RH 253: HOW TO CONFIGURE SQUID SERVER

    TO CONFIGURE SQUID SERVER

Squid Server
1. yum install squid -y
2. vim /etc/squid.conf      //Configure server
3. Applications-->Internet-->Edit--Preference-->connectionsettings
   (Give squid servers ip, So all connections to internet will pass
    Through the squid server )
4. service squid restart


Squid Client
1. Applications-->Internet-->Edit--Preference-->connectionsettings
   (Give squid servers ip, So all connections to internet will pass
    Through the squid server )


Squid Authentication
1. line 1572  -> auth_param basicprogram /usr/lib/squid/pam_auth
   line 2410  -> acl password proxy_auth REQUIRED
   line 2527  -> http_access allow password.

2. Service squid restart





#    WELCOME TO SQUID 2.6.STABLE6
#    ----------------------------
#
#    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.
#


# NETWORK OPTIONS
# -----------------------------------------------------------------------------

#  TAG: http_port
#    Usage:    port [options]
#        hostname:port [options]
#        1.2.3.4:port [options]
#
#    The socket addresses where Squid will listen for HTTP client
#    requests.  You may specify multiple socket addresses.
#    There are three forms: port alone, hostname with port, and
#    IP address with port.  If you specify a hostname or IP
#    address, Squid binds the socket to that specific
#    address.  This replaces the old 'tcp_incoming_address'
#    option.  Most likely, you do not need to bind to a specific
#    address, so you can use the port number alone.
#
#    The default port number is 3128.
#
#    If you are running Squid in accelerator mode, 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.
#
#    options are:
#        transparent    Support for transparent proxies
#        vhost        Accelerator using Host directive
#        vport        Accelerator with IP virtual host support
#        vport=        As above, but uses specified port number
#                rather than the http_port number.
#        defaultsite=    Main web site name for accelerators.
#        urlgroup=    Default urlgroup to mark requests
#                with (see also acl urlgroup and
#                url_rewrite_program)
#        protocol=    Protocol to reconstruct accelerated
#                requests with. Defaults to http.
#        no-connection-auth
#                Prevent forwarding of Microsoft
#                connection oriented authentication
#                (NTLM, Negotiate and Kerberos)
#        tproxy        Support Linux TPROXY for spoofing
#                outgoing connections using the client
#                IP address.
#
#    If you run Squid on a dual-homed machine with an internal
#    and an external interface we recommend you to specify the
#    internal address:port in http_port. This way Squid will only be
#    visible on the internal address.
#
# Squid normally listens to port 3128
http_port 443

#  TAG: https_port
#    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:
#
#       defaultsite=    The name of the https site presented on
#            this port.
#
#       urlgroup=    Default urlgroup to mark requests with (see
#            also acl urlgroup and url_rewrite_program)
#
#       protocol=    Protocol to reconstruct accelerated requests
#            with. Defaults to https.
#
#       cert=    Path to SSL certificate (PEM format)
#
#       key=        Path to SSL private key file (PEM format)
#            if not specified, the certificate file is
#            assumed to be a combined certificate and
#            key file
#
#       version=    The version of SSL/TLS supported
#                1    automatic (default)
#                2    SSLv2 only
#                3    SSLv3 only
#                4    TLSv1 only
#
#       cipher=    Colon separated list of supported ciphers
#
#       options=    Various SSL engine options. The most important
#            being:
#                NO_SSLv2  Disallow the use of SSLv2
#                NO_SSLv3  Disallow the use of SSLv3
#                NO_TLSv1  Disallow the use of TLSv1
#                SINGLE_DH_USE Always create a new key when using
#                      temporary/ephemeral DH key exchanges
#            See src/ssl_support.c or OpenSSL SSL_CTX_set_options
#            documentation for a complete list of options.
#
#       clientca=    File containing the list of CAs to use when
#            requesting a client certificate
#
#       cafile=    File containing additional CA certificates to
#            use when verifying client certificates. If unset
#            clientca will be used.
#
#       capath=    Directory containing additional CA certificates
#            and CRL lists to use when verifying client certificates
#
#       crlfile=    File of additional CRL lists to use when verifying
#            the client certificate, in addition to CRLs stored in
#            the capath. Implies VERIFY_CRL flag below.
#
#       dhparams=    File containing DH parameters for temporary/ephemeral
#            DH key exchanges
#
#       sslflags=    Various flags modifying the use of SSL:
#                DELAYED_AUTH
#                Don't request client certificates
#                immediately, but wait until acl processing
#                requires a certificate (not yet implemented)
#                NO_DEFAULT_CA   
#                Don't use the default CA lists built in
#                to OpenSSL.
#                NO_SESSION_REUSE
#                Don't allow for session reuse. Each connection
#                will result in a new SSL session.
#                VERIFY_CRL
#                Verify CRL lists when accepting client
#                certificates
#                VERIFY_CRL_ALL
#                Verify CRL lists for all certificates in the
#                client certificate chain
#
#       sslcontext=    SSL session ID context identifier.
#
#
#Default:
# none

#  TAG: ssl_unclean_shutdown
#    Some browsers (especially MSIE) bugs out on SSL shutdown
#    messages.
#
#Default:
# ssl_unclean_shutdown off

#  TAG: ssl_engine
#    The OpenSSL engine to use. You will need to set this if you
#    would like to use hardware SSL acceleration for example.
#
#Default:
# none

#  TAG: sslproxy_client_certificate
#    Client SSL Certificate to use when proxying https:// URLs
#
#Default:
# none

#  TAG: sslproxy_client_key
#    Client SSL Key to use when proxying https:// URLs
#
#Default:
# none

#  TAG: sslproxy_version
#    SSL version level to use when proxying https:// URLs
#
#Default:
# sslproxy_version 1

#  TAG: sslproxy_options
#    SSL engine options to use when proxying https:// URLs
#
#Default:
# none

#  TAG: sslproxy_cipher
#    SSL cipher list to use when proxying https:// URLs
#
#Default:
# none

#  TAG: sslproxy_cafile
#  TAG: sslproxy_capath
#  TAG: sslproxy_flags
#  TAG: sslpassword_program
#    Specify a program used for entering SSL key passphrases
#    when using encrypted SSL certificate keys. If not specified
#    keys must either be unencrypted, or Squid started with the -N
#    option to allow it to query interactively for the passphrase.
#
#Default:
# none

