KByte/sec -> 256Kbit/sec.
                  8 x  8000 KByte/sec ->  64Kbit/sec.
                  8 x   600 Byte/sec  -> 4800bit/sec.


        Finally, for a class 4 delay pool as in the example - each user will
        be limited to 128Kbits/sec no matter how many workstations they are logged into.:

                delay_parameters 4 32000/32000 8000/8000 600/64000 16000/16000
DOC_END

NAME: delay_initial_bucket_level
COMMENT: (percent, 0-100)
TYPE: u_short
DEFAULT: 50
IFDEF: USE_DELAY_POOLS
LOC: Config.Delay.initial
DOC_START
        The initial bucket percentage is used to determine how much is put
        in each bucket when squid starts, is reconfigured, or first notices
        a host accessing it (in class 2 and class 3, individual hosts and
        networks only have buckets associated with them once they have been
        "seen" by squid).
DOC_END

COMMENT_START
 CLIENT DELAY POOL PARAMETERS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: client_delay_pools
TYPE: client_delay_pool_count
DEFAULT: 0
IFDEF: USE_DELAY_POOLS
LOC: Config.ClientDelay
DOC_START
        This option specifies the number of client delay pools used. It must
        preceed other client_delay_* options.

Example:
 client_delay_pools 2
DOC_END

NAME: client_delay_initial_bucket_level
COMMENT: (percent, 0-no_limit)
TYPE: u_short
DEFAULT: 50
IFDEF: USE_DELAY_POOLS
LOC: Config.ClientDelay.initial
DOC_START
        This option determines the initial bucket size as a percentage of
        max_bucket_size from client_delay_parameters. Buckets are created
        at the time of the "first" connection from the matching IP. Idle
        buckets are periodically deleted up.

        You can specify more than 100 percent but note that such "oversized"
        buckets are not refilled until their size goes down to max_bucket_size
        from client_delay_parameters.

Example:
 client_delay_initial_bucket_level 50
DOC_END

NAME: client_delay_parameters
TYPE: client_delay_pool_rates
DEFAULT: none
IFDEF: USE_DELAY_POOLS
LOC: Config.ClientDelay
DOC_START

        This option configures client-side bandwidth limits using the
        following format:

            client_delay_parameters pool speed_limit max_bucket_size

        pool is an integer ID used for client_delay_access matching.

        speed_limit is bytes added to the bucket per second.

        max_bucket_size is the maximum size of a bucket, enforced after any
        speed_limit additions.

        Please see the delay_parameters option for more information and
        examples.

Example:
 client_delay_parameters 1 1024 2048
 client_delay_parameters 2 51200 16384
DOC_END

NAME: client_delay_access
TYPE: client_delay_pool_access
DEFAULT: none
IFDEF: USE_DELAY_POOLS
LOC: Config.ClientDelay
DOC_START

        This option determines the client-side delay pool for the
        request:

            client_delay_access pool_ID allow|deny acl_name

        All client_delay_access options are checked in their pool ID
        order, starting with pool 1. The first checked pool with allowed
        request is selected for the request. If no ACL matches or there
        are no client_delay_access options, the request bandwidth is not
        limited.

        The ACL-selected pool is then used to find the
        client_delay_parameters for the request. Client-side pools are
        not used to aggregate clients. Clients are always aggregated
        based on their source IP addresses (one bucket per source IP).

        Please see delay_access for more examples.

Example:
 client_delay_access 1 allow low_rate_network
 client_delay_access 2 allow vips_network
DOC_END

COMMENT_START
 WCCPv1 AND WCCPv2 CONFIGURATION OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: wccp_router
TYPE: address
LOC: Config.Wccp.router
DEFAULT: any_addr
IFDEF: USE_WCCP
DOC_START
        Use this option to define your WCCP ``home'' router for
        Squid.

        wccp_router supports a single WCCP(v1) router

        wccp2_router supports multiple WCCPv2 routers

        only one of the two may be used at the same time and defines
        which version of WCCP to use.
DOC_END

NAME: wccp2_router
TYPE: IpAddress_list
LOC: Config.Wccp2.router
DEFAULT: none
IFDEF: USE_WCCPv2
DOC_START
        Use this option to define your WCCP ``home'' router for
        Squid.

        wccp_router supports a single WCCP(v1) router

        wccp2_router supports multiple WCCPv2 routers

        only one of the two may be used at the same time and defines
        which version of WCCP to use.
DOC_END

NAME: wccp_version
TYPE: int
LOC: Config.Wccp.version
DEFAULT: 4
IFDEF: USE_WCCP
DOC_START
        This directive is only relevant if you need to set up WCCP(v1)
        to some very old and end-of-life Cisco routers. In all other
        setups it must be left unset or at the default setting.
        It defines an internal version in the WCCP(v1) protocol,
        with version 4 being the officially documented protocol.

        According to some users, Cisco IOS 11.2 and earlier only
        support WCCP version 3.  If you're using that or an earlier
        version of IOS, you may need to change this value to 3, otherwise
        do not specify this parameter.
DOC_END

NAME: wccp2_rebuild_wait
TYPE: onoff
LOC: Config.Wccp2.rebuildwait
DEFAULT: on
IFDEF: USE_WCCPv2
DOC_START
        If this is enabled Squid will wait for the cache dir rebuild to finish
        before sending the first wccp2 HereIAm packet
DOC_END

NAME: wccp2_forwarding_method
TYPE: wccp2_method
LOC: Config.Wccp2.forwarding_method
DEFAULT: gre
IFDEF: USE_WCCPv2
DOC_START
        WCCP2 allows the setting of forwarding methods between the
        router/switch and the cache.  Valid values are as follows:

        gre - GRE encapsulation (forward the packet in a GRE/WCCP tunnel)
        l2  - L2 redirect (forward the packet using Layer 2/MAC rewriting)

        Currently (as of IOS 12.4) cisco routers only support GRE.
        Cisco switches only support the L2 redirect assignment method.
DOC_END

NAME: wccp2_return_method
TYPE: wccp2_method
LOC: Config.Wccp2.return_method
DEFAULT: gre
IFDEF: USE_WCCPv2
DOC_START
        WCCP2 allows the setting of return methods between the
        router/switch and the cache for packets that the cache
        decides not to handle.  Valid values are as follows:

        gre - GRE encapsulation (forward the packet in a GRE/WCCP tunnel)
        l2  - L2 redirect (forward the packet using Layer 2/MAC rewriting)

        Currently (as of IOS 12.4) cisco routers only support GRE.
        Cisco switches only support the L2 redirect assignment.

        If the "ip wccp redirect exclude in" command has been
        enabled on the cache interface, then it is still safe for
        the proxy server to use a l2 redirect method even if this
        option is set to GRE.
DOC_END

NAME: wccp2_assignment_method
TYPE: wccp2_amethod
LOC: Config.Wccp2.assignment_method
DEFAULT: hash
IFDEF: USE_WCCPv2
DOC_START
        WCCP2 allows the setting of methods to assign the WCCP hash
        Valid values are as follows:

        hash - Hash assignment
        mask - Mask assignment

        As a general rule, cisco routers support the hash assignment method
        and cisco switches support the mask assignment method.
DOC_END

NAME: wccp2_service
TYPE: wccp2_service
LOC: Config.Wccp2.info
DEFAULT_IF_NONE: standard 0
IFDEF: USE_WCCPv2
DOC_START
        WCCP2 allows for multiple traffic services. There are two
        types: "standard" and "dynamic". The standard type defines
        one service id - http (id 0). The dynamic service ids can be from
        51 to 255 inclusive.  In order to use a dynamic service id
        one must define the type of traffic to be redirected; this is done
        using the wccp2_service_info option.

        The "standard" type does not require a wccp2_service_info option,
        just specifying the service id will suffice.

        MD5 service authentication can be enabled by adding
        "password=<password>" to the end of this service declaration.

        Examples:

        wccp2_service standard 0        # for the 'web-cache' standard service
        wccp2_service dynamic 80        # a dynamic service type which will be
                                        # fleshed out with subsequent options.
        wccp2_service standard 0 password=foo
DOC_END

NAME: wccp2_service_info
TYPE: wccp2_service_info
LOC: Config.Wccp2.info
DEFAULT: none
IFDEF: USE_WCCPv2
DOC_START
        Dynamic WCCPv2 services require further information to define the
        traffic you wish to have diverted.

        The format is:

        wccp2_service_info <id> protocol=<protocol> flags=<flag>,<flag>..
            priority=<priority> ports=<port>,<port>..

        The relevant WCCPv2 flags:
        + src_ip_hash, dst_ip_hash
        + source_port_hash, dst_port_hash
        + src_ip_alt_hash, dst_ip_alt_hash
        + src_port_alt_hash, dst_port_alt_hash
        + ports_source

        The port list can be one to eight entries.

        Example:

        wccp2_service_info 80 protocol=tcp flags=src_ip_hash,ports_source
            priority=240 ports=80

        Note: the service id must have been defined by a previous
        'wccp2_service dynamic <id>' entry.
DOC_END

NAME: wccp2_weight
TYPE: int
LOC: Config.Wccp2.weight
DEFAULT: 10000
IFDEF: USE_WCCPv2
DOC_START
        Each cache server gets assigned a set of the destination
        hash proportional to their weight.
DOC_END

NAME: wccp_address
TYPE: address
LOC: Config.Wccp.address
DEFAULT: 0.0.0.0
IFDEF: USE_WCCP
DOC_NONE

NAME: wccp2_address
TYPE: address
LOC: Config.Wccp2.address
DEFAULT: 0.0.0.0
IFDEF: USE_WCCPv2
DOC_START
        Use this option if you require WCCP to use a specific
        interface address.

