Author: adrian

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

#
# $Id: cf.data.pre,v 1.451 2007/08/17 03:33:23 hno Exp $
#
# 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
#  development; see the SPONSORS file for full details.  Squid is
#  Copyrighted (C) 2000 by the Regents of the University of
#  California; see the COPYRIGHT file for full details.  Squid
#  incorporates software developed and/or copyrighted by other
#  sources; see the CREDITS file for full details.
#
#  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 @VERSION@
        ----------------------------

        This is the default Squid configuration file. You may wish
        to look at the Squid home page (http://www.squid-cache.org/)
        for the FAQ and other documentation.

        The default Squid config file shows what the defaults for
        various options happen to be.  If you don't need to change the
        default, you shouldn't uncomment the line.  Doing so may cause
        run-time problems.  In some cases "none" refers to no default
        setting at all, while in other cases it refers to a valid
        option - the comments for that keyword indicate if this is the
        case.

COMMENT_END

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

NAME: http_port ascii_port
TYPE: http_port_list
DEFAULT: none
LOC: Config.Sockaddr.http
DOC_START
        Usage:  port [options]
                hostname:port [options]
                1.2.3.4:port [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.  This replaces the old 'tcp_incoming_address'
        option.  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.

        Options:

           transparent  Support for transparent interception of
                        outgoing requests without browser settings.

           accel        Accelerator mode. Also needs at least one of
                        vhost / vport / defaultsite.

           vhost        Accelerator mode using Host header for virtual
                        domain support. Implies accel.

           vport        Accelerator with IP based virtual host support.
                        Implies accel.

           vport=NN     As above, but uses specified port number rather
                        than the http_port number. Implies accel.

           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.
                        Implies accel.

           protocol=    Protocol to reconstruct accelerated requests with.
                        Defaults to http.

           tproxy       Support Linux TPROXY for spoofing outgoing
                        connections using the client IP address.

           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'.

        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: https_port_list
DEFAULT: none
LOC: Config.Sockaddr.https
DOC_START
        Usage:  [ip:]port cert=certificate.pem [key=key.pem] [options...]

        The socket address where Squid will listen for HTTPS client
        requests.

        This is really only 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.

        Options:

           accel        Accelerator mode. Also needs at least one of
                        defaultsite or vhost.

           defaultsite= The name of the https site presented on
                        this port. Implies accel.

           vhost        Accelerator mode using Host header for virtual
                        domain support. Requires a wildcard certificate
                        or other certificate valid for more than one domain.
                        Implies accel.

           protocol=    Protocol to reconstruct accelerated requests with.
                        Defaults to https.

           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.

           vport        Accelerator with IP based virtual host support.

           vport=NN     As above, but uses specified port number rather
                        than the https_port number. Implies accel.

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
DOC_END

NAME: sslproxy_options
IFDEF: USE_SSL
DEFAULT: none
LOC: Config.ssl_client.options
TYPE: string
DOC_START
        SSL engine options to use when proxying https:// URLs
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
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: 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 even if they fail to
                                verify.
            NO_DEFAULT_CA       Don't use the default CA list built in
                                to OpenSSL.
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.
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  proxy-only default
        cache_peer sib1.foo.net         sibling   3128  3130  proxy-only
        cache_peer sib2.foo.net         sibling   3128  3130  proxy-only

              type:  either 'parent', 'sibling', or 'multicast'.

        proxy-port:  The port number where the cache listens for proxy
                     requests.

          icp-port:  Used for querying neighbor caches about
                     objects.  To have a non-ICP neighbor
                     specify '7' for the ICP port and make sure the
                     neighbor machine has the UDP echo port
                     enabled in its /etc/inetd.conf file.
                NOTE: Also requires icp_port option enabled to send/receive
                      requests via this method.

            options: proxy-only
                     weight=n
                     basetime=n
                     ttl=n
                     no-query
                     background-ping
                     default
                     round-robin
                     weighted-round-robin
                     carp
                     multicast-responder
                     closest-only
                     no-digest
                     no-netdb-exchange
                     no-delay
                     login=user:password | PASS | *:password
                     connect-timeout=nn
                     digest-url=url
                     allow-miss
                     max-conn=n
                     htcp
                     htcp-oldsquid
                     originserver
                     name=xxx
                     forceddomain=name
                     ssl
                     sslcert=/path/to/ssl/certificate
                     sslkey=/path/to/ssl/key
                     sslversion=1|2|3|4
                     sslcipher=...
                     ssloptions=...
                     front-end-https[=on|auto]

                     use 'proxy-only' to specify objects fetched
                     from this cache should not be saved locally.

                     use 'weight=n' 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.

                     use 'basetime=n' to 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.

                     use 'ttl=n' to specify a IP multicast TTL to use
                     when sending an 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 below.

                     use 'no-query' to NOT send ICP queries to this
                     neighbor.

                     use '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.

                     use 'default' if 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 mechanisms.
                     If specified more than once, only the first is used.

                     use 'round-robin' to define a set of parents which
                     should be used in a round-robin fashion in the
                     absence of any ICP queries.

                     use 'weighted-round-robin' to define a set of 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.

                     use 'carp' to define a set of 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 weigth.

                     '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.

                     use 'no-digest' to NOT request cache digests from
                     this neighbor.