#  TAG: icp_port
#    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.
#
#Default:
# icp_port 3130

#  TAG: htcp_port
# Note: This option is only available if Squid is rebuilt with the
#       --enable-htcp option
#
#    The port number where Squid sends and receives HTCP queries to
#    and from neighbor caches.  Default is 4827.  To disable use
#    "0".
#
#Default:
# htcp_port 4827

#  TAG: mcast_groups
#    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.
#
#Default:
# none

#  TAG: udp_incoming_address
#  TAG: udp_outgoing_address
#    udp_incoming_address    is used for the ICP socket receiving packets
#                from other caches.
#    udp_outgoing_address    is used for ICP packets sent out to other
#                caches.
#
#    The default behavior is to not bind to any specific address.
#
#    A udp_incoming_address value of 0.0.0.0 indicates Squid
#    should listen for UDP messages on all available interfaces.
#
#    If udp_outgoing_address is set to 255.255.255.255 (the default)
#    it will use the same socket as udp_incoming_address. Only
#    change this if you want to have ICP queries sent using another
#    address than where this Squid listens for ICP queries from other
#    caches.
#
#    NOTE, udp_incoming_address and udp_outgoing_address can not
#    have the same value since they both use port 3130.
#
#Default:
# udp_incoming_address 0.0.0.0
# udp_outgoing_address 255.255.255.255


# OPTIONS WHICH AFFECT THE NEIGHBOR SELECTION ALGORITHM
# -----------------------------------------------------------------------------

#  TAG: cache_peer
#    To specify other caches in a hierarchy, use the format:
#
#        cache_peer hostname type http_port icp_port [options]
#
#    For example,
#
#    #                                        proxy  icp
#    #          hostname             type     port   port  options
#    #          -------------------- -------- ----- -----  -----------
#    cache_peer parent.foo.net       parent    3128  3130  [proxy-only]
#    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
#             htcp
#             htcp-oldsquid
#             carp-load-factor
#             originserver
#             userhash
#             sourcehash
#             name=xxx
#             monitorurl=url
#             monitorsize=sizespec
#             monitorinterval=seconds
#             monitortimeout=seconds
#             group=name
#             forceddomain=name
#             ssl
#             sslcert=/path/to/ssl/certificate
#             sslkey=/path/to/ssl/key
#             sslversion=1|2|3|4
#             sslcipher=...
#             ssloptions=...
#             front-end-https[=on|auto]
#             connection-auth[=on|off|auto]
#
#             use 'proxy-only' to specify 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 the named peer
#             is a member of a multicast group.  ICP queries will
#             not be sent directly to the peer, but ICP replies
#             will be accepted from it.
#
#             'closest-only' indicates that, for ICP_OP_MISS
#             replies, we'll only forward CLOSEST_PARENT_MISSes
#             and never FIRST_PARENT_MISSes.
#
#             use 'no-digest' to NOT request cache digests from
#             this neighbor.
#
#             'no-netdb-exchange' disables requesting ICMP
#             RTT database (NetDB) from the neighbor.
#
#             use 'no-delay' to prevent access to this neighbor
#             from influencing the delay pools.
#
#             use 'login=user:password' if this is a personal/workgroup
#             proxy and your parent requires proxy authentication.
#             Note: The string can include URL escapes (i.e. %20 for
#             spaces). This also means % must be written as %%.
#
#             use 'login=PASS' to forward authentication to the peer.
#             Needed if the peer requires login.
#             Note: To combine this with local authentication the Basic
#             authentication scheme must be used, and both servers must
#             share the same user database as HTTP only allows for
#             a single login (one for proxy, one for origin server).
#
#             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.
#
#             use 'htcp' to send HTCP, instead of ICP, queries
#             to the neighbor.  You probably also want to
#             set the "icp port" to 4827 instead of 3130.
#
#             use 'htcp-oldsquid' to send HTCP to old Squid versions
#
#             use 'carp-load-factor=f' to define a parent
#             cache as one participating in a CARP array.
#             The 'f' values for all CARP parents must add
#             up to 1.0.
#       
#             'originserver' causes this parent peer to be contacted as
#             a origin server. Meant to be used in accelerator setups.
#
#             use 'userhash' to load-balance amongst a set of parents
#             based on the client proxy_auth or ident username.
#
#             use 'sourcehash' to load-balanse amongs a set of parents
#             based on the client source ip.
#
#             use 'name=xxx' if you have multiple peers on the same
#             host but different ports. This name can then be used to
#             differentiate the peers in cache_peer_access and similar
#             directives.
#
#             use 'monitorurl=url' to have periodically request a given
#             URL from the peer, and only consider the peer as alive
#             if this monitoring is successful (default none)
#
#             use 'monitorsize=min[-max]' to limit the size range of
#             'monitorurl' replies considered valid. Defaults to 0 to
#             accept any size replies as valid.
#
#             use 'monitorinterval=seconds' to change frequency of
#             how often the peer is monitored with 'monitorurl'
#             (default 300 for a 5 minute interval). If set to 0
#             then monitoring is disabled even if a URL is defined.
#
#             use 'monitortimeout=seconds' to change the timeout of
#             'monitorurl'. Defaults to 'monitorinterval'.
#
#             use 'forceddomain=name' to forcibly set the Host header
#             of requests forwarded to this peer. Useful in accelerator
#             setups where the server (peer) expects a certain domain
#             name and using redirectors to feed this domain name
#             is not feasible.
#
#             use 'ssl' to indicate that connections to this peer should
#             bs SSL/TLS encrypted.
#
#             use 'sslcert=/path/to/ssl/certificate' to specify a client
#             SSL certificate to use when connecting to this peer.
#
#             use 'sslkey=/path/to/ssl/key' to specify the private SSL
#             key corresponding to sslcert above. If 'sslkey' is not
#             specified then 'sslcert' is assumed to reference a
#             combined file containing both the certificate and the key.
#
#             use sslversion=1|2|3|4 to specify the SSL version to use
#             when connecting to this peer
#            1 = automatic (default)
#            2 = SSL v2 only
#            3 = SSL v3 only
#            4 = TLS v1 only
#
#             use sslcipher=... to specify the list of valid SSL ciphers
#             to use when connecting to this peer.
#
#             use ssloptions=... to specify various SSL engine options:
#            NO_SSLv2  Disallow the use of SSLv2
#            NO_SSLv3  Disallow the use of SSLv3
#            NO_TLSv1  Disallow the use of TLSv1
#             See src/ssl_support.c or the OpenSSL documentation for
#             a more complete list.
#
#             use sslcafile=... to specify a file containing
#             additional CA certificates to use when verifying the
#             peer certificate.
#
#             use sslcapath=... to specify a directory containing
#             additional CA certificates to use when verifying the
#             peer certificate.
#
#             use sslcrlfile=... to specify a certificate revocation
#             list file to use when verifying the peer certificate.
#
#             use sslflags=... to specify various flags modifying the
#             SSL implementation:
#            DONT_VERIFY_PEER
#                Accept certificates even if they fail to
#                verify.
#            NO_DEFAULT_CA   
#                Don't use the default CA list built in
#                to OpenSSL.
#
#             use ssldomain= to specify the peer name as advertised
#             in it's certificate. Used for verifying the correctness
#             of the received peer certificate. If not specified the
#             peer hostname will be used.
#
#             use front-end-https to enable the "Front-End-Https: On"
#             header needed when using Squid as a SSL frontend in front
#             of Microsoft OWA. See MS KB document Q307347 for details
#             on this header. If set to auto then the header will
#             only be added if the request is forwarded as a https://
#             URL.
#
#             use connection-auth=off to tell Squid that this peer does
#             not support Microsoft connection oriented authentication,
#             and any such challenges received from there should be
#             ignored. Default is auto to automatically determine the
#             status of the peer.
#
#    NOTE: non-ICP/HTCP neighbors must be specified as 'parent'.
#
#Default:
# none