        The default behavior is to not bind to any specific address.
DOC_END

COMMENT_START
 PERSISTENT CONNECTION HANDLING
 -----------------------------------------------------------------------------

 Also see "pconn_timeout" in the TIMEOUTS section
COMMENT_END

NAME: client_persistent_connections
TYPE: onoff
LOC: Config.onoff.client_pconns
DEFAULT: on
DOC_NONE

NAME: server_persistent_connections
TYPE: onoff
LOC: Config.onoff.server_pconns
DEFAULT: on
DOC_START
        Persistent connection support for clients and servers.  By
        default, Squid uses persistent connections (when allowed)
        with its clients and servers.  You can use these options to
        disable persistent connections with clients and/or servers.
DOC_END

NAME: persistent_connection_after_error
TYPE: onoff
LOC: Config.onoff.error_pconns
DEFAULT: on
DOC_START
        With this directive the use of persistent connections after
        HTTP errors can be disabled. Useful if you have clients
        who fail to handle errors on persistent connections proper.
DOC_END

NAME: detect_broken_pconn
TYPE: onoff
LOC: Config.onoff.detect_broken_server_pconns
DEFAULT: off
DOC_START
        Some servers have been found to incorrectly signal the use
        of HTTP/1.0 persistent connections even on replies not
        compatible, causing significant delays. This server problem
        has mostly been seen on redirects.

        By enabling this directive Squid attempts to detect such
        broken replies and automatically assume the reply is finished
        after 10 seconds timeout.
DOC_END

COMMENT_START
 CACHE DIGEST OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: digest_generation
IFDEF: USE_CACHE_DIGESTS
TYPE: onoff
LOC: Config.onoff.digest_generation
DEFAULT: on
DOC_START
        This controls whether the server will generate a Cache Digest
        of its contents.  By default, Cache Digest generation is
        enabled if Squid is compiled with --enable-cache-digests defined.
DOC_END

NAME: digest_bits_per_entry
IFDEF: USE_CACHE_DIGESTS
TYPE: int
LOC: Config.digest.bits_per_entry
DEFAULT: 5
DOC_START
        This is the number of bits of the server's Cache Digest which
        will be associated with the Digest entry for a given HTTP
        Method and URL (public key) combination.  The default is 5.
DOC_END

NAME: digest_rebuild_period
IFDEF: USE_CACHE_DIGESTS
COMMENT: (seconds)
TYPE: time_t
LOC: Config.digest.rebuild_period
DEFAULT: 1 hour
DOC_START
        This is the wait time between Cache Digest rebuilds.
DOC_END

NAME: digest_rewrite_period
COMMENT: (seconds)
IFDEF: USE_CACHE_DIGESTS
TYPE: time_t
LOC: Config.digest.rewrite_period
DEFAULT: 1 hour
DOC_START
        This is the wait time between Cache Digest writes to
        disk.
DOC_END

NAME: digest_swapout_chunk_size
COMMENT: (bytes)
TYPE: b_size_t
IFDEF: USE_CACHE_DIGESTS
LOC: Config.digest.swapout_chunk_size
DEFAULT: 4096 bytes
DOC_START
        This is the number of bytes of the Cache Digest to write to
        disk at a time.  It defaults to 4096 bytes (4KB), the Squid
        default swap page.
DOC_END

NAME: digest_rebuild_chunk_percentage
COMMENT: (percent, 0-100)
IFDEF: USE_CACHE_DIGESTS
TYPE: int
LOC: Config.digest.rebuild_chunk_percentage
DEFAULT: 10
DOC_START
        This is the percentage of the Cache Digest to be scanned at a
        time.  By default it is set to 10% of the Cache Digest.
DOC_END

COMMENT_START
 SNMP OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: snmp_port
TYPE: u_short
LOC: Config.Port.snmp
DEFAULT: 0
IFDEF: SQUID_SNMP
DOC_START
        The port number where Squid listens for SNMP requests. To enable
        SNMP support set this to a suitable port number. Port number
        3401 is often used for the Squid SNMP agent. By default it's
        set to "0" (disabled)

        Example:
                snmp_port 3401
DOC_END

NAME: snmp_access
TYPE: acl_access
LOC: Config.accessList.snmp
DEFAULT_IF_NONE: deny all
IFDEF: SQUID_SNMP
DOC_START
        Allowing or denying access to the SNMP port.

        All access to the agent is denied by default.
        usage:

        snmp_access allow|deny [!]aclname ...

        This clause only supports fast acl types.
        See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
Example:
 snmp_access allow snmppublic localhost
 snmp_access deny all
DOC_END

NAME: snmp_incoming_address
TYPE: address
LOC: Config.Addrs.snmp_incoming
DEFAULT: any_addr
IFDEF: SQUID_SNMP
DOC_NONE

NAME: snmp_outgoing_address
TYPE: address
LOC: Config.Addrs.snmp_outgoing
DEFAULT: no_addr
IFDEF: SQUID_SNMP
DOC_START
        Just like 'udp_incoming_address', but for the SNMP port.

        snmp_incoming_address   is used for the SNMP socket receiving
                                messages from SNMP agents.
        snmp_outgoing_address   is used for SNMP packets returned to SNMP
                                agents.

        The default snmp_incoming_address is to listen on all
        available network interfaces.

        If snmp_outgoing_address is not set it will use the same socket
        as snmp_incoming_address. Only change this if you want to have
        SNMP replies sent using another address than where this Squid
        listens for SNMP queries.

        NOTE, snmp_incoming_address and snmp_outgoing_address can not have
        the same value since they both use port 3401.
DOC_END

COMMENT_START
 ICP OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: icp_port udp_port
TYPE: u_short
DEFAULT: 0
LOC: Config.Port.icp
DOC_START
        The port number where Squid sends and receives ICP queries to
        and from neighbor caches.  The standard UDP port for ICP is 3130.
        Default is disabled (0).

        Example:
                icp_port @DEFAULT_ICP_PORT@
DOC_END

NAME: htcp_port
IFDEF: USE_HTCP
TYPE: u_short
DEFAULT: 0
LOC: Config.Port.htcp
DOC_START
        The port number where Squid sends and receives HTCP queries to
        and from neighbor caches.  To turn it on you want to set it to
        4827. By default it is set to "0" (disabled).

        Example:
                htcp_port 4827
DOC_END

NAME: log_icp_queries
COMMENT: on|off
TYPE: onoff
DEFAULT: on
LOC: Config.onoff.log_udp
DOC_START
        If set, ICP queries are logged to access.log. You may wish
        do disable this if your ICP load is VERY high to speed things
        up or to simplify log analysis.
DOC_END

NAME: udp_incoming_address
TYPE: address
LOC:Config.Addrs.udp_incoming
DEFAULT: any_addr
DOC_START
        udp_incoming_address    is used for UDP packets received from other
                                caches.

        The default behavior is to not bind to any specific address.

        Only change this if you want to have all UDP queries received on
        a specific interface/address.

        NOTE: udp_incoming_address is used by the ICP, HTCP, and DNS
        modules. Altering it will affect all of them in the same manner.

        see also; udp_outgoing_address

        NOTE, udp_incoming_address and udp_outgoing_address can not
        have the same value since they both use the same port.
DOC_END

NAME: udp_outgoing_address
TYPE: address
LOC: Config.Addrs.udp_outgoing
DEFAULT: no_addr
DOC_START
        udp_outgoing_address    is used for UDP packets sent out to other
                                caches.

        The default behavior is to not bind to any specific address.

        Instead it will use the same socket as udp_incoming_address.
        Only change this if you want to have UDP queries sent using another
        address than where this Squid listens for UDP queries from other
        caches.

        NOTE: udp_outgoing_address is used by the ICP, HTCP, and DNS
        modules. Altering it will affect all of them in the same manner.

        see also; udp_incoming_address

        NOTE, udp_incoming_address and udp_outgoing_address can not
        have the same value since they both use the same port.
DOC_END

NAME: icp_hit_stale
COMMENT: on|off
TYPE: onoff
DEFAULT: off
LOC: Config.onoff.icp_hit_stale
DOC_START
        If you want to return ICP_HIT for stale cache objects, set this
        option to 'on'.  If you have sibling relationships with caches
        in other administrative domains, this should be 'off'.  If you only
        have sibling relationships with caches under your control,
        it is probably okay to set this to 'on'.
        If set to 'on', your siblings should use the option "allow-miss"
        on their cache_peer lines for connecting to you.
DOC_END

NAME: minimum_direct_hops
TYPE: int
DEFAULT: 4
LOC: Config.minDirectHops
DOC_START
        If using the ICMP pinging stuff, do direct fetches for sites
        which are no more than this many hops away.
DOC_END

NAME: minimum_direct_rtt
TYPE: int
DEFAULT: 400
LOC: Config.minDirectRtt
DOC_START
        If using the ICMP pinging stuff, do direct fetches for sites
        which are no more than this many rtt milliseconds away.
DOC_END

NAME: netdb_low
TYPE: int
DEFAULT: 900
LOC: Config.Netdb.low
DOC_NONE

NAME: netdb_high
TYPE: int
DEFAULT: 1000
LOC: Config.Netdb.high
DOC_START
        The low and high water marks for the ICMP measurement
        database.  These are counts, not percents.  The defaults are
        900 and 1000.  When the high water mark is reached, database
        entries will be deleted until the low mark is reached.
DOC_END

NAME: netdb_ping_period
TYPE: time_t
LOC: Config.Netdb.period
DEFAULT: 5 minutes
DOC_START
        The minimum period for measuring a site.  There will be at
        least this much delay between successive pings to the same
        network.  The default is five minutes.
DOC_END

NAME: query_icmp
COMMENT: on|off
TYPE: onoff
DEFAULT: off
LOC: Config.onoff.query_icmp
DOC_START
        If you want to ask your peers to include ICMP data in their ICP
        replies, enable this option.