                     'no-netdb-exchange' disables requesting ICMP
                     RTT database (NetDB) from the neighbor.

                     use 'no-delay' to prevent access to this neighbor
                     from influencing the delay pools.

                     use '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 %%.

                     use 'login=PASS' if users must authenticate against
                     the upstream proxy or in the case of a reverse proxy
                     configuration, the origin web server.  This will pass
                     the users credentials as they are to the peer.
                     This only works for the Basic HTTP authentication scheme.
                     Note: To combine this with proxy_auth both proxies must
                     share the same user database as HTTP only allows for
                     one proxy login.
                     Also be warned this will expose your users proxy
                     password to the peer. USE WITH CAUTION

                     use 'login=*:password' to pass 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.

                     use 'connect-timeout=nn' to specify a peer
                     specific connect timeout (also see the
                     peer_connect_timeout directive)

                     use 'digest-url=url' to tell Squid to fetch the cache
                     digest (if digests are enabled) for this host from
                     the specified URL rather than the Squid default
                     location.

                     use 'allow-miss' to 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)

                     use 'max-conn=n' to limit the amount of connections Squid
                     may open to this peer.

                     use 'htcp' to send HTCP, instead of ICP, queries
                     to the neighbor.  You probably also want to
                     set the "icp port" to 4827 instead of 3130.

                     use 'htcp-oldsquid' to send HTCP to old Squid versions

                     'originserver' causes this parent peer to be contacted as
                     a origin server. Meant to be used in accelerator setups.

                     use 'name=xxx' if you have multiple peers on the same
                     host but different ports. This name can be used to
                     differentiate the peers in cache_peer_access and similar
                     directives.

                     use 'forceddomain=name' to forcibly set the Host header
                     of requests forwarded to this peer. Useful in accelerator
                     setups where the server (peer) expects a certain domain
                     name and using redirectors to feed this domainname
                     is not feasible.

                     use 'ssl' to indicate connections to this peer should
                     bs SSL/TLS encrypted.

                     use 'sslcert=/path/to/ssl/certificate' to specify a client
                     SSL certificate to use when connecting to this peer.

                     use 'sslkey=/path/to/ssl/key' to specify 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.

                     use sslversion=1|2|3|4 to specify the SSL version to use
                     when connecting to this peer
                        1 = automatic (default)
                        2 = SSL v2 only
                        3 = SSL v3 only
                        4 = TLS v1 only

                     use sslcipher=... to specify the list of valid SSL ciphers
                     to use when connecting to this peer.

                     use ssloptions=... to specify various SSL engine options:
                        NO_SSLv2  Disallow the use of SSLv2
                        NO_SSLv3  Disallow the use of SSLv3
                        NO_TLSv1  Disallow the use of TLSv1
                     See src/ssl_support.c or the OpenSSL documentation for
                     a more complete list.

                     use sslcafile=... to specify a file containing additional
                     CA certificates to use when verifying the peer certificate

                     use sslcapath=... to specify a directory containing additional
                     CA certificates to use when verifying the peer certificate

                     use sslcrlfile=... to specify a certificate revocation
                     list file to use when verifying the peer certificate.
                     
                     use sslflags=... to 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

                     use ssldomain= to specify 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.

                     use front-end-https to enable the "Front-End-Https: On"
                     header needed when using Squid as a SSL frontend infront
                     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.
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: 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 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  parent cache.foo.org 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: 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.
        Note: never_direct overrides this option.
NOCOMMENT_START
#We recommend you to use at least the following line.
hierarchy_stoplist cgi-bin ?
NOCOMMENT_END
DOC_END

NAME: cache no_cache
TYPE: acl_access
DEFAULT: none
LOC: Config.accessList.noCache
DOC_START
        A list of ACL elements which, if matched, 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 word 'DENY' to indicate the ACL names which should
        NOT be cached.

        Default is to allow all to be cached
NOCOMMENT_START
#We recommend you to use the following two lines.
acl QUERY urlpath_regex cgi-bin \?
cache deny QUERY
NOCOMMENT_END
DOC_END

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

NAME: cache_mem
COMMENT: (bytes)
TYPE: b_size_t
DEFAULT: 8 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.
DOC_END

NAME: maximum_object_size_in_memory
COMMENT: (bytes)
TYPE: b_size_t
DEFAULT: 8 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: 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

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_dir
TYPE: cachedir
DEFAULT: none
DEFAULT_IF_NONE: ufs @DEFAULT_SWAP_DIR@ 100 16 256
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.

        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.

        'Level-1' is the number of first-level subdirectories which
        will be created under the 'Directory'.  The default is 16.

        'Level-2' 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 coss store type:

        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.

        The null store type:

        no options are allowed or required

        Common options:

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

        max-size=n, refers to the max object size this storedir supports.
        It is used to initially choose the storedir to dump 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.
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: 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: 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: Config.Log.logformats
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   field width. If starting with 0 the
                        output is zero padded
                {arg}   argument such as header name etc

        Format codes:

