external acl support. A mechanism where flexible ACL checks can be driven

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

#
# $Id: cf.data.pre,v 1.264 2002/06/23 13:32:24 hno Exp $
#
#
# SQUID Web Proxy Cache          http://www.squid-cache.org/
# ----------------------------------------------------------
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#  details.   Many organizations have provided support for Squid's
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#
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#  it under the terms of the GNU General Public License as published by
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#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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#

COMMENT_START
        WELCOME TO SQUID 2
        ------------------

        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: sockaddr_in_list
DEFAULT: none
LOC: Config.Sockaddr.http
DOC_START
        Usage:  port
                hostname:port
                1.2.3.4:port

        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, then 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, then you
        probably want to listen on port 80 also, or instead.

        The -a command line option will override the *first* port
        number listed here.   That option will NOT override an IP
        address, however.

        You may specify multiple socket addresses on multiple lines.

        If you run Squid on a dual-homed machine with an internal
        and an external interface then 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 3128
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:

           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=     Varions 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
                        See src/ssl_support.c or OpenSSL documentation
                        for a more complete list.
DOC_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: icp_port udp_port
TYPE: ushort
DEFAULT: 3130
LOC: Config.Port.icp
DOC_START
        The port number where Squid sends and receives ICP queries to
        and from neighbor caches.  Default is 3130.  To disable use
        "0".  May be overridden with -u on the command line.
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: 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: 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 that Squid should
        listen for UDP messages on all available interfaces.

        If udp_outgoing_address is set to 255.255.255.255 (the default)
        then 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

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

        For example,

        #                                        proxy  icp
        #          hostname             type     port   port  options
        #          -------------------- -------- ----- -----  -----------
        cache_peer parent.foo.net       parent    3128  3130  [proxy-only]
        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.

            options: proxy-only
                     weight=n
                     ttl=n
                     no-query
                     default
                     round-robin
                     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

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

                     use 'weight=n' to specify a weighted parent.
                     The weight must be an integer.  The default weight
                     is 1, larger weights are favored more.

                     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 'default' if this is a parent cache which can
                     be used as a "last-resort." You should probably
                     only use 'default' in situations where you cannot
                     use ICP with your parent cache(s).

                     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.

                     'multicast-responder' indicates that 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 that % must be written as %%.

                     use 'login=PASS' if users must authenticate against
                     the upstream proxy. This will pass the users credentials
                     as they are to the peer proxy. This only works for the
                     Basic HTTP authentication sheme. 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 that 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' to limit the amount of connections Squid
                     may open to this peer.

        NOTE: non-ICP neighbors must be specified as 'parent'.
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 that 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 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: 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: 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

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.
NOCOMMENT_START
#We recommend you to use at least the following line.
hierarchy_stoplist cgi-bin ?
NOCOMMENT_END
DOC_END


NAME: 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.

NOCOMMENT_START
#We recommend you to use the following two lines.
acl QUERY urlpath_regex cgi-bin \?
no_cache deny QUERY
NOCOMMENT_END
DOC_END


COMMENT_START
 OPTIONS WHICH AFFECT THE CACHE SIZE
 -----------------------------------------------------------------------------
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: 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

NAME: maximum_object_size
COMMENT: (bytes)
TYPE: b_size_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: minimum_object_size
COMMENT: (bytes)
TYPE: b_size_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_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: 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: 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
 LOGFILE PATHNAMES AND CACHE DIRECTORIES
 -----------------------------------------------------------------------------
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]

        cache_dir diskd Maxobjsize Directory-Name MB L1 L2 Q1 Q2

        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 eanble 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, then 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.

        '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 recevies some replies. Default is 72

        Common options:

        read-only, this cache_dir is read only.