        If your peer has configured Squid (during compilation) with
        '--enable-icmp' that peer will send ICMP pings to origin server
        sites of the URLs it receives.  If you enable this option the
        ICP replies from that peer will include the ICMP data (if available).
        Then, when choosing a parent cache, Squid will choose the parent with
        the minimal RTT to the origin server.  When this happens, the
        hierarchy field of the access.log will be
        "CLOSEST_PARENT_MISS".  This option is off by default.
DOC_END

NAME: test_reachability
COMMENT: on|off
TYPE: onoff
DEFAULT: off
LOC: Config.onoff.test_reachability
DOC_START
        When this is 'on', ICP MISS replies will be ICP_MISS_NOFETCH
        instead of ICP_MISS if the target host is NOT in the ICMP
        database, or has a zero RTT.
DOC_END

NAME: icp_query_timeout
COMMENT: (msec)
DEFAULT: 0
TYPE: int
LOC: Config.Timeout.icp_query
DOC_START
        Normally Squid will automatically determine an optimal ICP
        query timeout value based on the round-trip-time of recent ICP
        queries.  If you want to override the value determined by
        Squid, set this 'icp_query_timeout' to a non-zero value.  This
        value is specified in MILLISECONDS, so, to use a 2-second
        timeout (the old default), you would write:

                icp_query_timeout 2000
DOC_END

NAME: maximum_icp_query_timeout
COMMENT: (msec)
DEFAULT: 2000
TYPE: int
LOC: Config.Timeout.icp_query_max
DOC_START
        Normally the ICP query timeout is determined dynamically.  But
        sometimes it can lead to very large values (say 5 seconds).
        Use this option to put an upper limit on the dynamic timeout
        value.  Do NOT use this option to always use a fixed (instead
        of a dynamic) timeout value. To set a fixed timeout see the
        'icp_query_timeout' directive.
DOC_END

NAME: minimum_icp_query_timeout
COMMENT: (msec)
DEFAULT: 5
TYPE: int
LOC: Config.Timeout.icp_query_min
DOC_START
        Normally the ICP query timeout is determined dynamically.  But
        sometimes it can lead to very small timeouts, even lower than
        the normal latency variance on your link due to traffic.
        Use this option to put an lower limit on the dynamic timeout
        value.  Do NOT use this option to always use a fixed (instead
        of a dynamic) timeout value. To set a fixed timeout see the
        'icp_query_timeout' directive.
DOC_END

NAME: background_ping_rate
COMMENT: time-units
TYPE: time_t
DEFAULT: 10 seconds
LOC: Config.backgroundPingRate
DOC_START
        Controls how often the ICP pings are sent to siblings that
        have background-ping set.
DOC_END

COMMENT_START
 MULTICAST ICP OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: mcast_groups
TYPE: wordlist
LOC: Config.mcast_group_list
DEFAULT: none
DOC_START
        This tag specifies a list of multicast groups which your server
        should join to receive multicasted ICP queries.

        NOTE!  Be very careful what you put here!  Be sure you
        understand the difference between an ICP _query_ and an ICP
        _reply_.  This option is to be set only if you want to RECEIVE
        multicast queries.  Do NOT set this option to SEND multicast
        ICP (use cache_peer for that).  ICP replies are always sent via
        unicast, so this option does not affect whether or not you will
        receive replies from multicast group members.

        You must be very careful to NOT use a multicast address which
        is already in use by another group of caches.

        If you are unsure about multicast, please read the Multicast
        chapter in the Squid FAQ (http://www.squid-cache.org/FAQ/).

        Usage: mcast_groups 239.128.16.128 224.0.1.20

        By default, Squid doesn't listen on any multicast groups.
DOC_END

NAME: mcast_miss_addr
IFDEF: MULTICAST_MISS_STREAM
TYPE: address
LOC: Config.mcast_miss.addr
DEFAULT: no_addr
DOC_START
        If you enable this option, every "cache miss" URL will
        be sent out on the specified multicast address.

        Do not enable this option unless you are are absolutely
        certain you understand what you are doing.
DOC_END

NAME: mcast_miss_ttl
IFDEF: MULTICAST_MISS_STREAM
TYPE: u_short
LOC: Config.mcast_miss.ttl
DEFAULT: 16
DOC_START
        This is the time-to-live value for packets multicasted
        when multicasting off cache miss URLs is enabled.  By
        default this is set to 'site scope', i.e. 16.
DOC_END

NAME: mcast_miss_port
IFDEF: MULTICAST_MISS_STREAM
TYPE: u_short
LOC: Config.mcast_miss.port
DEFAULT: 3135
DOC_START
        This is the port number to be used in conjunction with
        'mcast_miss_addr'.
DOC_END

NAME: mcast_miss_encode_key
IFDEF: MULTICAST_MISS_STREAM
TYPE: string
LOC: Config.mcast_miss.encode_key
DEFAULT: XXXXXXXXXXXXXXXX
DOC_START
        The URLs that are sent in the multicast miss stream are
        encrypted.  This is the encryption key.
DOC_END

NAME: mcast_icp_query_timeout
COMMENT: (msec)
DEFAULT: 2000
TYPE: int
LOC: Config.Timeout.mcast_icp_query
DOC_START
        For multicast peers, Squid regularly sends out ICP "probes" to
        count how many other peers are listening on the given multicast
        address.  This value specifies how long Squid should wait to
        count all the replies.  The default is 2000 msec, or 2
        seconds.
DOC_END

COMMENT_START
 INTERNAL ICON OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: icon_directory
TYPE: string
LOC: Config.icons.directory
DEFAULT: @DEFAULT_ICON_DIR@
DOC_START
        Where the icons are stored. These are normally kept in
        @DEFAULT_ICON_DIR@
DOC_END

NAME: global_internal_static
TYPE: onoff
LOC: Config.onoff.global_internal_static
DEFAULT: on
DOC_START
        This directive controls is Squid should intercept all requests for
        /squid-internal-static/ no matter which host the URL is requesting
        (default on setting), or if nothing special should be done for
        such URLs (off setting). The purpose of this directive is to make
        icons etc work better in complex cache hierarchies where it may
        not always be possible for all corners in the cache mesh to reach
        the server generating a directory listing.
DOC_END

NAME: short_icon_urls
TYPE: onoff
LOC: Config.icons.use_short_names
DEFAULT: on
DOC_START
        If this is enabled Squid will use short URLs for icons.
        If disabled it will revert to the old behavior of including
        it's own name and port in the URL.

        If you run a complex cache hierarchy with a mix of Squid and
        other proxies you may need to disable this directive.
DOC_END

COMMENT_START
 ERROR PAGE OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: error_directory
TYPE: string
LOC: Config.errorDirectory
DEFAULT: none
DOC_START
        If you wish to create your own versions of the default
        error files to customize them to suit your company copy
        the error/template files to another directory and point
        this tag at them.

        WARNING: This option will disable multi-language support
                 on error pages if used.

        The squid developers are interested in making squid available in
        a wide variety of languages. If you are making translations for a
        language that Squid does not currently provide please consider
        contributing your translation back to the project.
        http://wiki.squid-cache.org/Translations

        The squid developers working on translations are happy to supply drop-in
        translated error files in exchange for any new language contributions.
DOC_END

NAME: error_default_language
IFDEF: USE_ERR_LOCALES
TYPE: string
LOC: Config.errorDefaultLanguage
DEFAULT: none
DOC_START
        Set the default language which squid will send error pages in
        if no existing translation matches the clients language
        preferences.

        If unset (default) generic English will be used.

        The squid developers are interested in making squid available in
        a wide variety of languages. If you are interested in making
        translations for any language see the squid wiki for details.
        http://wiki.squid-cache.org/Translations
DOC_END

NAME: error_log_languages
IFDEF: USE_ERR_LOCALES
TYPE: onoff
LOC: Config.errorLogMissingLanguages
DEFAULT: on
DOC_START
        Log to cache.log what languages users are attempting to
        auto-negotiate for translations.

        Successful negotiations are not logged. Only failures
        have meaning to indicate that Squid may need an upgrade
        of its error page translations.
DOC_END

NAME: err_page_stylesheet
TYPE: string
LOC: Config.errorStylesheet
DEFAULT: @DEFAULT_CONFIG_DIR@/errorpage.css
DOC_START
        CSS Stylesheet to pattern the display of Squid default error pages.

        For information on CSS see http://www.w3.org/Style/CSS/
DOC_END

NAME: err_html_text
TYPE: eol
LOC: Config.errHtmlText
DEFAULT: none
DOC_START
        HTML text to include in error messages.  Make this a "mailto"
        URL to your admin address, or maybe just a link to your
        organizations Web page.

        To include this in your error messages, you must rewrite
        the error template files (found in the "errors" directory).
        Wherever you want the 'err_html_text' line to appear,
        insert a %L tag in the error template file.
DOC_END

NAME: email_err_data
COMMENT: on|off
TYPE: onoff
LOC: Config.onoff.emailErrData
DEFAULT: on
DOC_START
        If enabled, information about the occurred error will be
        included in the mailto links of the ERR pages (if %W is set)
        so that the email body contains the data.
        Syntax is <A HREF="mailto:%w%W">%w</A>
DOC_END

NAME: deny_info
TYPE: denyinfo
LOC: Config.denyInfoList
DEFAULT: none
DOC_START
        Usage:   deny_info err_page_name acl
        or       deny_info http://... acl
        or       deny_info TCP_RESET acl

        This can be used to return a ERR_ page for requests which
        do not pass the 'http_access' rules.  Squid remembers the last
        acl it evaluated in http_access, and if a 'deny_info' line exists
        for that ACL Squid returns a corresponding error page.

        The acl is typically the last acl on the http_access deny line which
        denied access. The exceptions to this rule are:
        - When Squid needs to request authentication credentials. It's then
          the first authentication related acl encountered
        - When none of the http_access lines matches. It's then the last
          acl processed on the last http_access line.
        - When the decision to deny access was made by an adaptation service,
          the acl name is the corresponding eCAP or ICAP service_name.

        NP: If providing your own custom error pages with error_directory
            you may also specify them by your custom file name:
            Example: deny_info ERR_CUSTOM_ACCESS_DENIED bad_guys

        By defaut Squid will send "403 Forbidden". A different 4xx or 5xx
        may be specified by prefixing the file name with the code and a colon.
        e.g. 404:ERR_CUSTOM_ACCESS_DENIED

        Alternatively you can tell Squid to reset the TCP connection
        by specifying TCP_RESET.