                >a      Client source IP address
                >A      Client FQDN
                >p      Client source port
                <A      Server IP address or peer name
                la      Local IP address (http_port)
                lp      Local port number (http_port)
                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)
                >h      Request header. Optional header name argument
                        on the format header[:[separator]element]
                <h      Reply header. Optional header name argument
                        as for >h
                un      User name
                ul      User name from authentication
                ui      User name from ident
                us      User name from SSL
                ue      User name from external acl helper
                Hs      HTTP status code
                Ss      Squid request status (TCP_MISS etc)
                Sh      Squid hierarchy status (DEFAULT_PARENT etc)
                mt      MIME content type
                rm      Request method (GET/POST etc)
                ru      Request URL
                rp      Request URL-Path excluding hostname
                rv      Request protocol version
                et      Tag returned by external acl
                ea      Log string returned by external acl
                <st     Reply size including HTTP headers
                <sH     Reply high offset sent
                <sS     Upstream object size
                %       a literal % character

logformat squid  %ts.%03tu %6tr %>a %Ss/%03Hs %<st %rm %ru %un %Sh/%<A %mt
logformat squidmime  %ts.%03tu %6tr %>a %Ss/%03Hs %<st %rm %ru %un %Sh/%<A %mt [%>h] [%<h]
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
DOC_END

NAME: access_log cache_access_log
TYPE: access_log
LOC: Config.Log.accesslogs
DEFAULT: none
DOC_START
        These files log client request activities. Has a line every HTTP or
        ICP request. The format is:
        access_log <filepath> [<logformat name> [acl acl ...]]
        access_log none [acl acl ...]]

        Will log to the specified file 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 file.

        To disable logging of a request use the filepath "none", in which case
        a logformat name should not be specified.

        To log the request via syslog specify a filepath of "syslog":

        access_log syslog[:facility|priority] [format [acl1 [acl2 ....]]]
        where facility could be any of:
        LOG_AUTHPRIV, LOG_DAEMON, LOG_LOCAL0 .. LOG_LOCAL7 or LOG_USER.

        And priority could be any of:
        LOG_ERR, LOG_WARNING, LOG_NOTICE, LOG_INFO, LOG_DEBUG.
NOCOMMENT_START
access_log @DEFAULT_ACCESS_LOG@ squid
NOCOMMENT_END
DOC_END

NAME: cache_log
TYPE: string
DEFAULT: @DEFAULT_CACHE_LOG@
LOC: Config.Log.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 with the "debug_options" tag below.
DOC_END

NAME: cache_store_log
TYPE: string
DEFAULT: @DEFAULT_STORE_LOG@
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". There are
        not really utilities to analyze this data, so you can safely
        disable it.
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>'.
DOC_END

NAME: emulate_httpd_log
COMMENT: on|off
TYPE: onoff
DEFAULT: off
LOC: Config.onoff.common_log
DOC_START
        The Cache can emulate the log file format which many 'httpd'
        programs use.  To disable/enable this emulation, set
        emulate_httpd_log to 'off' or 'on'.  The default
        is to use the native log format since it includes useful
        information Squid-specific log analyzers use.
DOC_END

NAME: log_ip_on_direct
COMMENT: on|off
TYPE: onoff
DEFAULT: on
LOC: Config.onoff.log_ip_on_direct
DOC_START
        Log the destination IP address in the hierarchy log tag when going
        direct. Earlier Squid versions logged the hostname here. If you
        prefer the old way set this to off.
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: string
LOC: Config.Log.useragent
DEFAULT: none
IFDEF: USE_USERAGENT_LOG
DOC_START
        Squid will write the User-Agent field from HTTP requests
        to the filename specified here.  By default useragent_log
        is disabled.
DOC_END

NAME: referer_log referrer_log
TYPE: string
LOC: Config.Log.referer
DEFAULT: none
IFDEF: USE_REFERER_LOG
DOC_START
        Squid will write the Referer field from HTTP requests to the
        filename specified here.  By default referer_log is disabled.
        Note that "referer" is actually a misspelling of "referrer"
        however the misspelt version has been accepted into the HTTP RFCs
        and we accept both.
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: debug_options
TYPE: debug
DEFAULT: ALL,1
LOC: Config.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".
DOC_END

NAME: log_fqdn
COMMENT: on|off
TYPE: onoff
DEFAULT: off
LOC: Config.onoff.log_fqdn
DOC_START
        Turn this on if you wish to log fully qualified domain names
        in the access.log. To do this Squid does a DNS lookup of all
        IP's connecting to it. This can (in some situations) increase
        latency, which makes your cache seem slower for interactive
        browsing.
DOC_END

NAME: client_netmask
TYPE: address
LOC: Config.Addrs.client_netmask
DEFAULT: 255.255.255.255
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
IFDEF: WIP_FWD_LOG
TYPE: string
DEFAULT: none
LOC: Config.Log.forward
DOC_START
        Logs the server-side requests.

        This is currently work in progress.
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

COMMENT_START
 OPTIONS FOR EXTERNAL SUPPORT PROGRAMS
 -----------------------------------------------------------------------------
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_list_width
TYPE: size_t
DEFAULT: 32
LOC: Config.Ftp.list_width
DOC_START
        Sets the width of ftp listings. This should be set to fit in
        the width of a standard browser. Setting this too small
        can cut off long filenames when browsing ftp sites.
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.
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

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.Program.pinger
IFDEF: USE_ICMP
DOC_START
        Specify the location of the executable for the pinger process.
DOC_END

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

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

        URL <SP> client_ip "/" fqdn <SP> user <SP> method <NL>

        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).