#  TAG: cache_peer_domain
#    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 domain name
#    with '!' means the cache will be queried for objects
#    NOT in that domain.
#
#    NOTE:    * Any number of domains may be given for a cache-host,
#          either on the same or separate lines.
#        * When multiple domains are given for a particular
#          cache-host, the first matched domain is applied.
#        * Cache hosts with no domain restrictions are queried
#          for all requests.
#        * There are no defaults.
#        * There is also a 'cache_peer_access' tag in the ACL
#          section.
#
#Default:
# none

#  TAG: neighbor_type_domain
#    usage: neighbor_type_domain neighbor parent|sibling domain domain ...
#
#    Modifying the neighbor type for specific domains is now
#    possible.  You can treat some domains differently than the the
#    default neighbor type specified on the 'cache_peer' line.
#    Normally it should only be necessary to list domains which
#    should be treated differently because the default neighbor type
#    applies for hostnames which do not match domains listed here.
#
#EXAMPLE:
#    cache_peer  parent cache.foo.org 3128 3130
#    neighbor_type_domain cache.foo.org sibling .com .net
#    neighbor_type_domain cache.foo.org sibling .au .de
#
#Default:
# none

#  TAG: icp_query_timeout    (msec)
#    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
#
#Default:
# icp_query_timeout 0

#  TAG: maximum_icp_query_timeout    (msec)
#    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.
#
#Default:
# maximum_icp_query_timeout 2000

#  TAG: mcast_icp_query_timeout    (msec)
#    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.
#
#Default:
# mcast_icp_query_timeout 2000

#  TAG: dead_peer_timeout    (seconds)
#    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.
#
#Default:
# dead_peer_timeout 10 seconds

#  TAG: hierarchy_stoplist
#    A list of words which, if found in a URL, cause the object to
#    be handled directly by this cache.  In other words, use this
#    to not query neighbor caches for certain objects.  You may
#    list this option multiple times. Note: never_direct overrides
#    this option.
#We recommend you to use at least the following line.
hierarchy_stoplist cgi-bin ?

#  TAG: cache
#    A list of ACL elements which, if matched, cause the request to
#    not be satisfied from the cache and the reply to not be cached.
#    In other words, use this to force certain objects to never be cached.
#
#    You must use the word 'DENY' to indicate the ACL names which should
#    NOT be cached.
#
#    Default is to allow all to be cached
#We recommend you to use the following two lines.
acl QUERY urlpath_regex cgi-bin \?
cache deny QUERY

#  TAG: cache_vary
#    Set to off to disable caching of Vary:in objects.
#
#Default:
# cache_vary on

#  TAG: broken_vary_encoding
#    Many servers have broken support for on-the-fly Content-Encoding,
#    returning the same ETag on both plain and gzip:ed variants.
#    Vary replies matching this access list will have the cache split
#    on the Accept-Encoding header of the request and not trusting the
#    ETag to be unique.
#
# Apache mod_gzip and mod_deflate known to be broken so don't trust
# Apache to signal ETag correctly on such responses
acl apache rep_header Server ^Apache
broken_vary_encoding allow apache


# OPTIONS WHICH AFFECT THE CACHE SIZE
# -----------------------------------------------------------------------------

#  TAG: cache_mem    (bytes)
#    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.
#
#Default:
# cache_mem 8 MB

#  TAG: cache_swap_low    (percent, 0-100)
#  TAG: cache_swap_high    (percent, 0-100)
#
#    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.
#
#Default:
# cache_swap_low 90
# cache_swap_high 95

#  TAG: maximum_object_size    (bytes)
#    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.
#
#Default:
# maximum_object_size 4096 KB

#  TAG: minimum_object_size    (bytes)
#    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.
#
#Default:
# minimum_object_size 0 KB

#  TAG: maximum_object_size_in_memory    (bytes)
#    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.
#
#Default:
# maximum_object_size_in_memory 8 KB

#  TAG: ipcache_size    (number of entries)
#  TAG: ipcache_low    (percent)
#  TAG: ipcache_high    (percent)
#    The size, low-, and high-water marks for the IP cache.
#
#Default:
# ipcache_size 1024
# ipcache_low 90
# ipcache_high 95