        Or you can specify an error URL or URL pattern. The browsers will
        get redirected to the specified URL after formatting tags have
        been replaced. Redirect will be done with 302 or 307 according to
        HTTP/1.1 specs. A different 3xx code may be specified by prefixing
        the URL. e.g. 303:http://example.com/

        URL FORMAT TAGS:
                %a      - username (if available. Password NOT included)
                %B      - FTP path URL
                %e      - Error number
                %E      - Error description
                %h      - Squid hostname
                %H      - Request domain name
                %i      - Client IP Address
                %M      - Request Method
                %o      - Message result from external ACL helper
                %p      - Request Port number
                %P      - Request Protocol name
                %R      - Request URL path
                %T      - Timestamp in RFC 1123 format
                %U      - Full canonical URL from client
                          (HTTPS URLs terminate with *)
                %u      - Full canonical URL from client
                %w      - Admin email from squid.conf
                %x      - Error name
                %%      - Literal percent (%) code

DOC_END

COMMENT_START
 OPTIONS INFLUENCING REQUEST FORWARDING 
 -----------------------------------------------------------------------------
COMMENT_END

NAME: nonhierarchical_direct
TYPE: onoff
LOC: Config.onoff.nonhierarchical_direct
DEFAULT: on
DOC_START
        By default, Squid will send any non-hierarchical requests
        (matching hierarchy_stoplist or not cacheable request type) direct
        to origin servers.

        If you set this to off, Squid will prefer to send these
        requests to parents.

        Note that in most configurations, by turning this off you will only
        add latency to these request without any improvement in global hit
        ratio.

        If you are inside an firewall see never_direct instead of
        this directive.
DOC_END

NAME: prefer_direct
TYPE: onoff
LOC: Config.onoff.prefer_direct
DEFAULT: off
DOC_START
        Normally Squid tries to use parents for most requests. If you for some
        reason like it to first try going direct and only use a parent if
        going direct fails set this to on.

        By combining nonhierarchical_direct off and prefer_direct on you
        can set up Squid to use a parent as a backup path if going direct
        fails.

        Note: If you want Squid to use parents for all requests see
        the never_direct directive. prefer_direct only modifies how Squid
        acts on cacheable requests.
DOC_END

NAME: always_direct
TYPE: acl_access
LOC: Config.accessList.AlwaysDirect
DEFAULT: none
DOC_START
        Usage: always_direct allow|deny [!]aclname ...

        Here you can use ACL elements to specify requests which should
        ALWAYS be forwarded by Squid to the origin servers without using
        any peers.  For example, to always directly forward requests for
        local servers ignoring any parents or siblings you may have use
        something like:

                acl local-servers dstdomain my.domain.net
                always_direct allow local-servers

        To always forward FTP requests directly, use

                acl FTP proto FTP
                always_direct allow FTP

        NOTE: There is a similar, but opposite option named
        'never_direct'.  You need to be aware that "always_direct deny
        foo" is NOT the same thing as "never_direct allow foo".  You
        may need to use a deny rule to exclude a more-specific case of
        some other rule.  Example:

                acl local-external dstdomain external.foo.net
                acl local-servers dstdomain  .foo.net
                always_direct deny local-external
                always_direct allow local-servers

        NOTE: If your goal is to make the client forward the request
        directly to the origin server bypassing Squid then this needs
        to be done in the client configuration. Squid configuration
        can only tell Squid how Squid should fetch the object.

        NOTE: This directive is not related to caching. The replies
        is cached as usual even if you use always_direct. To not cache
        the replies see the 'cache' directive.

        This clause supports both fast and slow acl types.
        See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
DOC_END

NAME: never_direct
TYPE: acl_access
LOC: Config.accessList.NeverDirect
DEFAULT: none
DOC_START
        Usage: never_direct allow|deny [!]aclname ...

        never_direct is the opposite of always_direct.  Please read
        the description for always_direct if you have not already.

        With 'never_direct' you can use ACL elements to specify
        requests which should NEVER be forwarded directly to origin
        servers.  For example, to force the use of a proxy for all
        requests, except those in your local domain use something like:

                acl local-servers dstdomain .foo.net
                never_direct deny local-servers
                never_direct allow all

        or if Squid is inside a firewall and there are local intranet
        servers inside the firewall use something like:

                acl local-intranet dstdomain .foo.net
                acl local-external dstdomain external.foo.net
                always_direct deny local-external
                always_direct allow local-intranet
                never_direct allow all

        This clause supports both fast and slow acl types.
        See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
DOC_END

COMMENT_START
 ADVANCED NETWORKING OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: incoming_udp_average incoming_icp_average
TYPE: int
DEFAULT: 6
LOC: Config.comm_incoming.udp.average
DOC_START
        Heavy voodoo here.  I can't even believe you are reading this.
        Are you crazy?  Don't even think about adjusting these unless
        you understand the algorithms in comm_select.c first!
DOC_END

NAME: incoming_tcp_average  incoming_http_average
TYPE: int
DEFAULT: 4
LOC: Config.comm_incoming.tcp.average
DOC_START
        Heavy voodoo here.  I can't even believe you are reading this.
        Are you crazy?  Don't even think about adjusting these unless
        you understand the algorithms in comm_select.c first!
DOC_END

NAME: incoming_dns_average
TYPE: int
DEFAULT: 4
LOC: Config.comm_incoming.dns.average
DOC_START
        Heavy voodoo here.  I can't even believe you are reading this.
        Are you crazy?  Don't even think about adjusting these unless
        you understand the algorithms in comm_select.c first!
DOC_END

NAME: min_udp_poll_cnt min_icp_poll_cnt
TYPE: int
DEFAULT: 8
LOC: Config.comm_incoming.udp.min_poll
DOC_START
        Heavy voodoo here.  I can't even believe you are reading this.
        Are you crazy?  Don't even think about adjusting these unless
        you understand the algorithms in comm_select.c first!
DOC_END

NAME: min_dns_poll_cnt
TYPE: int
DEFAULT: 8
LOC: Config.comm_incoming.dns.min_poll
DOC_START
        Heavy voodoo here.  I can't even believe you are reading this.
        Are you crazy?  Don't even think about adjusting these unless
        you understand the algorithms in comm_select.c first!
DOC_END

NAME: min_tcp_poll_cnt min_http_poll_cnt
TYPE: int
DEFAULT: 8
LOC: Config.comm_incoming.tcp.min_poll
DOC_START
        Heavy voodoo here.  I can't even believe you are reading this.
        Are you crazy?  Don't even think about adjusting these unless
        you understand the algorithms in comm_select.c first!
DOC_END

NAME: accept_filter
TYPE: string
DEFAULT: none
LOC: Config.accept_filter
DOC_START
        FreeBSD:

        The name of an accept(2) filter to install on Squid's
        listen socket(s).  This feature is perhaps specific to
        FreeBSD and requires support in the kernel.

        The 'httpready' filter delays delivering new connections
        to Squid until a full HTTP request has been received.
        See the accf_http(9) man page for details.

        The 'dataready' filter delays delivering new connections
        to Squid until there is some data to process.
        See the accf_dataready(9) man page for details.

        Linux:
        
        The 'data' filter delays delivering of new connections
        to Squid until there is some data to process by TCP_ACCEPT_DEFER.
        You may optionally specify a number of seconds to wait by
        'data=N' where N is the number of seconds. Defaults to 30
        if not specified.  See the tcp(7) man page for details.
EXAMPLE:
# FreeBSD
accept_filter httpready
# Linux
accept_filter data
DOC_END

NAME: client_ip_max_connections
TYPE: int
LOC: Config.client_ip_max_connections
DEFAULT: -1
DOC_START
        Set an absolute limit on the number of connections a single
        client IP can use. Any more than this and Squid will begin to drop
        new connections from the client until it closes some links.

        Note that this is a global limit. It affects all HTTP, HTCP, Gopher and FTP
        connections from the client. For finer control use the ACL access controls.

        Requires client_db to be enabled (the default).

        WARNING: This may noticably slow down traffic received via external proxies
        or NAT devices and cause them to rebound error messages back to their clients.
DOC_END

NAME: tcp_recv_bufsize
COMMENT: (bytes)
TYPE: b_size_t
DEFAULT: 0 bytes
LOC: Config.tcpRcvBufsz
DOC_START
        Size of receive buffer to set for TCP sockets.  Probably just
        as easy to change your kernel's default.  Set to zero to use
        the default buffer size.
DOC_END

COMMENT_START
 ICAP OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: icap_enable
TYPE: onoff
IFDEF: ICAP_CLIENT
COMMENT: on|off
LOC: Adaptation::Icap::TheConfig.onoff
DEFAULT: off
DOC_START
        If you want to enable the ICAP module support, set this to on.
DOC_END

NAME: icap_connect_timeout
TYPE: time_t
DEFAULT: none
LOC: Adaptation::Icap::TheConfig.connect_timeout_raw
IFDEF: ICAP_CLIENT
DOC_START
        This parameter specifies how long to wait for the TCP connect to
        the requested ICAP server to complete before giving up and either
        terminating the HTTP transaction or bypassing the failure.

        The default for optional services is peer_connect_timeout.
        The default for essential services is connect_timeout.
        If this option is explicitly set, its value applies to all services.
DOC_END

NAME: icap_io_timeout
COMMENT: time-units
TYPE: time_t
DEFAULT: none
LOC: Adaptation::Icap::TheConfig.io_timeout_raw
IFDEF: ICAP_CLIENT
DOC_START
        This parameter specifies how long to wait for an I/O activity on
        an established, active ICAP connection before giving up and
        either terminating the HTTP transaction or bypassing the
        failure.

        The default is read_timeout.
DOC_END

NAME: icap_service_failure_limit
COMMENT: limit [in memory-depth time-units]
TYPE: icap_service_failure_limit
IFDEF: ICAP_CLIENT
LOC: Adaptation::Icap::TheConfig
DEFAULT: 10
DOC_START
        The limit specifies the number of failures that Squid tolerates
        when establishing a new TCP connection with an ICAP service. If
        the number of failures exceeds the limit, the ICAP service is
        not used for new ICAP requests until it is time to refresh its
        OPTIONS.