        By default, a URL rewriter is not used.
DOC_END

NAME: url_rewrite_children redirect_children
TYPE: int
DEFAULT: 5
LOC: Config.redirectChildren
DOC_START
        The number of redirector processes to spawn. If you start
        too few Squid will have to wait for them to process a backlog of
        URLs, slowing it down. If you start too many they will use RAM
        and other system resources.
DOC_END

NAME: url_rewrite_concurrency redirect_concurrency
TYPE: int
DEFAULT: 0
LOC: Config.redirectConcurrency
DOC_START
        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.
DOC_END

NAME: url_rewrite_host_header redirect_rewrites_host_header
TYPE: onoff
DEFAULT: on
LOC: Config.onoff.redir_rewrites_host
DOC_START
        By default Squid rewrites any Host: header in redirected
        requests.  If you are running an accelerator this may
        not be a wanted effect of a redirector.

        WARNING: Entries are cached on the result of the URL rewriting
        process, so be careful if you have domain-virtual hosts.
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.
DOC_END

NAME: auth_param
TYPE: authparam
LOC: Config.authConfiguration
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.

        === 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

        "children" numberofchildren
        The 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.
        auth_param basic children 5

        "concurrency" concurrency
        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 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 concurrency 0

        "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_auth_pw @DEFAULT_PREFIX@/etc/digpass

        "children" numberofchildren
        The number of authenticator processes to spawn (no default).
        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.
        auth_param digest children 5

        "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
        The number of authenticator processes to spawn (no default).
        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.

        auth_param ntlm children 5

        "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
        The number of authenticator processes to spawn (no default).
        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.
        auth_param negotiate children 5

        "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

NOCOMMENT_START
#Recommended minimum configuration per scheme:
#auth_param negotiate program <uncomment and complete this line to activate>
#auth_param negotiate children 5
#auth_param negotiate keep_alive on
#auth_param ntlm program <uncomment and complete this line to activate>
#auth_param ntlm children 5
#auth_param ntlm keep_alive on
#auth_param digest program <uncomment and complete this line>
#auth_param digest children 5
#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
#auth_param basic realm Squid proxy-caching web server
#auth_param basic credentialsttl 2 hours
NOCOMMENT_END
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

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=n    Number of acl helper processes spawn to service
                        external acl lookups of this type. (default 5)
          concurrency=n concurrency level per process. Only used with helpers
                        capable of processing more than one query at a time.
          cache=n       result cache size, 0 is unbounded (default)
          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 0 for no grace period)
          protocol=2.5  Compatibility mode for Squid-2.5 external acl helpers

        FORMAT specifications

          %LOGIN        Authenticated user login name
          %EXT_USER     Username from 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
          %{Hdr:member} HTTP request header list member
          %{Hdr:;member}
                        HTTP request header list member using ; as
                        list separator. ; can be any non-alphanumeric
                        character.

        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

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

NAME: request_header_max_size
COMMENT: (KB)
TYPE: b_size_t
DEFAULT: 20 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: 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: 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-private
                 ignore-auth
                 refresh-ims

                override-expire enforces min age even if the server
                sent a Expires: header. Doing this VIOLATES the HTTP
                standard.  Enabling this feature could make you liable
                for problems which it causes.

                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-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.

        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.

Suggested default:
NOCOMMENT_START
refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
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
COMMENT: time-units
TYPE: time_t
LOC: Config.negativeTtl
DEFAULT: 5 minutes
DOC_START
        Time-to-Live (TTL) for failed requests.  Certain types of
        failures (such as "connection refused" and "404 Not Found") are
        negatively-cached for a configurable amount of time.  The
        default is 5 minutes.  Note that this is different from
        negative caching of DNS lookups.
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: (bytes)
TYPE: b_int64_t
LOC: Config.rangeOffsetLimit
DEFAULT: 0 KB
DOC_START
        Sets a upper limit on how far into the 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.

        A value of -1 causes Squid to always fetch the object from the
        beginning so it may cache the result. (2.0 style)

        A value of 0 causes Squid to never fetch more than the
        client requested. (default)
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 enorinments 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: (kbytes)
TYPE: kb_size_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: broken_posts
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.

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

NAME: via
IFDEF: 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: This may eventually cause some varying
        objects not intended for caching to get cached.
DOC_END

NAME: extension_methods
TYPE: wordlist
LOC: Config.ext_methods
DEFAULT: none
DOC_START
        Squid only knows about standardized HTTP request methods.
        You can add up to 20 additional "extension" methods here.
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: 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. This new method creates a list of ACLs
        for each header, allowing you very fine-tuned header
        mangling.

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

        You can only specify known headers for the header name.
        Other headers are reclassified as 'Other'. You can also
        refer to all the headers with 'All'.

        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 Proxy-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: 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.

        This option replaces the old 'anonymize_headers' and the
        older 'http_anonymizer' option with something that is much
        more configurable. This new method creates a list of ACLs
        for each header, allowing you very fine-tuned header
        mangling.

        You can only specify known headers for the header name.
        Other headers are reclassified as 'Other'. You can also
        refer to all the headers with 'All'.