#  TAG: fqdncache_size    (number of entries)
#    Maximum number of FQDN cache entries.
#
#Default:
# fqdncache_size 1024

#  TAG: cache_replacement_policy
#    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.
#
#Default:
# cache_replacement_policy lru

#  TAG: memory_replacement_policy
#    The memory replacement policy parameter determines which
#    objects are purged from memory when memory space is needed.
#
#    See cache_replacement_policy for details.
#
#Default:
# memory_replacement_policy lru


# LOGFILE PATHNAMES AND CACHE DIRECTORIES
# -----------------------------------------------------------------------------

#  TAG: cache_dir
#    Usage:
#
#    cache_dir Type Directory-Name Fs-specific-data [options]
#
#    You can specify multiple cache_dir lines to spread the
#    cache among different disk partitions.
#
#    Type specifies the kind of storage system to use. Only "ufs"
#    is built by default. To enable any of the other storage systems
#    see the --enable-storeio configure option.
#
#    'Directory' is a top-level directory where cache swap
#    files will be stored. If you want to use an entire disk
#    for caching, this can be the mount-point directory.
#    The directory must exist and be writable by the Squid
#    process. Squid will NOT create this directory for you.
#    Only using COSS, a raw disk device or a stripe file can
#    be specified, but the configuration of the "cache_wap_log"
#    tag is mandatory.
#
#    The ufs store type:
#
#    "ufs" is the old well-known Squid storage format that has always
#    been there.
#
#    cache_dir ufs Directory-Name Mbytes L1 L2 [options]
#
#    'Mbytes' is the amount of disk space (MB) to use under this
#    directory.  The default is 100 MB.  Change this to suit your
#    configuration.  Do NOT put the size of your disk drive here.
#    Instead, if you want Squid to use the entire disk drive,
#    subtract 20% and use that value.
#
#    'Level-1' is the number of first-level subdirectories which
#    will be created under the 'Directory'.  The default is 16.
#
#    'Level-2' is the number of second-level subdirectories which
#    will be created under each first-level directory.  The default
#    is 256.
#
#    The aufs store type:
#
#    "aufs" uses the same storage format as "ufs", utilizing
#    POSIX-threads to avoid blocking the main Squid process on
#    disk-I/O. This was formerly known in Squid as async-io.
#
#    cache_dir aufs Directory-Name Mbytes L1 L2 [options]
#
#    see argument descriptions under ufs above
#
#    The diskd store type:
#
#    "diskd" uses the same storage format as "ufs", utilizing a
#    separate process to avoid blocking the main Squid process on
#    disk-I/O.
#
#    cache_dir diskd Directory-Name Mbytes L1 L2 [options] [Q1=n] [Q2=n]
#
#    see argument descriptions under ufs above
#
#    Q1 specifies the number of unacknowledged I/O requests when Squid
#    stops opening new files. If this many messages are in the queues,
#    Squid won't open new files. Default is 64
#
#    Q2 specifies the number of unacknowledged messages when Squid
#    starts blocking.  If this many messages are in the queues,
#    Squid blocks until it receives some replies. Default is 72
#
#    When Q1 < Q2 (the default), the cache directory is optimized
#    for lower response time at the expense of a decrease in hit
#    ratio.  If Q1 > Q2, the cache directory is optimized for
#    higher hit ratio at the expense of an increase in response
#    time.
#
#    The COSS store type:
#
#    block-size=n defines the "block size" for COSS cache_dir's.
#    Squid uses file numbers as block numbers.  Since file numbers
#    are limited to 24 bits, the block size determines the maximum
#    size of the COSS partition.  The default is 512 bytes, which
#    leads to a maximum cache_dir size of 512<<24, or 8 GB.  Note
#    you should not change the COSS block size after Squid
#    has written some objects to the cache_dir.
#
#    overwrite-percent=n defines the percentage of disk that COSS
#    must write to before a given object will be moved to the
#    current stripe.  A value of "n" closer to 100 will cause COSS
#    to waste less disk space by having multiple copies of an object
#    on disk, but will increase the chances of overwriting a popular
#    object as COSS overwrites stripes.  A value of "n" close to 0
#    will cause COSS to keep all current objects in the current COSS
#    stripe at the expense of the hit rate.  The default value of 50
#    will allow any given object to be stored on disk a maximum of
#    2 times.
#
#    max-stripe-waste=n defines the maximum amount of space that COSS
#    will waste in a given stripe (in bytes).  When COSS writes data
#    to disk, it will potentially waste up to "max-size" worth of disk
#    space for each 1MB of data written.  If "max-size" is set to a
#    large value (ie >256k), this could potentially result in large
#    amounts of wasted disk space. Setting this value to a lower value
#    (ie 64k or 32k) will result in a COSS disk refusing to cache
#    larger objects until the COSS stripe has been filled to within
#    "max-stripe-waste" of the maximum size (1MB).
#
#    membufs=n defines the number of "memory-only" stripes that COSS
#    will use.  When an cache hit is performed on a COSS stripe before
#    COSS has reached the overwrite-percent value for that object,
#    COSS will use a series of memory buffers to hold the object in
#    while the data is sent to the client.  This will define the maximum
#    number of memory-only buffers that COSS will use.  The default value
#    is 10, which will use a maximum of 10MB of memory for buffers.
#
#    maxfullbufs=n defines the maximum number of stripes a COSS partition
#    will have in memory waiting to be freed (either because the disk is
#    under load and the stripe is unwritten, or because clients are still
#    transferring data from objects using the memory).  In order to try
#    and maintain a good hit rate under load, COSS will reserve the last
#    2 full stripes for object hits. (ie a COSS cache_dir will reject
#    new objects when the number of full stripes is 2 less than maxfullbufs)
#
#    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.
#
#    Note that for coss, max-size must be less than COSS_MEMBUF_SZ
#    (hard coded at 1 MB).
#
#Default:
# cache_dir ufs /var/spool/squid 100 16 256