        A negative value disables the limit. Without the limit, an ICAP
        service will not be considered down due to connectivity failures
        between ICAP OPTIONS requests.

        Squid forgets ICAP service failures older than the specified
        value of memory-depth. The memory fading algorithm 
        is approximate because Squid does not remember individual 
        errors but groups them instead, splitting the option
        value into ten time slots of equal length.

        When memory-depth is 0 and by default this option has no 
        effect on service failure expiration.

        Squid always forgets failures when updating service settings
        using an ICAP OPTIONS transaction, regardless of this option
        setting.

        For example,
                # suspend service usage after 10 failures in 5 seconds:
                icap_service_failure_limit 10 in 5 seconds
DOC_END

NAME: icap_service_revival_delay
TYPE: int
IFDEF: ICAP_CLIENT
LOC: Adaptation::Icap::TheConfig.service_revival_delay
DEFAULT: 180
DOC_START
        The delay specifies the number of seconds to wait after an ICAP
        OPTIONS request failure before requesting the options again. The
        failed ICAP service is considered "down" until fresh OPTIONS are
        fetched.

        The actual delay cannot be smaller than the hardcoded minimum
        delay of 30 seconds.
DOC_END

NAME: icap_preview_enable
TYPE: onoff
IFDEF: ICAP_CLIENT
COMMENT: on|off
LOC: Adaptation::Icap::TheConfig.preview_enable
DEFAULT: on
DOC_START
        The ICAP Preview feature allows the ICAP server to handle the
        HTTP message by looking only at the beginning of the message body
        or even without receiving the body at all. In some environments, 
        previews greatly speedup ICAP processing.

        During an ICAP OPTIONS transaction, the server may tell Squid what
        HTTP messages should be previewed and how big the preview should be.
        Squid will not use Preview if the server did not request one.

        To disable ICAP Preview for all ICAP services, regardless of
        individual ICAP server OPTIONS responses, set this option to "off".
Example:
icap_preview_enable off
DOC_END

NAME: icap_preview_size
TYPE: int
IFDEF: ICAP_CLIENT
LOC: Adaptation::Icap::TheConfig.preview_size
DEFAULT: -1
DOC_START
        The default size of preview data to be sent to the ICAP server.
        -1 means no preview. This value might be overwritten on a per server
        basis by OPTIONS requests.
DOC_END

NAME: icap_206_enable
TYPE: onoff
IFDEF: ICAP_CLIENT
COMMENT: on|off
LOC: Adaptation::Icap::TheConfig.allow206_enable
DEFAULT: on
DOC_START
        206 (Partial Content) responses is an ICAP extension that allows the
        ICAP agents to optionally combine adapted and original HTTP message
        content. The decision to combine is postponed until the end of the
        ICAP response. Squid supports Partial Content extension by default.

        Activation of the Partial Content extension is negotiated with each
        ICAP service during OPTIONS exchange. Most ICAP servers should handle
        negotation correctly even if they do not support the extension, but
        some might fail. To disable Partial Content support for all ICAP
        services and to avoid any negotiation, set this option to "off".

        Example:
            icap_206_enable off
DOC_END

NAME: icap_default_options_ttl
TYPE: int
IFDEF: ICAP_CLIENT
LOC: Adaptation::Icap::TheConfig.default_options_ttl
DEFAULT: 60
DOC_START
        The default TTL value for ICAP OPTIONS responses that don't have
        an Options-TTL header.
DOC_END

NAME: icap_persistent_connections
TYPE: onoff
IFDEF: ICAP_CLIENT
COMMENT: on|off
LOC: Adaptation::Icap::TheConfig.reuse_connections
DEFAULT: on
DOC_START
        Whether or not Squid should use persistent connections to
        an ICAP server.
DOC_END

NAME: adaptation_send_client_ip icap_send_client_ip
TYPE: onoff
IFDEF: USE_ADAPTATION
COMMENT: on|off
LOC: Adaptation::Config::send_client_ip
DEFAULT: off
DOC_START
        If enabled, Squid shares HTTP client IP information with adaptation
        services. For ICAP, Squid adds the X-Client-IP header to ICAP requests.
        For eCAP, Squid sets the libecap::metaClientIp transaction option.

        See also: adaptation_uses_indirect_client
DOC_END

NAME: adaptation_send_username icap_send_client_username
TYPE: onoff
IFDEF: USE_ADAPTATION
COMMENT: on|off
LOC: Adaptation::Config::send_username
DEFAULT: off
DOC_START
        This sends authenticated HTTP client username (if available) to
        the adaptation service.

        For ICAP, the username value is encoded based on the
        icap_client_username_encode option and is sent using the header
        specified by the icap_client_username_header option.
DOC_END

NAME: icap_client_username_header
TYPE: string
IFDEF: ICAP_CLIENT
LOC: Adaptation::Icap::TheConfig.client_username_header
DEFAULT: X-Client-Username
DOC_START
        ICAP request header name to use for adaptation_send_username.
DOC_END

NAME: icap_client_username_encode
TYPE: onoff
IFDEF: ICAP_CLIENT
COMMENT: on|off
LOC: Adaptation::Icap::TheConfig.client_username_encode
DEFAULT: off
DOC_START
        Whether to base64 encode the authenticated client username.
DOC_END

NAME: icap_service
TYPE: icap_service_type
IFDEF: ICAP_CLIENT
LOC: Adaptation::Icap::TheConfig
DEFAULT: none
DOC_START
        Defines a single ICAP service using the following format:

        icap_service id vectoring_point uri [option ...]

        id: ID
                an opaque identifier or name which is used to direct traffic to
                this specific service. Must be unique among all adaptation
                services in squid.conf.

        vectoring_point: reqmod_precache|reqmod_postcache|respmod_precache|respmod_postcache
                This specifies at which point of transaction processing the
                ICAP service should be activated. *_postcache vectoring points
                are not yet supported.

        uri: icap://servername:port/servicepath
                ICAP server and service location.

        ICAP does not allow a single service to handle both REQMOD and RESPMOD
        transactions. Squid does not enforce that requirement. You can specify
        services with the same service_url and different vectoring_points. You
        can even specify multiple identical services as long as their
        service_names differ.


        Service options are separated by white space. ICAP services support
        the following name=value options:

        bypass=on|off|1|0
                If set to 'on' or '1', the ICAP service is treated as
                optional. If the service cannot be reached or malfunctions,
                Squid will try to ignore any errors and process the message as
                if the service was not enabled. No all ICAP errors can be
                bypassed.  If set to 0, the ICAP service is treated as
                essential and all ICAP errors will result in an error page
                returned to the HTTP client.

                Bypass is off by default: services are treated as essential.

        routing=on|off|1|0
                If set to 'on' or '1', the ICAP service is allowed to
                dynamically change the current message adaptation plan by
                returning a chain of services to be used next. The services
                are specified using the X-Next-Services ICAP response header
                value, formatted as a comma-separated list of service names.
                Each named service should be configured in squid.conf. Other
                services are ignored. An empty X-Next-Services value results
                in an empty plan which ends the current adaptation.

                Dynamic adaptation plan may cross or cover multiple supported
                vectoring points in their natural processing order.

                Routing is not allowed by default: the ICAP X-Next-Services
                response header is ignored.

        ipv6=on|off
                Only has effect on split-stack systems. The default on those systems
                is to use IPv4-only connections. When set to 'on' this option will
                make Squid use IPv6-only connections to contact this ICAP service.

        on-overload=block|bypass|wait|force
                If the service Max-Connections limit has been reached, do
                one of the following for each new ICAP transaction:
                  * block:  send an HTTP error response to the client
                  * bypass: ignore the "over-connected" ICAP service
                  * wait:   wait (in a FIFO queue) for an ICAP connection slot
                  * force:  proceed, ignoring the Max-Connections limit 

                In SMP mode with N workers, each worker assumes the service
                connection limit is Max-Connections/N, even though not all
                workers may use a given service.

                The default value is "bypass" if service is bypassable,
                otherwise it is set to "wait".
                

        max-conn=number
                Use the given number as the Max-Connections limit, regardless
                of the Max-Connections value given by the service, if any.

        Older icap_service format without optional named parameters is
        deprecated but supported for backward compatibility.

Example:
icap_service svcBlocker reqmod_precache icap://icap1.mydomain.net:1344/reqmod bypass=0
icap_service svcLogger reqmod_precache icap://icap2.mydomain.net:1344/respmod routing=on
DOC_END

NAME: icap_class
TYPE: icap_class_type
IFDEF: ICAP_CLIENT
LOC: none
DEFAULT: none
DOC_START
        This deprecated option was documented to define an ICAP service
        chain, even though it actually defined a set of similar, redundant
        services, and the chains were not supported. 

        To define a set of redundant services, please use the
        adaptation_service_set directive. For service chains, use
        adaptation_service_chain.
DOC_END

NAME: icap_access
TYPE: icap_access_type
IFDEF: ICAP_CLIENT
LOC: none
DEFAULT: none
DOC_START
        This option is deprecated. Please use adaptation_access, which
        has the same ICAP functionality, but comes with better
        documentation, and eCAP support.
DOC_END

COMMENT_START
 eCAP OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: ecap_enable
TYPE: onoff
IFDEF: USE_ECAP
COMMENT: on|off
LOC: Adaptation::Ecap::TheConfig.onoff
DEFAULT: off
DOC_START
        Controls whether eCAP support is enabled.
DOC_END

NAME: ecap_service
TYPE: ecap_service_type
IFDEF: USE_ECAP
LOC: Adaptation::Ecap::TheConfig
DEFAULT: none
DOC_START
        Defines a single eCAP service

        ecap_service id vectoring_point uri [option ...]

        id: ID
                an opaque identifier or name which is used to direct traffic to
                this specific service. Must be unique among all adaptation
                services in squid.conf.

        vectoring_point: reqmod_precache|reqmod_postcache|respmod_precache|respmod_postcache
                This specifies at which point of transaction processing the
                eCAP service should be activated. *_postcache vectoring points
                are not yet supported.

        uri: ecap://vendor/service_name?custom&cgi=style&parameters=optional
                Squid uses the eCAP service URI to match this configuration
                line with one of the dynamically loaded services. Each loaded
                eCAP service must have a unique URI. Obtain the right URI from
                the service provider.