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

        This option allows you to change the contents of headers
        denied with 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: 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: request_timeout
TYPE: time_t
LOC: Config.Timeout.request
DEFAULT: 5 minutes
DOC_START
        How long to wait for an HTTP request after initial
        connection establishment.
DOC_END

NAME: persistent_request_timeout
TYPE: time_t
LOC: Config.Timeout.persistent_request
DEFAULT: 1 minute
DOC_START
        How long to wait for the next HTTP request on a persistent
        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: on
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, half-closed client
        connections are kept open until a read(2) or write(2) on the
        socket returns an error.  Change this option to 'off' and Squid
        will immediately close client connections when read(2) returns
        "no more data to read."
DOC_END

NAME: pconn_timeout
TYPE: time_t
LOC: Config.Timeout.pconn
DEFAULT: 120 seconds
DOC_START
        Timeout for idle persistent connections to servers and other
        proxies.
DOC_END

NAME: ident_timeout
TYPE: time_t
IFDEF: USE_IDENT
LOC: Config.Timeout.ident
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
 ACCESS CONTROLS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: acl
TYPE: acl
LOC: Config.aclList
DEFAULT: none
DOC_START
        Defining an Access List

        acl aclname acltype string1 ...
        acl aclname acltype "file" ...

        when using "file", the file should contain one item per line

        acltype is one of the types described below

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

        acl aclname src      ip-address/netmask ... (clients IP address)
        acl aclname src      addr1-addr2/netmask ... (range of addresses)
        acl aclname dst      ip-address/netmask ... (URL host's IP address)
        acl aclname myip     ip-address/netmask ... (local socket IP address)

        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.
          #
          # 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, client IP
        acl aclname dstdomain   .foo.com ...    # Destination server from URL
        acl aclname srcdom_regex [-i] xxx ...   # regex matching client name
        acl aclname dstdom_regex [-i] xxx ...   # regex matching server
          # 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 http_status 200 301 500- 400-403 ...     # status code in reply

        acl aclname time     [day-abbrevs]  [h1:m1-h2:m2]
            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
        acl aclname urlpath_regex [-i] \.gif$ ...       # regex matching on URL path
        acl aclname port     80 70 21 ...
        acl aclname port     0-1024 ...         # ranges allowed
        acl aclname myport   3128 ...           # (local socket TCP port)
        acl aclname proto    HTTP FTP ...
        acl aclname method   GET POST ...
        acl aclname browser  [-i] regexp ...
          # pattern match on User-Agent header (see also req_header below)
        acl aclname referer_regex  [-i] regexp ...
          # pattern match on Referer header
          # Referer is highly unreliable, so use with care
        acl aclname ident    username ...
        acl aclname ident_regex [-i] pattern ...
          # string match on ident output.
          # use REQUIRED to accept any non-null ident.
        acl aclname src_as   number ...
        acl aclname dst_as   number ...
          # 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 proxy_auth [-i] username ...
        acl aclname proxy_auth_regex [-i] pattern ...
          # list of valid usernames
          # use REQUIRED to accept any valid username.
          #
          # 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 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
          # Example:
          #
          #     acl snmppublic snmp_community public

        acl aclname maxconn number
          # This will be matched when the client's IP address has
          # more than <number> HTTP connections established.

        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.
          # 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 rep_mime_type mime-type1 ...
          # 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.
          # 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.

        acl aclname req_mime_type mime-type1 ...
          # 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.
          # 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"
          # ACLs.

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

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

        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

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

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:
acl all src 0.0.0.0/0.0.0.0
acl manager proto cache_object
acl localhost src 127.0.0.1/255.255.255.255
acl to_localhost dst 127.0.0.0/8
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: http_access
TYPE: acl_access
LOC: Config.accessList.http
DEFAULT: none
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" or "allow all" entry at the end
        of your access lists to avoid potential confusion.

NOCOMMENT_START
#Recommended minimum configuration:
#
# Only allow cachemgr access from localhost
http_access allow manager localhost
http_access deny manager
# Deny requests to unknown ports
http_access deny !Safe_ports
# Deny CONNECT to other than 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
# to list your (internal) IP networks from where browsing should
# be allowed
#acl our_networks src 192.168.1.0/24 192.168.2.0/24
#http_access allow our_networks

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

NAME: http_reply_access
TYPE: acl_access
LOC: Config.accessList.reply
DEFAULT: none
DEFAULT_IF_NONE: allow all
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.
DOC_END

NAME: icp_access
TYPE: acl_access
LOC: Config.accessList.icp
DEFAULT: none
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

NOCOMMENT_START
#Allow ICP queries from everyone
icp_access allow all
NOCOMMENT_END
DOC_END

NAME: htcp_access
IFDEF: USE_HTCP
TYPE: acl_access
LOC: Config.accessList.htcp
DEFAULT: none
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

#Allow HTCP queries from everyone
htcp_access allow all
DOC_END

NAME: htcp_clr_access
IFDEF: USE_HTCP
TYPE: acl_access
LOC: Config.accessList.htcp_clr
DEFAULT: none
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

#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
        Use to force your neighbors to use you as a sibling instead of
        a parent.  For example:

                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
        MISSES and all other clients can only fetch HITS.

        By default, allow all clients who passed the http_access rules
        to fetch MISSES from us.

NOCOMMENT_START
#Default setting:
# miss_access allow all
NOCOMMENT_END
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://www.squid-cache.org/FAQ/FAQ-10.html).
DOC_END

NAME: ident_lookup_access
TYPE: acl_access
IFDEF: USE_IDENT
DEFAULT: none
DEFAULT_IF_NONE: deny all
LOC: Config.accessList.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 198.168.1.0/255.255.255.0
        ident_lookup_access allow ident_aware_hosts
        ident_lookup_access deny all

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

NAME: tcp_outgoing_tos tcp_outgoing_ds tcp_outgoing_dscp
TYPE: acl_tos
DEFAULT: none
LOC: Config.accessList.outgoing_tos
DOC_START
        Allows you to select a TOS/Diffserv value to mark outgoing
        connections with, based on the username or source address
        making the request.

        tcp_outgoing_tos ds-field [!]aclname ...