        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.
DOC_END


NAME: cache_access_log
TYPE: string
DEFAULT: @DEFAULT_ACCESS_LOG@
LOC: Config.Log.access
DOC_START
        Logs the client request activity.  Contains an entry for
        every HTTP and ICP queries received. To disable, enter "none".
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_log
TYPE: string
LOC: Config.Log.swap
DEFAULT: none
DOC_START
        Location for the cache "swap.log."  This log 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 then 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
        then 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, then these log files will NOT correspond to
        the correct 'cache_dir' entry (unless you manually rename
        them).  We recommend that you do NOT use this option.  It is
        better to keep these log files in each 'cache_dir' directory.
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 that 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
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.
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: eol
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


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 that 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 that 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, then 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 then turn this off.
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: 5 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 then all DNS servers for the queried domain
        is assumed to be unavailable.
DOC_END

NAME: dns_defnames
COMMENT: on|off
IFDEF: USE_DNSSERVERS
TYPE: onoff
DEFAULT: off
LOC: Config.onoff.res_defnames
IFDEF: USE_DNSSERVERS
DOC_START
        Normally the 'dnsserver' disables the RES_DEFNAMES resolver
        option (see res_init(3)).  This prevents caches in a hierarchy
        from interpreting single-component hostnames locally.  To allow
        dnsserver 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.

        Example: dns_nameservers 10.0.0.1 192.172.0.4
DOC_END

NAME: hosts_file
TYPE: string
DEFAULT: /etc/hosts
LOC: Config.etcHostsPath
DOC_START
        Location of the host-local IP name-address associations
        database.  Most Operating Systems have such a file: under
        Un*X it's by default in /etc/hosts MS-Windows NT/2000 places
        that in %SystemRoot%(by default
        c:\winnt)\system32\drivers\etc\hosts, while Windows 9x/ME
        places that in %windir%(usually c:\windows)\hosts

        The file contains newline-separated definitions, in the
        form ip_address_in_dotted_form name [name ...] names are
        whitespace-separated.  lines beginnng 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: diskd_program
TYPE: string
DEFAULT: @DEFAULT_DISKD@
LOC: Config.Program.diskd
DOC_START
        Specify the location of the diskd executable.
        Note that 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: redirect_program
TYPE: wordlist
LOC: Config.Program.redirect
DEFAULT: none
DOC_START
        Specify the location of the executable for the URL redirector.
        Since they can perform almost any function there isn't one included.
        See the FAQ (section 15) for information on how to write one.
        By default, a redirector is not used.
DOC_END


NAME: 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: 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 then this may
        not be a wanted effect of a redirector.
DOC_END

NAME: 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.authConfig
DEFAULT: none
DOC_START
        This is used to pass parameters to the various authentication
        schemes.
        format: auth_param scheme parameter [setting]
        
        auth_param basic program @DEFAULT_PREFIX@/bin/ncsa_auth @DEFAULT_PREFIX@/etc/passwd     
        would tell the basic authentication scheme it's program parameter.

        The order that authentication prompts are presented to the client_agent
        is dependant 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 file below. If other browsers
        have difficulties (don't recognise the schemes offered even if you are using
        basic) then 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.

        === 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.  If you use an authenticator,
        make sure you have 1 acl of type proxy_auth.  By default, the
        authenticate_program is not used.

        If you want to use the traditional proxy authentication,
        jump over to the ../auth_modules/NCSA directory and
        type:
                % make
                % make install

        Then, set this line to something like

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

        "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 usercode/password 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

        "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). Their 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 that setting this high does not impact your susceptability 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 enable the IP ttl is strict option.

        === 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 base64 encoded. See rfc 2616 for
        the definition of H(A1).  If you use an authenticator,
        make sure you have 1 acl of type proxy_auth.  By default,
        authentication is not used.

        If you want to use build an authenticator,
        jump over to the ../digest_auth_modules directory and choose the
        authenticator to use. It it's directory type
                % make
                % make install

        Then, 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 increment-by-1 behaviour for nonce counts 
        (on - the default), or strictly incrementing (off - for use when useragents
        generate nonce counts that occasionally miss 1 (ie, 1,2,4,6)).