        Service options are separated by white space. eCAP services support
        the following name=value options:

        bypass=on|off|1|0
                If set to 'on' or '1', the eCAP service is treated as optional.
                If the service cannot be reached or malfunctions, Squid will try
                to ignore any errors and process the message as if the service
                was not enabled. No all eCAP errors can be bypassed.
                If set to 'off' or '0', the eCAP service is treated as essential
                and all eCAP errors will result in an error page returned to the
                HTTP client.

                Bypass is off by default: services are treated as essential.

        routing=on|off|1|0
                If set to 'on' or '1', the eCAP service is allowed to
                dynamically change the current message adaptation plan by
                returning a chain of services to be used next.

                Dynamic adaptation plan may cross or cover multiple supported
                vectoring points in their natural processing order.

                Routing is not allowed by default.

        Older ecap_service format without optional named parameters is
        deprecated but supported for backward compatibility.


Example:
ecap_service s1 reqmod_precache ecap://filters.R.us/leakDetector?on_error=block bypass=off
ecap_service s2 respmod_precache ecap://filters.R.us/virusFilter config=/etc/vf.cfg bypass=on
DOC_END

NAME: loadable_modules
TYPE: wordlist
IFDEF: USE_LOADABLE_MODULES
LOC: Config.loadable_module_names
DEFAULT: none
DOC_START
        Instructs Squid to load the specified dynamic module(s) or activate
        preloaded module(s).
Example:
loadable_modules @DEFAULT_PREFIX@/lib/MinimalAdapter.so
DOC_END

COMMENT_START
 MESSAGE ADAPTATION OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: adaptation_service_set
TYPE: adaptation_service_set_type
IFDEF: USE_ADAPTATION
LOC: none
DEFAULT: none
DOC_START

        Configures an ordered set of similar, redundant services. This is
        useful when hot standby or backup adaptation servers are available.

            adaptation_service_set set_name service_name1 service_name2 ...

        The named services are used in the set declaration order. The first
        applicable adaptation service from the set is used first. The next
        applicable service is tried if and only if the transaction with the
        previous service fails and the message waiting to be adapted is still
        intact.

        When adaptation starts, broken services are ignored as if they were
        not a part of the set. A broken service is a down optional service.

        The services in a set must be attached to the same vectoring point
        (e.g., pre-cache) and use the same adaptation method (e.g., REQMOD).

        If all services in a set are optional then adaptation failures are
        bypassable. If all services in the set are essential, then a
        transaction failure with one service may still be retried using
        another service from the set, but when all services fail, the master
        transaction fails as well.

        A set may contain a mix of optional and essential services, but that
        is likely to lead to surprising results because broken services become
        ignored (see above), making previously bypassable failures fatal.
        Technically, it is the bypassability of the last failed service that
        matters.

        See also: adaptation_access adaptation_service_chain

Example:
adaptation_service_set svcBlocker urlFilterPrimary urlFilterBackup
adaptation service_set svcLogger loggerLocal loggerRemote
DOC_END

NAME: adaptation_service_chain
TYPE: adaptation_service_chain_type
IFDEF: USE_ADAPTATION
LOC: none
DEFAULT: none
DOC_START

        Configures a list of complementary services that will be applied
        one-by-one, forming an adaptation chain or pipeline. This is useful
        when Squid must perform different adaptations on the same message.

            adaptation_service_chain chain_name service_name1 svc_name2 ...

        The named services are used in the chain declaration order. The first
        applicable adaptation service from the chain is used first. The next
        applicable service is applied to the successful adaptation results of
        the previous service in the chain.

        When adaptation starts, broken services are ignored as if they were
        not a part of the chain. A broken service is a down optional service.

        Request satisfaction terminates the adaptation chain because Squid
        does not currently allow declaration of RESPMOD services at the
        "reqmod_precache" vectoring point (see icap_service or ecap_service).

        The services in a chain must be attached to the same vectoring point
        (e.g., pre-cache) and use the same adaptation method (e.g., REQMOD).

        A chain may contain a mix of optional and essential services. If an
        essential adaptation fails (or the failure cannot be bypassed for
        other reasons), the master transaction fails. Otherwise, the failure
        is bypassed as if the failed adaptation service was not in the chain.

        See also: adaptation_access adaptation_service_set

Example:
adaptation_service_chain svcRequest requestLogger urlFilter leakDetector
DOC_END

NAME: adaptation_access
TYPE: adaptation_access_type
IFDEF: USE_ADAPTATION
LOC: none
DEFAULT: none
DOC_START
        Sends an HTTP transaction to an ICAP or eCAP adaptation service.

        adaptation_access service_name allow|deny [!]aclname...
        adaptation_access set_name     allow|deny [!]aclname...

        At each supported vectoring point, the adaptation_access
        statements are processed in the order they appear in this
        configuration file. Statements pointing to the following services
        are ignored (i.e., skipped without checking their ACL):

            - services serving different vectoring points
            - "broken-but-bypassable" services
            - "up" services configured to ignore such transactions
              (e.g., based on the ICAP Transfer-Ignore header).

        When a set_name is used, all services in the set are checked
        using the same rules, to find the first applicable one. See
        adaptation_service_set for details.

        If an access list is checked and there is a match, the
        processing stops: For an "allow" rule, the corresponding
        adaptation service is used for the transaction. For a "deny"
        rule, no adaptation service is activated.

        It is currently not possible to apply more than one adaptation
        service at the same vectoring point to the same HTTP transaction.

        See also: icap_service and ecap_service

Example:
adaptation_access service_1 allow all
DOC_END

NAME: adaptation_service_iteration_limit
TYPE: int
IFDEF: USE_ADAPTATION
LOC: Adaptation::Config::service_iteration_limit
DEFAULT: 16
DOC_START
        Limits the number of iterations allowed when applying adaptation
        services to a message. If your longest adaptation set or chain
        may have more than 16 services, increase the limit beyond its
        default value of 16. If detecting infinite iteration loops sooner
        is critical, make the iteration limit match the actual number
        of services in your longest adaptation set or chain.

        Infinite adaptation loops are most likely with routing services.

        See also: icap_service routing=1
DOC_END

NAME: adaptation_masterx_shared_names
TYPE: string
IFDEF: USE_ADAPTATION
LOC: Adaptation::Config::masterx_shared_name
DEFAULT: none
DOC_START
        For each master transaction (i.e., the HTTP request and response
        sequence, including all related ICAP and eCAP exchanges), Squid
        maintains a table of metadata. The table entries are (name, value)
        pairs shared among eCAP and ICAP exchanges. The table is destroyed
        with the master transaction.

        This option specifies the table entry names that Squid must accept
        from and forward to the adaptation transactions.

        An ICAP REQMOD or RESPMOD transaction may set an entry in the 
        shared table by returning an ICAP header field with a name 
        specified in adaptation_masterx_shared_names.

        An eCAP REQMOD or RESPMOD transaction may set an entry in the
        shared table by implementing the libecap::visitEachOption() API
        to provide an option with a name specified in
        adaptation_masterx_shared_names.

        Squid will store and forward the set entry to subsequent adaptation
        transactions within the same master transaction scope.

        Only one shared entry name is supported at this time.

Example:
# share authentication information among ICAP services
adaptation_masterx_shared_names X-Subscriber-ID
DOC_END

NAME: adaptation_meta
TYPE: adaptation_meta_type
IFDEF: USE_ADAPTATION
LOC: Adaptation::Config::metaHeaders
DEFAULT: none
DOC_START
        This option allows Squid administrator to add custom ICAP request
        headers or eCAP options to Squid ICAP requests or eCAP transactions.
        Use it to pass custom authentication tokens and other
        transaction-state related meta information to an ICAP/eCAP service.
        
        The addition of a meta header is ACL-driven:
                adaptation_meta name value [!]aclname ...
        
        Processing for a given header name stops after the first ACL list match.
        Thus, it is impossible to add two headers with the same name. If no ACL
        lists match for a given header name, no such header is added. For 
        example:
        
                # do not debug transactions except for those that need debugging
                adaptation_meta X-Debug 1 needs_debugging
        
                # log all transactions except for those that must remain secret
                adaptation_meta X-Log 1 !keep_secret
        
                # mark transactions from users in the "G 1" group
                adaptation_meta X-Authenticated-Groups "G 1" authed_as_G1
        
        The "value" parameter may be a regular squid.conf token or a "double
        quoted string". Within the quoted string, use backslash (\) to escape
        any character, which is currently only useful for escaping backslashes
        and double quotes. For example,
            "this string has one backslash (\\) and two \"quotes\""
DOC_END

NAME: icap_retry
TYPE: acl_access
IFDEF: ICAP_CLIENT
LOC: Adaptation::Icap::TheConfig.repeat
DEFAULT_IF_NONE: deny all
DOC_START
        This ACL determines which retriable ICAP transactions are
        retried. Transactions that received a complete ICAP response
        and did not have to consume or produce HTTP bodies to receive
        that response are usually retriable.

        icap_retry allow|deny [!]aclname ...

        Squid automatically retries some ICAP I/O timeouts and errors
        due to persistent connection race conditions.

        See also: icap_retry_limit
DOC_END

NAME: icap_retry_limit
TYPE: int
IFDEF: ICAP_CLIENT
LOC: Adaptation::Icap::TheConfig.repeat_limit
DEFAULT: 0
DOC_START
        Limits the number of retries allowed. When set to zero (default),
        no retries are allowed.

        Communication errors due to persistent connection race
        conditions are unavoidable, automatically retried, and do not
        count against this limit.