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

        acl normal_service_net src 10.0.0.0/255.255.255.0
        acl good_service_net src 10.0.1.0/255.255.255.0
        tcp_outgoing_tos 0x00 normal_service_net 0x00
        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 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 values 0 - 63 is usable as the two highest bits
        have been redefined for use by ECN (RFC3168).

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

        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_persisten_connections
        to off when using this directive in such configurations.
DOC_END

NAME: clientside_tos
TYPE: acl_tos
DEFAULT: none
LOC: Config.accessList.clientside_tos
DOC_START
        Allows you to select a TOS/Diffserv value to mark client-side
        connections with, based on the username or source address
        making the request.
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] ...

        Example where requests from 10.0.0.0/24 will be forwarded
        with source address 10.1.0.1, 10.0.2.0/24 forwarded with
        source address 10.1.0.2 and the rest will be forwarded with
        source address 10.1.0.3.

        acl normal_service_net src 10.0.0.0/255.255.255.0
        acl good_service_net src 10.0.1.0/255.255.255.0
        tcp_outgoing_address 10.0.0.1 normal_service_net
        tcp_outgoing_address 10.0.0.2 good_service_net
        tcp_outgoing_address 10.0.0.3

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

        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.
DOC_END

NAME: reply_header_max_size
COMMENT: (KB)
TYPE: b_size_t
DEFAULT: 20 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: 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.
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.
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 complain
        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: nobody
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 to nobody.  If you define cache_effective_user, but not
        cache_effective_group, Squid sets the GID to the effective
        user's default group ID (taken from the password file) and
        supplementary group list from the from groups membership of
        cache_effective_user.
DOC_END

NAME: cache_effective_group
TYPE: string
DEFAULT: none
LOC: Config.effectiveGroup
DOC_START
        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 is 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.
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

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 uncomment the line
        below.

NOCOMMENT_START
#To enable announcing your cache, just uncomment the line below.
#announce_period 1 day
NOCOMMENT_END
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: ushort
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
IFDEF: ESI
TYPE:  string
LOC: Config.Accel.surrogate_id
DEFAULT: unset-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.
DOC_END

NAME: http_accel_surrogate_remote
IFDEF: ESI
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: 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: 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: 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 IP 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 IP 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).

        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"
DOC_END

NAME: delay_access
TYPE: delay_pool_access
DEFAULT: none
IFDEF: 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: 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_parameters pool aggregate

        For a class 2 delay pool:

delay_parameters pool aggregate individual

        For a class 3 delay pool:

delay_parameters pool aggregate network individual

        For a class 4 delay pool:

delay_parameters pool aggregate network individual user

        For a class 5 delay pool:

delay_parameters pool tag

        The variables here 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 "delay parameters" for the aggregate bucket
                                (class 1, 2, 3).

                individual      the "delay parameters" for the individual
                                buckets (class 2, 3).

                network         the "delay parameters" for the network buckets
                                (class 3).

                user            the delay parameters for the user buckets
                                (class 4).

                tag             the delay 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.

        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 64kbps
        (plus overheads), with no overall limit, the line is:

delay_parameters 1 -1/-1 8000/8000

        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 256kbps (strict limit)
        with each 8-bit network permitted 64kbps (strict limit) and each
        individual host permitted 4800bps with a bucket maximum size of 64kb
        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

        There must be one delay_parameters line for each delay pool.

        Finally, for a class 4 delay pool as in the example - each user will
        be limited to 128Kb 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: ushort
DEFAULT: 50
IFDEF: 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
 WCCPv1 AND WCCPv2 CONFIGURATION OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: wccp_router
TYPE: address
LOC: Config.Wccp.router
DEFAULT: 0.0.0.0
IFDEF: USE_WCCP
DOC_NONE
NAME: wccp2_router
TYPE: sockaddr_in_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: int
LOC: Config.Wccp2.forwarding_method
DEFAULT: 1
IFDEF: USE_WCCPv2
DOC_START
        WCCP2 allows the setting of forwarding methods between the
        router/switch and the cache.  Valid values are as follows:

        1 - GRE encapsulation (forward the packet in a GRE/WCCP tunnel)
        2 - 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: int
LOC: Config.Wccp2.return_method
DEFAULT: 1
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:

        1 - GRE encapsulation (forward the packet in a GRE/WCCP tunnel)
        2 - 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: int
LOC: Config.Wccp2.assignment_method
DEFAULT: 1
IFDEF: USE_WCCPv2
DOC_START
        WCCP2 allows the setting of methods to assign the WCCP hash
        Valid values are as follows:

        1 - Hash assignment
        2 - 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: none
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, dest_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: off
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 USE_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 number of seconds 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 number of seconds 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: ushort
LOC: Config.Port.snmp
DEFAULT: 3401
IFDEF: SQUID_SNMP
DOC_START
        Squid can now serve statistics and status information via SNMP.
        By default it listens to port 3401 on the machine. If you don't
        wish to use SNMP, set this to "0".
DOC_END

NAME: snmp_access
TYPE: acl_access
LOC: Config.accessList.snmp
DEFAULT: none
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 ...