#  TAG: logformat
#    Usage:
#
#    logformat <name> <format specification>
#
#    Defines an access log format.
#
#    The <format specification> is a string with embedded % format codes
#   
#    % format codes all follow the same basic structure where all but
#    the formatcode is optional. Output strings are automatically escaped
#    as required according to their context and the output format
#    modifiers are usually not needed, but can be specified if an explicit
#    output format is desired.
#
#        % ["|[|'|#] [-] [[0]width] [{argument}] formatcode
#   
#        "    output in quoted string format
#        [    output in squid text log format as used by log_mime_hdrs
#        #    output in URL quoted format
#        '    output as-is
#
#        -    left aligned
#        width    field width. If starting with 0 then the
#            output is zero padded
#        {arg}    argument such as header name etc
#
#    Format codes:
#
#        >a    Client source IP address
#        >A    Client FQDN
#        >p    Client source port
#        <A    Server IP address or peer name
#        la    Local IP address (http_port)
#        lp    Local port number (http_port)
#        ts    Seconds since epoch
#        tu    subsecond time (milliseconds)
#        tl    Local time. Optional strftime format argument
#            default %d/%b/%Y:%H:%M:%S %z
#        tg    GMT time. Optional strftime format argument
#            default %d/%b/%Y:%H:%M:%S %z
#        tr    Response time (milliseconds)
#        >h    Request header. Optional header name argument
#            on the format header[:[separator]element]
#        <h    Reply header. Optional header name argument
#            as for >h
#        un    User name
#        ul    User login
#        ui    User ident
#        us    User SSL
#        ue    User external acl
#        Hs    HTTP status code
#        Ss    Squid request status (TCP_MISS etc)
#        Sh    Squid hierarchy status (DEFAULT_PARENT etc)
#        mt    MIME content type
#        rm    Request method (GET/POST etc)
#        ru    Request URL
#        rv    Request protocol version
#        ea    Log string returned by external acl
#        <st    Reply size including HTTP headers
#        %    a literal % character
#
#logformat squid  %ts.%03tu %6tr %>a %Ss/%03Hs %<st %rm %ru %un %Sh/%<A %mt
#logformat squidmime  %ts.%03tu %6tr %>a %Ss/%03Hs %<st %rm %ru %un %Sh/%<A %mt [%>h] [%<h]
#logformat common %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %Hs %<st %Ss:%Sh
#logformat combined %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %Hs %<st "%{Referer}>h" "%{User-Agent}>h" %Ss:%Sh
#
#Default:
# none

#  TAG: access_log
#  These files log client request activities. Has a line every HTTP or
#  ICP request. The format is:
#  access_log <filepath> [<logformat name> [acl acl ...]]
#
#  Will log to the specified file using the specified format (which
#  must be defined in a logformat directive) those entries which match
#  ALL the acl's specified (which must be defined in acl clauses).
#  If no acl is specified, all requests will be logged to this file.

#  To disable logging of a request use the filepath "none", in which case
#  a logformat name should not be specified.
#
#  To log the request via syslog specify a filepath of "syslog"
access_log /var/log/squid/access.log squid

#  TAG: cache_log
#    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.
#
#Default:
# cache_log /var/log/squid/cache.log

#  TAG: cache_store_log
#    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.
#
#Default:
# cache_store_log /var/log/squid/store.log

#  TAG: cache_swap_log
#    Location for the cache "swap.state" file. 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 it will be replaced with a
#    a representation of the cache_dir name where each / is replaced
#    with '.'. This is needed to allow adding/removing cache_dir
#    lines when cache_swap_log is being used.
#
#    If have more than one 'cache_dir', and %s is not used in the name
#    these swap logs will have names such as:
#
#        cache_swap_log.00
#        cache_swap_log.01
#        cache_swap_log.02
#
#    The numbered extension (which is added automatically)
#    corresponds to the order of the 'cache_dir' lines in this
#    configuration file.  If you change the order of the 'cache_dir'
#    lines in this file, these log files will NOT correspond to
#    the correct 'cache_dir' entry (unless you manually rename
#    them).  We recommend you do NOT use this option.  It is
#    better to keep these log files in each 'cache_dir' directory.
#
#Default:
# none

#  TAG: emulate_httpd_log    on|off
#    The Cache can emulate the log file format which many 'httpd'
#    programs use.  To disable/enable this emulation, set
#    emulate_httpd_log to 'off' or 'on'.  The default
#    is to use the native log format since it includes useful
#    information Squid-specific log analyzers use.
#
#Default:
# emulate_httpd_log off

#  TAG: log_ip_on_direct    on|off
#    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.
#
#Default:
# log_ip_on_direct on

#  TAG: mime_table
#    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.
#
#Default:
# mime_table /etc/squid/mime.conf

#  TAG: log_mime_hdrs    on|off
#    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'.
#
#Default:
# log_mime_hdrs off

#  TAG: useragent_log
#    Squid will write the User-Agent field from HTTP requests
#    to the filename specified here.  By default useragent_log
#    is disabled.
#
#Default:
# none

#  TAG: referer_log
#    Squid will write the Referer field from HTTP requests to the
#    filename specified here.  By default referer_log is disabled.
#    Note that "referer" is actually a misspelling of "referrer"
#    however the misspelt version has been accepted into the HTTP RFCs
#    and we accept both.
#
#Default:
# none

#  TAG: pid_filename
#    A filename to write the process-id to.  To disable, enter "none".
#
#Default:
# pid_filename /var/run/squid.pid

#  TAG: debug_options
#    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".
#
#Default:
# debug_options ALL,1

#  TAG: log_fqdn    on|off
#    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.
#
#Default:
# log_fqdn off

#  TAG: client_netmask
#    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'.
#
#Default:
# client_netmask 255.255.255.255


# OPTIONS FOR EXTERNAL SUPPORT PROGRAMS
# -----------------------------------------------------------------------------

#  TAG: ftp_user
#    If you want the anonymous login password to be more informative
#    (and enable the use of picky ftp servers), set this to something
#    reasonable for your domain, like wwwuser@somewhere.net
#
#    The reason why this is domainless by default is the
#    request can be made on the behalf of a user in any domain,
#    depending on how the cache is used.
#    Some ftp server also validate the email address is valid
#    (for example perl.com).
#
#Default:
# ftp_user Squid@