        See also: icap_retry
DOC_END


COMMENT_START
 DNS OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: check_hostnames
TYPE: onoff
DEFAULT: off
LOC: Config.onoff.check_hostnames
DOC_START
        For security and stability reasons Squid can check
        hostnames for Internet standard RFC compliance. If you want
        Squid to perform these checks turn this directive on.
DOC_END

NAME: allow_underscore
TYPE: onoff
DEFAULT: on
LOC: Config.onoff.allow_underscore
DOC_START
        Underscore characters is not strictly allowed in Internet hostnames
        but nevertheless used by many sites. Set this to off if you want
        Squid to be strict about the standard.
        This check is performed only when check_hostnames is set to on.
DOC_END

NAME: cache_dns_program
TYPE: string
IFDEF: USE_DNSHELPER
DEFAULT: @DEFAULT_DNSSERVER@
LOC: Config.Program.dnsserver
DOC_START
        Specify the location of the executable for dnslookup process.
DOC_END

NAME: dns_children
TYPE: HelperChildConfig
IFDEF: USE_DNSHELPER
DEFAULT: 32 startup=1 idle=1
LOC: Config.dnsChildren
DOC_START
        The maximum number of processes spawn to service DNS name lookups.
        If you limit it too few Squid will have to wait for them to process
        a backlog of requests, slowing it down. If you allow too many they
        will use RAM and other system resources noticably.
        The maximum this may be safely set to is 32.
        
        The startup= and idle= options allow some measure of skew in your
        tuning.
        
                startup=
        
        Sets a minimum of how many processes are to be spawned when Squid
        starts or reconfigures. When set to zero the first request will
        cause spawning of the first child process to handle it.
        
        Starting too few will cause an initial slowdown in traffic as Squid
        attempts to simultaneously spawn enough processes to cope.
        
                idle=
        
        Sets a minimum of how many processes Squid is to try and keep available
        at all times. When traffic begins to rise above what the existing
        processes can handle this many more will be spawned up to the maximum
        configured. A minimum setting of 1 is required.
DOC_END

NAME: dns_retransmit_interval
TYPE: time_msec
DEFAULT: 5 seconds
LOC: Config.Timeout.idns_retransmit
IFDEF: !USE_DNSHELPER
DOC_START
        Initial retransmit interval for DNS queries. The interval is
        doubled each time all configured DNS servers have been tried.
DOC_END

NAME: dns_timeout
TYPE: time_msec
DEFAULT: 30 seconds
LOC: Config.Timeout.idns_query
IFDEF: !USE_DNSHELPER
DOC_START
        DNS Query timeout. If no response is received to a DNS query
        within this time all DNS servers for the queried domain
        are assumed to be unavailable.
DOC_END

NAME: dns_packet_max
TYPE: b_ssize_t
DEFAULT: none
LOC: Config.dns.packet_max
IFDEF: !USE_DNSHELPER
DOC_START
        Maximum number of bytes packet size to advertise via EDNS.
        Set to "none" to disable EDNS large packet support.
        
        For legacy reasons DNS UDP replies will default to 512 bytes which
        is too small for many responses. EDNS provides a means for Squid to
        negotiate receiving larger responses back immediately without having
        to failover with repeat requests. Responses larger than this limit
        will retain the old behaviour of failover to TCP DNS.
        
        Squid has no real fixed limit internally, but allowing packet sizes
        over 1500 bytes requires network jumbogram support and is usually not
        necessary.
        
        WARNING: The RFC also indicates that some older resolvers will reply
        with failure of the whole request if the extension is added. Some
        resolvers have already been identified which will reply with mangled
        EDNS response on occasion. Usually in response to many-KB jumbogram
        sizes being advertised by Squid.
        Squid will currently treat these both as an unable-to-resolve domain
        even if it would be resolvable without EDNS.
DOC_END

NAME: dns_defnames
COMMENT: on|off
TYPE: onoff
DEFAULT: off
LOC: Config.onoff.res_defnames
DOC_START
        Normally the RES_DEFNAMES resolver option is disabled
        (see res_init(3)).  This prevents caches in a hierarchy
        from interpreting single-component hostnames locally.  To allow
        Squid to handle single-component names, enable this option.
DOC_END

NAME: dns_nameservers
TYPE: wordlist
DEFAULT: none
LOC: Config.dns_nameservers
DOC_START
        Use this if you want to specify a list of DNS name servers
        (IP addresses) to use instead of those given in your
        /etc/resolv.conf file.
        On Windows platforms, if no value is specified here or in
        the /etc/resolv.conf file, the list of DNS name servers are
        taken from the Windows registry, both static and dynamic DHCP
        configurations are supported.

        Example: dns_nameservers 10.0.0.1 192.172.0.4
DOC_END

NAME: hosts_file
TYPE: string
DEFAULT: @DEFAULT_HOSTS@
LOC: Config.etcHostsPath
DOC_START
        Location of the host-local IP name-address associations
        database. Most Operating Systems have such a file on different
        default locations:
        - Un*X & Linux:    /etc/hosts
        - Windows NT/2000: %SystemRoot%\system32\drivers\etc\hosts
                           (%SystemRoot% value install default is c:\winnt)
        - Windows XP/2003: %SystemRoot%\system32\drivers\etc\hosts
                           (%SystemRoot% value install default is c:\windows)
        - Windows 9x/Me:   %windir%\hosts
                           (%windir% value is usually c:\windows)
        - Cygwin:          /etc/hosts

        The file contains newline-separated definitions, in the
        form ip_address_in_dotted_form name [name ...] names are
        whitespace-separated. Lines beginning with an hash (#)
        character are comments.

        The file is checked at startup and upon configuration.
        If set to 'none', it won't be checked.
        If append_domain is used, that domain will be added to
        domain-local (i.e. not containing any dot character) host
        definitions.
DOC_END

NAME: append_domain
TYPE: string
LOC:  Config.appendDomain
DEFAULT: none
DOC_START
        Appends local domain name to hostnames without any dots in
        them.  append_domain must begin with a period.

        Be warned there are now Internet names with no dots in
        them using only top-domain names, so setting this may
        cause some Internet sites to become unavailable.

Example:
 append_domain .yourdomain.com
DOC_END

NAME: ignore_unknown_nameservers
TYPE: onoff
LOC: Config.onoff.ignore_unknown_nameservers
DEFAULT: on
IFDEF: !USE_DNSHELPER
DOC_START
        By default Squid checks that DNS responses are received
        from the same IP addresses they are sent to.  If they
        don't match, Squid ignores the response and writes a warning
        message to cache.log.  You can allow responses from unknown
        nameservers by setting this option to 'off'.
DOC_END

NAME: dns_v4_first
TYPE: onoff
DEFAULT: off
LOC: Config.dns.v4_first
IFDEF: !USE_DNSHELPER
DOC_START
        With the IPv6 Internet being as fast or faster than IPv4 Internet
        for most networks Squid prefers to contact websites over IPv6.

        This option reverses the order of preference to make Squid contact
        dual-stack websites over IPv4 first. Squid will still perform both
        IPv6 and IPv4 DNS lookups before connecting.

        WARNING:
          This option will restrict the situations under which IPv6
          connectivity is used (and tested). Hiding network problems
          which would otherwise be detected and warned about.
DOC_END

NAME: ipcache_size
COMMENT: (number of entries)
TYPE: int
DEFAULT: 1024
LOC: Config.ipcache.size
DOC_NONE

NAME: ipcache_low
COMMENT: (percent)
TYPE: int
DEFAULT: 90
LOC: Config.ipcache.low
DOC_NONE

NAME: ipcache_high
COMMENT: (percent)
TYPE: int
DEFAULT: 95
LOC: Config.ipcache.high
DOC_START
        The size, low-, and high-water marks for the IP cache.
DOC_END

NAME: fqdncache_size
COMMENT: (number of entries)
TYPE: int
DEFAULT: 1024
LOC: Config.fqdncache.size
DOC_START
        Maximum number of FQDN cache entries.
DOC_END

COMMENT_START
 MISCELLANEOUS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: memory_pools
COMMENT: on|off
TYPE: onoff
DEFAULT: on
LOC: Config.onoff.mem_pools
DOC_START
        If set, Squid will keep pools of allocated (but unused) memory
        available for future use.  If memory is a premium on your
        system and you believe your malloc library outperforms Squid
        routines, disable this.
DOC_END

NAME: memory_pools_limit
COMMENT: (bytes)
TYPE: b_int64_t
DEFAULT: 5 MB
LOC: Config.MemPools.limit
DOC_START
        Used only with memory_pools on:
        memory_pools_limit 50 MB

        If set to a non-zero value, Squid will keep at most the specified
        limit of allocated (but unused) memory in memory pools. All free()
        requests that exceed this limit will be handled by your malloc
        library. Squid does not pre-allocate any memory, just safe-keeps
        objects that otherwise would be free()d. Thus, it is safe to set
        memory_pools_limit to a reasonably high value even if your
        configuration will use less memory.

        If set to none, Squid will keep all memory it can. That is, there
        will be no limit on the total amount of memory used for safe-keeping.

        To disable memory allocation optimization, do not set
        memory_pools_limit to 0 or none. Set memory_pools to "off" instead.

        An overhead for maintaining memory pools is not taken into account
        when the limit is checked. This overhead is close to four bytes per
        object kept. However, pools may actually _save_ memory because of
        reduced memory thrashing in your malloc library.
DOC_END

NAME: forwarded_for
COMMENT: on|off|transparent|truncate|delete
TYPE: string
DEFAULT: on
LOC: opt_forwarded_for
DOC_START
        If set to "on", Squid will append your client's IP address
        in the HTTP requests it forwards. By default it looks like:

                X-Forwarded-For: 192.1.2.3

        If set to "off", it will appear as

                X-Forwarded-For: unknown

        If set to "transparent", Squid will not alter the
        X-Forwarded-For header in any way.

        If set to "delete", Squid will delete the entire
        X-Forwarded-For header.