Example:
 snmp_access allow snmppublic localhost
 snmp_access deny all
DOC_END

NAME: snmp_incoming_address
TYPE: address
LOC: Config.Addrs.snmp_incoming
DEFAULT: 0.0.0.0
IFDEF: SQUID_SNMP
DOC_NONE
NAME: snmp_outgoing_address
TYPE: address
LOC: Config.Addrs.snmp_outgoing
DEFAULT: 255.255.255.255
IFDEF: SQUID_SNMP
DOC_START
        Just like 'udp_incoming_address' above, 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 (0.0.0.0) is to listen on all
        available network interfaces.

        If snmp_outgoing_address is set to 255.255.255.255 (the default)
        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: ushort
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).
NOCOMMENT_START
icp_port @DEFAULT_ICP_PORT@
NOCOMMENT_END
DOC_END

NAME: htcp_port
IFDEF: USE_HTCP
TYPE: ushort
DEFAULT: 4827
LOC: Config.Port.htcp
DOC_START
        The port number where Squid sends and receives HTCP queries to
        and from neighbor caches.  Default is 4827.  To disable use
        "0".
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: 0.0.0.0
DOC_NONE

NAME: udp_outgoing_address
TYPE: address
LOC: Config.Addrs.udp_outgoing
DEFAULT: 255.255.255.255
DOC_START
        udp_incoming_address    is used for the ICP socket receiving packets
                                from other caches.
        udp_outgoing_address    is used for ICP packets sent out to other
                                caches.

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

        A udp_incoming_address value of 0.0.0.0 indicates Squid
        should listen for UDP messages on all available interfaces.

        If udp_outgoing_address is set to 255.255.255.255 (the default)
        it will use the same socket as udp_incoming_address. Only
        change this if you want to have ICP queries sent using another
        address than where this Squid listens for ICP queries from other
        caches.

        NOTE, udp_incoming_address and udp_outgoing_address can not
        have the same value since they both use port 3130.
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

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

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: 255.255.255.255
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: ushort
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: ushort
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: @DEFAULT_ERROR_DIR@
DOC_START
        If you wish to create your own versions of the default
        (English) error files, either to customize them to suit your
        language or company copy the template English files to another
        directory and point this tag at them.

        The squid developers are interested in making squid available in
        a wide variety of languages. If you are making translations for a
        langauge that Squid does not currently provide please consider
        contributing your translation back to the project.
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
        Example: deny_info ERR_CUSTOM_ACCESS_DENIED bad_guys

        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.

        You may use ERR_ pages that come with Squid or create your own pages
        and put them into the configured errors/ directory.

        Alternatively you can specify an error URL. The browsers will
        get redirected (302) to the specified URL. %s in the redirection
        URL will be replaced by the requested URL.

        Alternatively you can tell Squid to reset the TCP connection
        by specifying TCP_RESET.
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 no_cache.

        This option replaces some v1.1 options such as local_domain
        and local_ip.
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
                acl all src 0.0.0.0/0.0.0.0
                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 option replaces some v1.1 options such as inside_firewall
        and firewall_ip.
DOC_END

COMMENT_START
 ADVANCED NETWORKING OPTIONS
 -----------------------------------------------------------------------------
COMMENT_END

NAME: incoming_icp_average
TYPE: int
DEFAULT: 6
LOC: Config.comm_incoming.icp_average
DOC_NONE

NAME: incoming_http_average
TYPE: int
DEFAULT: 4
LOC: Config.comm_incoming.http_average
DOC_NONE

NAME: incoming_dns_average
TYPE: int
DEFAULT: 4
LOC: Config.comm_incoming.dns_average
DOC_NONE

NAME: min_icp_poll_cnt
TYPE: int
DEFAULT: 8
LOC: Config.comm_incoming.icp_min_poll
DOC_NONE

NAME: min_dns_poll_cnt
TYPE: int
DEFAULT: 8
LOC: Config.comm_incoming.dns_min_poll
DOC_NONE

NAME: min_http_poll_cnt
TYPE: int
DEFAULT: 8
LOC: Config.comm_incoming.http_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
IFDEF: SO_ACCEPTFILTER
TYPE: string
DEFAULT: none
LOC: Config.accept_filter
DOC_START
        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 recieved.
        See the accf_http(9) man page.

EXAMPLE:
accept_filter httpready
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: TheICAPConfig.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: TheICAPConfig.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: TheICAPConfig.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
TYPE: int
IFDEF: ICAP_CLIENT
LOC: TheICAPConfig.service_failure_limit
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. The per-service failure counter is reset to zero each
        time Squid fetches new service 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.
DOC_END

NAME: icap_service_revival_delay
TYPE: int
IFDEF: ICAP_CLIENT
LOC: TheICAPConfig.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: TheICAPConfig.preview_enable
DEFAULT: off
DOC_START
        Set this to 'on' if you want to enable the ICAP preview
        feature in Squid.
DOC_END

NAME: icap_preview_size
TYPE: int
IFDEF: ICAP_CLIENT
LOC: TheICAPConfig.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_default_options_ttl
TYPE: int
IFDEF: ICAP_CLIENT
LOC: TheICAPConfig.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: TheICAPConfig.reuse_connections
DEFAULT: on
DOC_START
        Whether or not Squid should use persistent connections to
        an ICAP server.
DOC_END

NAME: icap_send_client_ip
TYPE: onoff
IFDEF: ICAP_CLIENT
COMMENT: on|off
LOC: TheICAPConfig.send_client_ip
DEFAULT: off
DOC_START
        This adds the header "X-Client-IP" to ICAP requests.
DOC_END