        === NTLM scheme options follow ===

        "program" cmdline
        Specify the command for the external ntlm authenticator.  Such a
        program reads a line containing the uuencoded NEGOTIATE and replies
        with the ntlm CHALLENGE, then waits for the response and answers with
        "OK" or "ERR" in an endless loop.  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 crendential
        verifications are done via a (slow) network you are likely to need
        lots of authenticator processes.
        auth_param ntlm children 5

        "max_challenge_reuses" number
        The maximum number of times a challenge given by a ntlm authentication
        helper can be reused. Increasing this number increases your exposure
        to replay attacks on your network. 0 means use the challenge only once.
        (disable challenge caching)
        See max_ntlm_challenge_lifetime for more information.
        auth_param ntlm max_challenge_reuses 0

        "max_challenge_lifetime" timespan
        The maximum time period that a ntlm challenge is reused over.
        The actual period will be the minimum of this time AND the number of
        reused challenges.
        auth_param ntlm max_challenge_lifetime 2 minutes

NOCOMMENT_START
#Recommended minimum configuration:
#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 ntlm program <uncomment and complete this line to activate>
#auth_param ntlm children 5
#auth_param ntlm max_challenge_reuses 0
#auth_param ntlm max_challenge_lifetime 2 minutes
#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 utilisation (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
        With this option you control how long a proxy authentication
        will be bound to a specific IP address. If a request using
        the same user name is received during this time then access
        will be denied and both users are required to reauthenticate
        them selves.  The idea behind this is to make it annoying
        for people to share their password to their friends, but
        yet allow a dialup user to reconnect on a different dialup
        port.

        The default is 0 to disable the check. Recommended value
        if you have dialup users are no more than 60 seconds to allow
        the user to redial without hassle. If all your users are
        stationary then higher values may be used.

        See also the acl max_user_ip. The max_user_ip acl replaces
        the authenticate_ip_ttl_is_strict option found in earlier
        Squid versions.
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)
          concurrenty=n Concurrency level / number of processes spawn
                        to service external acl lookups of this type.
          cache=n       result cache size, 0 is unbounded (default)
        
        The helper receives lines per the FORMAT specification, and returns
        OK or ERR indicating the validity of the request.

        FORMAT specifications

          %LOGIN        Authenticated user login name
          %IDENT        Ident user name
          %SRC          Client IP
          %DST          Requested host
          %PROTO        Requested protocol
          %PORT         Requested port
          %METHOD       Request method
          %{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, any string specified in the referencing acl will also be
        included in the helper request line, after the specified formats
        (see the acl directive)

DOC_END

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

NAME: wais_relay_host
TYPE: string
DEFAULT: none
LOC: Config.Wais.relayHost
DOC_NONE

NAME: wais_relay_port
TYPE: ushort
DEFAULT: 0
LOC: Config.Wais.relayPort
DOC_START
        Relay WAIS request to host (1st arg) at port (2 arg).
DOC_END


NAME: request_header_max_size
COMMENT: (KB)
TYPE: b_size_t
DEFAULT: 10 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: (KB)
TYPE: b_size_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

                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 was 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.
                
        Please see the file doc/Release-Notes-1.1.txt for a full
        description of Squid's refresh algorithm.  Basically a
        cached object is: (the order is changed from 1.1.X)

                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, then 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: reference_age
TYPE: time_t
LOC: Config.referenceAge
DEFAULT: 1 year
DOC_START
        As a part of normal operation, Squid performs Least Recently
        Used removal of cached objects.  The LRU age for removal is
        computed dynamically, based on the amount of disk space in
        use.  The dynamic value can be seen in the Cache Manager 'info'
        output.

        The 'reference_age' parameter defines the maximum LRU age.  For
        example, setting reference_age to '1 week' will cause objects
        to be removed if they have not been accessed for a week or
        more.  The default value is one year.

        Specify a number here, followed by units of time.  For example:
                1 week
                3.5 days
                4 months
                2.2 hours

        NOTE: this parameter is not used when using the enhanced
        replacement policies, GDSH or LFUDA.
DOC_END


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

NAME: quick_abort_max
COMMENT: (KB)
TYPE: kb_size_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 then set 'quick_abort_min' to '-1 KB'.
DOC_END

NAME: read_ahead_gap
COMMENT: buffer-size
TYPE: kb_size_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
        Time-to-Live (TTL) for positive caching of successful DNS lookups.
        Default is 6 hours (360 minutes).  If you want to minimize the
        use of Squid's ipcache, set this to 1, not 0.
DOC_END


NAME: negative_dns_ttl
COMMENT: time-units
TYPE: time_t
LOC: Config.negativeDnsTtl
DEFAULT: 5 minutes
DOC_START
        Time-to-Live (TTL) for negative caching of failed DNS lookups.
DOC_END