#  TAG: ftp_list_width
#    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.
#
#Default:
# ftp_list_width 32

#  TAG: ftp_passive
#    If your firewall does not allow Squid to use passive
#    connections, turn off this option.
#
#Default:
# ftp_passive on

#  TAG: ftp_sanitycheck
#    For security and data integrity reasons Squid by default performs
#    sanity checks of the addresses of FTP data connections ensure the
#    data connection is to the requested server. If you need to allow
#    FTP connections to servers using another IP address for the data
#    connection turn this off.
#
#Default:
# ftp_sanitycheck on

#  TAG: ftp_telnet_protocol
#    The FTP protocol is officially defined to use the telnet protocol
#    as transport channel for the control connection. However, many
#    implementations are broken and does not respect this aspect of
#    the FTP protocol.
#
#    If you have trouble accessing files with ASCII code 255 in the
#    path or similar problems involving this ASCII code you can
#    try setting this directive to off. If that helps, report to the
#    operator of the FTP server in question that their FTP server
#    is broken and does not follow the FTP standard.
#
#Default:
# ftp_telnet_protocol on

#  TAG: check_hostnames
#    For security and stability reasons Squid by default checks
#    hostnames for Internet standard RFC compliance. If you do not want
#    Squid to perform these checks then turn this directive off.
#
#Default:
# check_hostnames on

#  TAG: allow_underscore
#    Underscore characters is not strictly allowed in Internet hostnames
#    but nevertheless used by many sites. Set this to off if you want
#    Squid to be strict about the standard.
#
#Default:
# allow_underscore on

#  TAG: cache_dns_program
# Note: This option is only available if Squid is rebuilt with the
#       --disable-internal-dns option
#
#    Specify the location of the executable for dnslookup process.
#
#Default:
# cache_dns_program /usr/lib/squid/dnsserver

#  TAG: dns_children
# Note: This option is only available if Squid is rebuilt with the
#       --disable-internal-dns option
#
#    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.
#
#Default:
# dns_children 5

#  TAG: dns_retransmit_interval
#    Initial retransmit interval for DNS queries. The interval is
#    doubled each time all configured DNS servers have been tried.
#
#
#Default:
# dns_retransmit_interval 5 seconds

#  TAG: dns_timeout
#    DNS Query timeout. If no response is received to a DNS query
#    within this time all DNS servers for the queried domain
#    are assumed to be unavailable.
#
#Default:
# dns_timeout 2 minutes

#  TAG: dns_defnames    on|off
#    Normally the RES_DEFNAMES resolver option is disabled
#    (see res_init(3)).  This prevents caches in a hierarchy
#    from interpreting single-component hostnames locally.  To allow
#    Squid to handle single-component names, enable this option.
#
#Default:
# dns_defnames off

#  TAG: dns_nameservers
#    Use this if you want to specify a list of DNS name servers
#    (IP addresses) to use instead of those given in your
#    /etc/resolv.conf file.
#    On Windows platforms, if no value is specified here or in
#    the /etc/resolv.conf file, the list of DNS name servers are
#    taken from the Windows registry, both static and dynamic DHCP
#    configurations are supported.
#
#    Example: dns_nameservers 10.0.0.1 192.172.0.4
#
#Default:
# none

#  TAG: hosts_file
#    Location of the host-local IP name-address associations
#    database. Most Operating Systems have such a file on different
#    default locations:
#    - Un*X & Linux:    /etc/hosts
#    - Windows NT/2000: %SystemRoot%\system32\drivers\etc\hosts
#               (%SystemRoot% value install default is c:\winnt)
#    - Windows XP/2003: %SystemRoot%\system32\drivers\etc\hosts
#               (%SystemRoot% value install default is c:\windows)
#    - Windows 9x/Me:   %windir%\hosts
#               (%windir% value is usually c:\windows)
#    - Cygwin:          /etc/hosts
#
#    The file contains newline-separated definitions, in the
#    form ip_address_in_dotted_form name [name ...] names are
#    whitespace-separated. Lines beginning with an hash (#)
#    character are comments.
#
#    The file is checked at startup and upon configuration.
#    If set to 'none', it won't be checked.
#    If append_domain is used, that domain will be added to
#    domain-local (i.e. not containing any dot character) host
#    definitions.
#
#Default:
# hosts_file /etc/hosts

#  TAG: diskd_program
#    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.
#
#Default:
# diskd_program /usr/lib/squid/diskd-daemon

#  TAG: unlinkd_program
#    Specify the location of the executable for file deletion process.
#
#Default:
# unlinkd_program /usr/lib/squid/unlinkd

#  TAG: pinger_program
# Note: This option is only available if Squid is rebuilt with the
#       --enable-icmp option
#
#    Specify the location of the executable for the pinger process.
#
#Default:
# pinger_program /usr/lib/squid/pinger

#  TAG: url_rewrite_program
#    Specify the location of the executable for the URL rewriter.
#    Since they can perform almost any function there isn't one included.
#
#    For each requested URL rewriter will receive on line with the format
#
#    URL <SP> client_ip "/" fqdn <SP> user <SP> method <SP> urlgroup <NL>
#
#    And the rewriter may return a rewritten URL. The other components of
#    the request line does not need to be returned (ignored if they are).
#
#    The rewriter can also indicate that a client-side redirect should
#    be performed to the new URL. This is done by prefixing the returned
#    URL with "301:" (moved permanently) or 302: (moved temporarily).
#   
#    It can also return a "urlgroup" that can subsequently be matched
#    in cache_peer_access and similar ACL driven rules. An urlgroup is
#    returned by prefixing the returned url with "!urlgroup!"
#
#    By default, a URL rewriter is not used.
#
#Default:
# none

#  TAG: url_rewrite_children
#    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.
#
#Default:
# url_rewrite_children 5

#  TAG: url_rewrite_concurrency
#    The number of requests each redirector helper can handle in
#    parallel. Defaults to 0 which indicates that the redirector
#    is a old-style singlethreaded redirector.
#
#Default:
# url_rewrite_concurrency 0