NAME: icap_send_client_username
TYPE: onoff
IFDEF: ICAP_CLIENT
COMMENT: on|off
LOC: TheICAPConfig.send_client_username
DEFAULT: off
DOC_START
        This sends authenticated HTTP client username (if available) to
        the ICAP service. 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: TheICAPConfig.client_username_header
DEFAULT: X-Client-Username
DOC_START
        ICAP request header name to use for send_client_username.
DOC_END

NAME: icap_client_username_encode
TYPE: onoff
IFDEF: ICAP_CLIENT
COMMENT: on|off
LOC: TheICAPConfig.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: TheICAPConfig
DEFAULT: none
DOC_START
        Defines a single ICAP service

        icap_service servicename vectoring_point bypass service_url

        vectoring_point = reqmod_precache|reqmod_postcache|respmod_precache|respmod_postcache
                This specifies at which point of request processing the ICAP
                service should be plugged in.
        bypass = 1|0
                If set to 1 and the ICAP server cannot be reached, the request will go
                through without being processed by an ICAP server
        service_url = icap://servername:port/service

        Note: reqmod_precache and respmod_postcache is not yet implemented

Example:
icap_service service_1 reqmod_precache 0 icap://icap1.mydomain.net:1344/reqmod
icap_service service_2 respmod_precache 0 icap://icap2.mydomain.net:1344/respmod
DOC_END

NAME: icap_class
TYPE: icap_class_type
IFDEF: ICAP_CLIENT
LOC: TheICAPConfig
DEFAULT: none
DOC_START
        Defines an ICAP service chain. If there are multiple services per
        vectoring point, they are processed in the specified order.

        icap_class classname servicename...

Example:
icap_class class_1 service_1 service_2
icap class class_2 service_1 service_3
DOC_END

NAME: icap_access
TYPE: icap_access_type
IFDEF: ICAP_CLIENT
LOC: TheICAPConfig
DEFAULT: none
DOC_START
        Redirects a request through an ICAP service class, depending
        on given acls

        icap_access classname allow|deny [!]aclname...

        The icap_access statements are processed in the order they appear in
        this configuration file. If an access list matches, the processing stops.
        For an "allow" rule, the specified class is used for the request. A "deny"
        rule simply stops processing without using the class. You can also use the
        special classname "None".

        For backward compatibility, it is also possible to use services
        directly here.
Example:
icap_access class_1 allow all
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_DNSSERVERS
DEFAULT: @DEFAULT_DNSSERVER@
LOC: Config.Program.dnsserver
DOC_START
        Specify the location of the executable for dnslookup process.
DOC_END

NAME: dns_children
TYPE: int
IFDEF: USE_DNSSERVERS
DEFAULT: 5
LOC: Config.dnsChildren
DOC_START
        The number of processes spawn to service DNS name lookups.
        For heavily loaded caches on large servers, you should
        probably increase this value to at least 10.  The maximum
        is 32.  The default is 5.

        You must have at least one dnsserver process.
DOC_END

NAME: dns_retransmit_interval
TYPE: time_t
DEFAULT: 5 seconds
LOC: Config.Timeout.idns_retransmit
IFDEF: !USE_DNSSERVERS
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_t
DEFAULT: 2 minutes
LOC: Config.Timeout.idns_query
IFDEF: !USE_DNSSERVERS
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_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: dns_testnames
TYPE: wordlist
LOC: Config.dns_testname_list
DEFAULT: none
DEFAULT_IF_NONE: netscape.com internic.net nlanr.net microsoft.com
DOC_START
        The DNS tests exit as soon as the first site is successfully looked up

        This test can be disabled with the -D command line option.
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
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

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_size_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 zero, 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. 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
TYPE: onoff
DEFAULT: on
LOC: opt_forwarded_for
DOC_START
        If set, Squid will include your system's IP address or name
        in the HTTP requests it forwards.  By default it looks like
        this:

                X-Forwarded-For: 192.1.2.3

        If you disable this, it will appear as

                X-Forwarded-For: unknown
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
                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: 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: maximum_single_addr_tries
TYPE: int
LOC: Config.retry.maxtries
DEFAULT: 1
DOC_START
        This sets the maximum number of connection attempts for a
        host that only has one address (for multiple-address hosts,
        each address is tried once).

        The default value is one attempt, the (not recommended)
        maximum is 255 tries.  A warning message will be generated
        if it is set to a value greater than ten.

        Note: This is in addition to the request re-forwarding which
        takes place if Squid fails to get a satisfying response.
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. This is mainly useful if you
        are in a complex cache hierarchy to work around access
        control errors.
DOC_END

NAME: as_whois_server
TYPE: string
LOC: Config.as_whois_server
DEFAULT: whois.ra.net
DEFAULT_IF_NONE: 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: coredump_dir
TYPE: string
LOC: Config.coredump_dir
DEFAULT: none
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

NAME: 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

NAME: chroot
TYPE: string
LOC: Config.chroot_dir
DEFAULT: none
DOC_START
        Use this to have Squid 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 will 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: on
DOC_START
        Some load balancing servers based on round robin DNS have been
        found not to preserve user session state across requests
        to different IP addresses.

        By default Squid rotates IP's per request. By disabling
        this directive only connection failure triggers rotation.
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.
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
DOC_START
        If the memory usage (as determined by mallinfo) exceeds
        value, 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

EOF