NAME: range_offset_limit
COMMENT: (bytes)
TYPE: b_size_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 then 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 that 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


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

NAME: connect_timeout
COMMENT: time-units
TYPE: time_t
LOC: Config.Timeout.connect
DEFAULT: 2 minutes
DOC_START
        Some systems (notably Linux) can not be relied upon to properly
        time out connect(2) requests.  Therefore the Squid process
        enforces its own timeout on server connections.  This parameter
        specifies how long to wait for the connect to complete.  The
        default is two minutes (120 seconds).
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: siteselect_timeout
COMMENT: time-units
TYPE: time_t
LOC: Config.Timeout.siteSelect
DEFAULT: 4 seconds
DOC_START
        For URN to multiple URL's URL selection
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 that 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, then 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 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. The name "none" is used if the reverse lookup
          # fails.

        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
        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 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
          # authenticate_program).
          #
          # WARNING: proxy_auth can't be used in a transparent proxy. It
          # collides with any authentication done by origin servers. It may
          # seem like it works at first, but it doesn't.

        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 address's. The authenticate_ip_ttl
          # parameter controls the timeout on the ip entries.
          # If -s is specified then 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" deny requests.
          # (the counter is then 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 address's if they are
          # going through proxy farms, so a limit of 1 may cause user problems.

        acl aclname req_mime_type mime-type1 ...
          # regex match agains the mime type of the request generated
          # by the client. Can be used to detect file upload or some
          # types HTTP tunelling requests.
          # NOTE: This does NOT match the reply. You cannot use this
          # to match the returned file type.

        acl aclname rep_mime_type mime-type1 ...
          # regex match against the mime type of the reply recieved by
          # squid. Can be used to detect file download or some
          # types HTTP tunelling 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 acl_name external class_name [arguments...]
          # external ACL lookup via a helper class defined by the
          # external_acl_type directive.

Examples:
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 443 563
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443 563     # https, snews
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, then 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 to uncomment the following to protect innocent
# web applications running on the proxy server who think that 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

# Exampe 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, then 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.

NOCOMMENT_START
#Recommended minimum configuration:
#
# Insert your own rules here.
#
#
# and finally allow by default
http_reply_access allow all
NOCOMMENT_END
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 eveyone
icp_access allow all
NOCOMMENT_END
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 that 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, see RFC 2474

        The TOS/DSCP byte must be exactly that - a byte, value  0 - 255, or
        "default" to use whatever default your host has.

        Processing proceeds in the order specified, and stops at first fully
        matching line.
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 sourceaddress of the user making
        the request.
        
        tcp_outgoing_address ipaddr [[!]aclname] ...

        Example where requests from 10.0.0.0/24 will be forwareded
        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.
DOC_END

NAME: reply_body_max_size
COMMENT: bytes allow|deny acl acl...
TYPE: body_size_t
DEFAULT: none
DEFAULT_IF_NONE: 0 allow all
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 recieved,
        the reply_body_max_size lines are processed, and the first line with
        a result of "allow" is used as the maximum body size for this reply.
        This size is then 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 larger 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 to zero (the default), there will be
        no limit imposed.
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: cache_effective_user
TYPE: string
DEFAULT: nobody
LOC: Config.effectiveUser
DOC_NONE

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

        If the cache is run as root, it will change its effective/real
        UID/GID to the UID/GID specified below.  The default is to
        change to UID to nobody and GID to the default group of nobody.

        If Squid is not started as root, the default is to keep the
        current UID/GID, and only the GID can be changed to any of
        the groups the user starting Squid is member of.  Note that if
        Squid is not started as root then you cannot set http_port to
        a value lower than 1024.
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,
        then 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' then you must give each machine a different
        'unique_hostname' so that 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 that 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_host
TYPE: string
LOC: Config.Accel.host
DEFAULT: none
DOC_NONE

NAME: httpd_accel_port
TYPE: ushort
LOC: Config.Accel.port
DEFAULT: 80
DOC_START
        If you want to run Squid as an httpd accelerator, define the
        host name and port number where the real HTTP server is.

        If you want virtual host support then specify the hostname
        as "virtual".

        If you want virtual port support then specify the port as "0".