#  TAG: url_rewrite_host_header
#    By default Squid rewrites any Host: header in redirected
#    requests.  If you are running an accelerator this may
#    not be a wanted effect of a redirector.
#
#    WARNING: Entries are cached on the result of the URL rewriting
#    process, so be careful if you have domain-virtual hosts.
#
#Default:
# url_rewrite_host_header on

#  TAG: url_rewrite_access
#    If defined, this access list specifies which requests are
#    sent to the redirector processes.  By default all requests
#    are sent.
#
#Default:
# none

#  TAG: location_rewrite_program
#    Specify the location of the executable for the Location rewriter,
#    used to rewrite server generated redirects. Usually used in
#    conjunction with a url_rewrite_program
#
#    For each Location header received the location rewriter will receive
#    one line with the format:
#
#       location URL <SP> requested URL <SP> urlgroup <NL>
#
#    And the rewriter may return a rewritten Location URL or a blank line.
#    The other components of the request line does not need to be returned
#    (ignored if they are).
#
#    By default, a Location rewriter is not used.
#
#Default:
# none

#  TAG: location_rewrite_children
#    The number of location rewriting 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.
#
#Default:
# location_rewrite_children 5

#  TAG: location_rewrite_concurrency
#    The number of requests each Location rewriter helper can handle in
#    parallel. Defaults to 0 which indicates that the helper
#    is a old-style singlethreaded helper.
#
#Default:
# location_rewrite_concurrency 0

#  TAG: location_rewrite_access
#    If defined, this access list specifies which requests are
#    sent to the location rewriting processes.  By default all Location
#    headers are sent.
#
#Default:
# none

#  TAG: auth_param
#    This is used to define parameters for the various authentication
#    schemes supported by Squid.
#
#    format: auth_param scheme parameter [setting]
#
#    The order in which authentication schemes are presented to the client is
#    dependent on the order the scheme first appears in config file. IE
#    has a bug (it's not RFC 2617 compliant) in that it will use the basic
#    scheme if basic is the first entry presented, even if more secure
#    schemes are presented. For now use the order in the recommended
#    settings section below. If other browsers have difficulties (don't
#    recognize the schemes offered even if you are using basic) either
#    put basic first, or disable the other schemes (by commenting out their
#    program entry).
#
#    Once an authentication scheme is fully configured, it can only be
#    shutdown by shutting squid down and restarting. Changes can be made on
#    the fly and activated with a reconfigure. I.E. You can change to a
#    different helper, but not unconfigure the helper completely.
#
#    Please note that while this directive defines how Squid processes
#    authentication it does not automatically activate authentication.
#    To use authentication you must in addition make use of ACLs based
#    on login name in http_access (proxy_auth, proxy_auth_regex or
#    external with %LOGIN used in the format tag). The browser will be
#    challenged for authentication on the first such acl encountered
#    in http_access processing and will also be re-challenged for new
#    login credentials if the request is being denied by a proxy_auth
#    type acl.
#
#    WARNING: authentication can't be used in a transparently intercepting
#    proxy as the client then thinks it is talking to an origin server and
#    not the proxy. This is a limitation of bending the TCP/IP protocol to
#    transparently intercepting port 80, not a limitation in Squid.
#
#    === Parameters for the basic scheme follow. ===
#
#    "program" cmdline
#    Specify the command for the external authenticator.  Such a program
#    reads a line containing "username password" and replies "OK" or
#    "ERR" in an endless loop. "ERR" responses may optionally be followed
#    by a error description available as %m in the returned error page.
#
#    By default, the basic authentication scheme is not used unless a
#    program is specified.
#
#    If you want to use the traditional proxy authentication, jump over to
#    the helpers/basic_auth/NCSA directory and type:
#        % make
#        % make install
#
#    Then, set this line to something like
#
    auth_param basic program /usr/lib/squid/pam_auth