        If set to "truncate", Squid will remove all existing
        X-Forwarded-For entries, and place the client IP as the sole entry.
DOC_END

NAME: cachemgr_passwd
TYPE: cachemgrpasswd
DEFAULT: none
LOC: Config.passwd_list
DOC_START
        Specify passwords for cachemgr operations.

        Usage: cachemgr_passwd password action action ...

        Some valid actions are (see cache manager menu for a full list):
                5min
                60min
                asndb
                authenticator
                cbdata
                client_list
                comm_incoming
                config *
                counters
                delay
                digest_stats
                dns
                events
                filedescriptors
                fqdncache
                histograms
                http_headers
                info
                io
                ipcache
                mem
                menu
                netdb
                non_peers
                objects
                offline_toggle *
                pconn
                peer_select
                reconfigure *
                redirector
                refresh
                server_list
                shutdown *
                store_digest
                storedir
                utilization
                via_headers
                vm_objects

        * Indicates actions which will not be performed without a
          valid password, others can be performed if not listed here.

        To disable an action, set the password to "disable".
        To allow performing an action without a password, set the
        password to "none".

        Use the keyword "all" to set the same password for all actions.

Example:
 cachemgr_passwd secret shutdown
 cachemgr_passwd lesssssssecret info stats/objects
 cachemgr_passwd disable all
DOC_END

NAME: client_db
COMMENT: on|off
TYPE: onoff
DEFAULT: on
LOC: Config.onoff.client_db
DOC_START
        If you want to disable collecting per-client statistics,
        turn off client_db here.
DOC_END

NAME: refresh_all_ims
COMMENT: on|off
TYPE: onoff
DEFAULT: off
LOC: Config.onoff.refresh_all_ims
DOC_START
        When you enable this option, squid will always check
        the origin server for an update when a client sends an
        If-Modified-Since request.  Many browsers use IMS
        requests when the user requests a reload, and this
        ensures those clients receive the latest version.

        By default (off), squid may return a Not Modified response
        based on the age of the cached version.
DOC_END

NAME: reload_into_ims
IFDEF: USE_HTTP_VIOLATIONS
COMMENT: on|off
TYPE: onoff
DEFAULT: off
LOC: Config.onoff.reload_into_ims
DOC_START
        When you enable this option, client no-cache or ``reload''
        requests will be changed to If-Modified-Since requests.
        Doing this VIOLATES the HTTP standard.  Enabling this
        feature could make you liable for problems which it
        causes.

        see also refresh_pattern for a more selective approach.
DOC_END

NAME: connect_retries
TYPE: int
LOC: Config.connect_retries
DEFAULT: 0
DOC_START
        This sets the maximum number of connection attempts made for each
        TCP connection. The connect_retries attempts must all still
        complete within the connection timeout period.

        The default is not to re-try if the first connection attempt fails.
        The (not recommended) maximum is 10 tries.

        A warning message will be generated if it is set to a too-high
        value and the configured value will be over-ridden.

        Note: These re-tries are in addition to forward_max_tries
        which limit how many different addresses may be tried to find
        a useful server.
DOC_END

NAME: retry_on_error
TYPE: onoff
LOC: Config.retry.onerror
DEFAULT: off
DOC_START
        If set to ON Squid will automatically retry requests when
        receiving an error response with status 403 (Forbidden),
        500 (Internal Error), 501 or 503 (Service not available).
        Status 502 and 504 (Gateway errors) are always retried.
        
        This is mainly useful if you are in a complex cache hierarchy to
        work around access control errors.
        
        NOTE: This retry will attempt to find another working destination.
        Which is different from the server which just failed.
DOC_END

NAME: as_whois_server
TYPE: string
LOC: Config.as_whois_server
DEFAULT: whois.ra.net
DOC_START
        WHOIS server to query for AS numbers.  NOTE: AS numbers are
        queried only when Squid starts up, not for every request.
DOC_END

NAME: offline_mode
TYPE: onoff
LOC: Config.onoff.offline
DEFAULT: off
DOC_START
        Enable this option and Squid will never try to validate cached
        objects.
DOC_END

NAME: uri_whitespace
TYPE: uri_whitespace
LOC: Config.uri_whitespace
DEFAULT: strip
DOC_START
        What to do with requests that have whitespace characters in the
        URI.  Options:

        strip:  The whitespace characters are stripped out of the URL.
                This is the behavior recommended by RFC2396.
        deny:   The request is denied.  The user receives an "Invalid
                Request" message.
        allow:  The request is allowed and the URI is not changed.  The
                whitespace characters remain in the URI.  Note the
                whitespace is passed to redirector processes if they
                are in use.
        encode: The request is allowed and the whitespace characters are
                encoded according to RFC1738.  This could be considered
                a violation of the HTTP/1.1
                RFC because proxies are not allowed to rewrite URI's.
        chop:   The request is allowed and the URI is chopped at the
                first whitespace.  This might also be considered a
                violation.
DOC_END

NAME: chroot
TYPE: string
LOC: Config.chroot_dir
DEFAULT: none
DOC_START
        Specifies a directory where Squid should do a chroot() while
        initializing.  This also causes Squid to fully drop root
        privileges after initializing.  This means, for example, if you
        use a HTTP port less than 1024 and try to reconfigure, you may
        get an error saying that Squid can not open the port.
DOC_END

NAME: balance_on_multiple_ip
TYPE: onoff
LOC: Config.onoff.balance_on_multiple_ip
DEFAULT: off
DOC_START
        Modern IP resolvers in squid sort lookup results by preferred access.
        By default squid will use these IP in order and only rotates to
        the next listed when the most preffered fails.

        Some load balancing servers based on round robin DNS have been
        found not to preserve user session state across requests
        to different IP addresses.

        Enabling this directive Squid rotates IP's per request.
DOC_END

NAME: pipeline_prefetch
TYPE: onoff
LOC: Config.onoff.pipeline_prefetch
DEFAULT: off
DOC_START
        To boost the performance of pipelined requests to closer
        match that of a non-proxied environment Squid can try to fetch
        up to two requests in parallel from a pipeline.

        Defaults to off for bandwidth management and access logging
        reasons.

        WARNING: pipelining breaks NTLM and Negotiate/Kerberos authentication.
DOC_END

NAME: high_response_time_warning
TYPE: int
COMMENT: (msec)
LOC: Config.warnings.high_rptm
DEFAULT: 0
DOC_START
        If the one-minute median response time exceeds this value,
        Squid prints a WARNING with debug level 0 to get the
        administrators attention.  The value is in milliseconds.
DOC_END

NAME: high_page_fault_warning
TYPE: int
LOC: Config.warnings.high_pf
DEFAULT: 0
DOC_START
        If the one-minute average page fault rate exceeds this
        value, Squid prints a WARNING with debug level 0 to get
        the administrators attention.  The value is in page faults
        per second.
DOC_END

NAME: high_memory_warning
TYPE: b_size_t
LOC: Config.warnings.high_memory
DEFAULT: 0 KB
DOC_START
        If the memory usage (as determined by mallinfo) exceeds
        this amount, Squid prints a WARNING with debug level 0 to get
        the administrators attention.
DOC_END

NAME: sleep_after_fork
COMMENT: (microseconds)
TYPE: int
LOC: Config.sleep_after_fork
DEFAULT: 0
DOC_START
        When this is set to a non-zero value, the main Squid process
        sleeps the specified number of microseconds after a fork()
        system call. This sleep may help the situation where your
        system reports fork() failures due to lack of (virtual)
        memory. Note, however, if you have a lot of child
        processes, these sleep delays will add up and your
        Squid will not service requests for some amount of time
        until all the child processes have been started.
        On Windows value less then 1000 (1 milliseconds) are
        rounded to 1000.
DOC_END

NAME: windows_ipaddrchangemonitor
IFDEF: _SQUID_MSWIN_
COMMENT: on|off
TYPE: onoff
DEFAULT: on
LOC: Config.onoff.WIN32_IpAddrChangeMonitor
DOC_START
        On Windows Squid by default will monitor IP address changes and will 
        reconfigure itself after any detected event. This is very useful for
        proxies connected to internet with dial-up interfaces.
        In some cases (a Proxy server acting as VPN gateway is one) it could be
        desiderable to disable this behaviour setting this to 'off'.
        Note: after changing this, Squid service must be restarted.
DOC_END

NAME: eui_lookup
TYPE: onoff
IFDEF: USE_SQUID_EUI
DEFAULT: on
LOC: Eui::TheConfig.euiLookup
DOC_START
        Whether to lookup the EUI or MAC address of a connected client.
DOC_END

NAME: max_filedescriptors max_filedesc
TYPE: int
DEFAULT: 0
LOC: Config.max_filedescriptors
DOC_START
        The maximum number of filedescriptors supported.

        The default "0" means Squid inherits the current ulimit setting.

        Note: Changing this requires a restart of Squid. Also
        not all comm loops supports large values.
DOC_END

NAME: workers
TYPE: int
LOC: Config.workers
DEFAULT: 1
DOC_START
        Number of main Squid processes or "workers" to fork and maintain.
        0: "no daemon" mode, like running "squid -N ..."
        1: "no SMP" mode, start one main Squid process daemon (default)
        N: start N main Squid process daemons (i.e., SMP mode)

        In SMP mode, each worker does nearly all what a single Squid daemon
        does (e.g., listen on http_port and forward HTTP requests).
DOC_END

NAME: cpu_affinity_map
TYPE: CpuAffinityMap
LOC: Config.cpuAffinityMap
DEFAULT: none
DOC_START
        Usage: cpu_affinity_map process_numbers=P1,P2,... cores=C1,C2,...

        Sets 1:1 mapping between Squid processes and CPU cores. For example,

            cpu_affinity_map process_numbers=1,2,3,4 cores=1,3,5,7

        affects processes 1 through 4 only and places them on the first
        four even cores, starting with core #1.

        CPU cores are numbered starting from 1. Requires support for
        sched_getaffinity(2) and sched_setaffinity(2) system calls.

        Multiple cpu_affinity_map options are merged.

        See also: workers
DOC_END

EOF