        NOTE: enabling httpd_accel_host disables proxy-caching and
        ICP.  If you want these features enabled also, then set
        the 'httpd_accel_with_proxy' option.
DOC_END

NAME: httpd_accel_single_host
COMMENT: on|off
TYPE: onoff
LOC: Config.Accel.single_host
DEFAULT: off
DOC_START
        If you are running Squid as an accelerator and have a single backend
        server then set this to on. This causes Squid to forward the request
        to this server irregardles of what any redirectors or Host headers
        says.

        Leave this at off if you have multiple backend servers, and use a
        redirector (or host table or private DNS) to map the requests to the
        appropriate backend servers. Note that the mapping needs to be a
        1-1 mapping between requested and backend (from redirector) domain
        names or caching will fail, as cacing is performed using the
        URL returned from the redirector.

        See also redirect_rewrites_host_header.
DOC_END

NAME: httpd_accel_with_proxy
COMMENT: on|off
TYPE: onoff
DEFAULT: off
LOC: Config.onoff.accel_with_proxy
DOC_START
        If you want to use Squid as both a local httpd accelerator
        and as a proxy, change this to 'on'. Note however that your
        proxy users may have trouble to reach the accelerated domains
        unless their browsers are configured not to use this proxy for
        those domains (for example via the no_proxy browser configuration
        setting)
DOC_END

NAME: httpd_accel_uses_host_header
COMMENT: on|off
TYPE: onoff
DEFAULT: off
LOC: opt_accel_uses_host
DOC_START
        HTTP/1.1 requests include a Host: header which is basically the
        hostname from the URL.  Squid can be an accelerator for
        different HTTP servers by looking at this header.  However,
        Squid does NOT check the value of the Host header, so it opens
        a big security hole.  We recommend that this option remain
        disabled unless you are sure of what you are doing.

        However, you will need to enable this option if you run Squid
        as a transparent proxy.  Otherwise, virtual servers which
        require the Host: header will not be properly cached.
DOC_END

COMMENT_START
 MISCELLANEOUS
 -----------------------------------------------------------------------------
COMMENT_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: 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 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: 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 that there today is 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: 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

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: 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.  A single ACL will cause
        the http_access check to fail.  If a 'deny_info' line exists
        for that ACL then Squid returns a corresponding error page.

        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 then
        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

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: none
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 not set (default) or 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: 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: 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, then
        it is probably okay to set this to 'on'.
        If set to 'on', then your siblings should use the option "allow-miss"
        on their cache_peer lines for connecting to you.
DOC_END


NAME: minimum_direct_hops
TYPE: int
DEFAULT: 4
LOC: Config.minDirectHops
DOC_START
        If using the ICMP pinging stuff, do direct fetches for sites
        which are no more than this many hops away.
DOC_END

NAME: minimum_direct_rtt
TYPE: int
DEFAULT: 400
LOC: Config.minDirectRtt
DOC_START
        If using the ICMP pinging stuff, do direct fetches for sites
        which are no more than this many rtt milliseconds away.
DOC_END

NAME: 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
                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: 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.  See doc/Release-Notes-1.1.txt.  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 50.
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, then
        turn off client_db here.
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' then that peer will send ICMP pings to origin server
        sites of the URLs it receives.  If you enable this option then 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: buffered_logs
COMMENT: on|off
TYPE: onoff
DEFAULT: off
LOC: Config.onoff.buffered_logs
DOC_START
        cache.log log file is written with stdio functions, and as such
        it can be buffered or unbuffered. By default it will be unbuffered.
        Buffering it can speed up the writing slightly (though you are
        unlikely to need to worry unless you run with tons of debugging
        enabled in which case performance will suffer badly anyway..).
DOC_END

NAME: 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: 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 directly to origin servers.  For example,
        to always directly forward requests for local servers 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

        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 is local intranet
        servers inside the firewall then 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

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

        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 behaviour as the old
        'http_anonymizer standard' option, you should use:

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

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

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

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

NAME: header_replace
TYPE: http_header_replace[]
LOC: Config.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.

        By default, headers are removed if denied.
DOC_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: 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.
DOC_END

NAME: minimum_retry_timeout
COMMENT: (seconds)
TYPE: time_t
LOC: Config.retry.timeout
DEFAULT: 5 seconds
DOC_START
        This specifies the minimum connect timeout, for when the
        connect timeout is reduced to compensate for the availability
        of multiple IP addresses.

        When a connection to a host is initiated, and that host has
        several IP addresses, the default connection timeout is reduced
        by dividing it by the number of addresses.  So, a site with 15
        addresses would then have a timeout of 8 seconds for each
        address attempted.  To avoid having the timeout reduced to the
        point where even a working host would not have a chance to
        respond, this setting is provided.  The default, and the
        minimum value, is five seconds, and the maximum value is sixty
        seconds, or half of connect_timeout, whichever is greater and
        less than connect_timeout.
DOC_END

NAME: maximum_single_addr_tries
TYPE: int
LOC: Config.retry.maxtries
DEFAULT: 3
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 three tries, the (not recommended)
        maximum is 255 tries.  A warning message will be generated
        if it is set to a value greater than ten.
DOC_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)
        then 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

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: wccp_router
TYPE: address
LOC: Config.Wccp.router
DEFAULT: 0.0.0.0
IFDEF: USE_WCCP
DOC_START
        Use this option to define your WCCP ``home'' router for
        Squid.   Setting the 'wccp_router' to 0.0.0.0 (the default)
        disables WCCP.
DOC_END

NAME: wccp_version
TYPE: int
LOC: Config.Wccp.version
DEFAULT: 4
IFDEF: USE_WCCP
DOC_START
        According to some users, Cisco IOS 11.2 only supports WCCP
        version 3.  If you're using that version of IOS, change
        this value to 3.
DOC_END

NAME: wccp_incoming_address
TYPE: address
LOC: Config.Wccp.incoming
DEFAULT: 0.0.0.0
IFDEF: USE_WCCP
DOC_NONE
NAME: wccp_outgoing_address
TYPE: address
LOC: Config.Wccp.outgoing
DEFAULT: 255.255.255.255
IFDEF: USE_WCCP
DOC_START
        wccp_incoming_address   Use this option if you require WCCP
                                messages to be received on only one
                                interface.  Do NOT use this option if
                                you're unsure how many interfaces you
                                have, or if you know you have only one
                                interface.

        wccp_outgoing_address   Use this option if you require WCCP
                                messages to be sent out on only one
                                interface.  Do NOT use this option if
                                you're unsure how many interfaces you
                                have, or if you know you have only one
                                interface.

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

        NOTE, wccp_incoming_address and wccp_outgoing_address can not have
        the same value since they both use port 2048.
DOC_END


COMMENT_START
 DELAY POOL PARAMETERS (all require DELAY_POOLS compilation option)
 -----------------------------------------------------------------------------
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 2      # 2 delay pools
 delay_class 1 2    # pool 1 is a class 2 pool
 delay_class 2 3    # pool 2 is a class 3 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.

        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.
        The first matched delay pool is always used, i.e., if a request falls
        into delay pool number one, no more delay are checked, otherwise the
        rest are checked in order of their delay pool number until they have
        all been checked.  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
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

        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).

        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 600/64000

        There must be one delay_parameters line for each delay pool.
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

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: 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: 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 RFC2616.
        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: 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 RFC 2068 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: 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_TTL
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: 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 cachable request type) direct
        to origin servers.

        If you set this to off, then 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 then 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 by some
        reason like it to first try going direct and only use a parent if
        going direct fails then set this to off.

        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.
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: 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,
        then users may have access to pages that they should not
        be allowed to request.
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 that they are sent to.  If they
        don't match, Squid ignores the response and writes a warning
        message to cache.log.  You can allow responses from unknown
        nameservers by setting this option to 'off'.
DOC_END

NAME: 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

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, that if you use a HTTP
        port less than 1024 and try to reconfigure, you will get an
        error.
DOC_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: pipeline_prefetch
TYPE: onoff
LOC: Config.onoff.pipeline_prefetch
DEFAULT: on
DOC_START
        To boost the performance of pipelined requests to closer
        match that of a non-proxied environment Squid tries to fetch
        up to two requests in parallell from a pipeline.
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: 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: 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: 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: 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 that 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: 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, that if you have a lot of child
        processes, then 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.
DOC_END

EOF