#
#    "children" numberofchildren
#    The number of authenticator processes to spawn. If you start too few
#    squid will have to wait for them to process a backlog of credential
#    verifications, slowing it down. When credential verifications are
#    done via a (slow) network you are likely to need lots of
#    authenticator processes.
#    auth_param basic children 5
#
#    "concurrency" numberofconcurrentrequests
#    The number of concurrent requests/channels the helper supports.
#    Changes the protocol used to include a channel number first on
#    the request/response line, allowing multiple requests to be sent
#    to the same helper in parallell without wating for the response.
#    Must not be set unless it's known the helper supports this.
#
#    "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).
#    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 susceptibility to replay attacks unless you are
#    using an one-time password system (such as SecureID). If you are using
#    such a system, you will be vulnerable to replay attacks unless you
#    also use the max_user_ip ACL in an http_access rule.
#    auth_param basic credentialsttl 2 hours
#
#    "casesensitive" on|off
#    Specifies if usernames are case sensitive. Most user databases are
#    case insensitive allowing the same username to be spelled using both
#    lower and upper case letters, but some are case sensitive. This
#    makes a big difference for user_max_ip ACL processing and similar.
#    auth_param basic casesensitive off
#
#    "blankpassword" on|off
#    Specifies if blank passwords should be supported. Defaults to off
#    as there is multiple authentication backends which handles blank
#    passwords as "guest" access.
#
#    === 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 or ERR if the user (or his H(A1)
#    hash) does not exists.  See RFC 2616 for the definition of H(A1).
#    "ERR" responses may optionally be followed by a error description
#    available as %m in the returned error page.
#
#    By default, the digest authentication scheme is not used unless a
#    program is specified.
#
#    If you want to use a digest authenticator, jump over to the
#    helpers/digest_auth/ 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 /usr/libexec/digest_auth_pw /usr/etc/digpass
#
#
#    "children" numberofchildren
#    The number of authenticator processes to spawn. If you start too few
#    squid will have to wait for them to process a backlog of credential
#    verifications, slowing it down. When credential verifications are
#    done via a (slow) network you are likely to need lots of
#    authenticator processes.
#    auth_param digest children 5
#
#    "concurrency" numberofconcurrentrequests
#    The number of concurrent requests/channels the helper supports.
#    Changes the protocol used to include a channel number first on
#    the request/response line, allowing multiple requests to be sent
#    to the same helper in parallell without wating for the response.
#    Must not be set unless it's known the helper supports this.
#
#    "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).
#    auth_param digest realm Squid proxy-caching web server
#
#    "nonce_garbage_interval" timeinterval
#    Specifies the interval that nonces that have been issued to clients are
#    checked for validity.
#    auth_param digest nonce_garbage_interval 5 minutes
#
#    "nonce_max_duration" timeinterval
#    Specifies the maximum length of time a given nonce will be valid for.
#    auth_param digest nonce_max_duration 30 minutes
#
#    "nonce_max_count" number
#    Specifies the maximum number of times a given nonce can be used.
#    auth_param digest nonce_max_count 50
#
#    "nonce_strictness" on|off
#    Determines if squid requires strict increment-by-1 behavior for nonce
#    counts, or just incrementing (off - for use when useragents generate
#    nonce counts that occasionally miss 1 (ie, 1,2,4,6)).
#    auth_param digest nonce_strictness off
#
#    "check_nonce_count" on|off
#    This directive if set to off can disable the nonce count check
#    completely to work around buggy digest qop implementations in certain
#    mainstream browser versions. Default on to check the nonce count to
#    protect from authentication replay attacks.
#    auth_param digest check_nonce_count on
#
#    "post_workaround" on|off
#    This is a workaround to certain buggy browsers who sends an incorrect
#    request digest in POST requests when reusing the same nonce as acquired
#    earlier in response to a GET request.
#    auth_param digest post_workaround off
#
#    === NTLM scheme options follow ===
#
#    "program" cmdline
#    Specify the command for the external NTLM authenticator. Such a
#    program participates in the NTLMSSP exchanges between Squid and the
#    client and reads commands according to the Squid NTLMSSP helper
#    protocol. See helpers/ntlm_auth/ for details. Recommended ntlm
#    authenticator is ntlm_auth from Samba-3.X, but a number of other
#    ntlm authenticators is available.
#
#    By default, the ntlm authentication scheme is not used unless a
#    program is specified.
#
#    auth_param ntlm program /path/to/samba/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp
#
#    "children" numberofchildren
#    The number of authenticator processes to spawn. If you start too few
#    squid will have to wait for them to process a backlog of credential
#    verifications, slowing it down. When credential verifications are
#    done via a (slow) network you are likely to need lots of
#    authenticator processes.
#    auth_param ntlm children 5
#
#    "keep_alive" on|off
#    This option enables the use of keep-alive on the initial
#    authentication request. It has been reported some versions of MSIE
#    have problems if this is enabled, but performance will be increased
#    if enabled.
#
#    auth_param ntlm keep_alive on
#
#    === Negotiate scheme options follow ===
#
#    "program" cmdline
#    Specify the command for the external Negotiate authenticator. Such a
#    program participates in the SPNEGO exchanges between Squid and the
#    client and reads commands according to the Squid ntlmssp helper
#    protocol. See helpers/ntlm_auth/ for details. Recommended SPNEGO
#    authenticator is ntlm_auth from Samba-4.X.
#
#    By default, the Negotiate authentication scheme is not used unless a
#    program is specified.
#
#    auth_param negotiate program /path/to/samba/bin/ntlm_auth --helper-protocol=gss-spnego
#
#    "children" numberofchildren
#    The number of authenticator processes to spawn. If you start too few
#    squid will have to wait for them to process a backlog of credential
#    verifications, slowing it down. When credential verifications are
#    done via a (slow) network you are likely to need lots of
#    authenticator processes.
#    auth_param negotiate children 5
#
#    "keep_alive" on|off
#    If you experience problems with PUT/POST requests when using the
#    Negotiate authentication scheme then you can try setting this to
#    off. This will cause Squid to forcibly close the connection on
#    the initial requests where the browser asks which schemes are
#    supported by the proxy.
#
#    auth_param negotiate keep_alive on
#
#Recommended minimum configuration per scheme:
#auth_param negotiate program <uncomment and complete this line to activate>
#auth_param negotiate children 5
#auth_param negotiate keep_alive on
#auth_param ntlm program <uncomment and complete this line to activate>
#auth_param ntlm children 5
#auth_param ntlm keep_alive on
#auth_param digest program <uncomment and complete this line>
#auth_param digest children 5
#auth_param digest realm Squid proxy-caching web server
#auth_param digest nonce_garbage_interval 5 minutes
#auth_param digest nonce_max_duration 30 minutes
#auth_param digest nonce_max_count 50
#auth_param basic program <uncomment and complete this line>
#auth_param basic children 5
#auth_param basic realm Squid proxy-caching web server
#auth_param basic credentialsttl 2 hours
#auth_param basic casesensitive off

#  TAG: authenticate_cache_garbage_interval
#    The time period between garbage collection across the username cache.
#    This is a tradeoff between memory utilization (long intervals - say
#    2 days) and CPU (short intervals - say 1 minute). Only change if you
#    have good reason to.
#
#Default:
# authenticate_cache_garbage_interval 1 hour

#  TAG: authenticate_ttl
#    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.
#
#Default:
# authenticate_ttl 1 hour

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

#  TAG: external_acl_type
#    This option defines external acl classes using a helper program to
#    look up the status
#
#      external_acl_type name [options] FORMAT.. /path/to/helper [helper arguments..]
#
#    Options:
#
#      ttl=n        TTL in seconds for cached results (defaults to 3600
#            for 1 hour)
#      negative_ttl=n
#            TTL for cached negative lookups (default same
#            as ttl)
#      children=n    number of processes spawn to service external acl
#            lookups of this type. (default 5).
#      concurrency=n    concurrency level per process. Only used with helpers
#              capable of processing more than one query at a time.
#            Note: see compatibility note below
#      cache=n    result cache size, 0 is unbounded (default)
#      grace=    Percentage remaining of TTL where a refresh of a
#            cached entry should be initiated without needing to
#            wait for a new reply. (default 0 for no grace period)
#      protocol=2.5  Compatibility mode for Squid-2.5 external acl helpers
#
#    FORMAT specifications
#
#      %LOGIN    Authenticated user login name
#      %IDENT    Ident user name
#      %SRC        Client IP
#      %SRCPORT    Client source port
#      %DST        Requested host
#      %PROTO    Requested protocol
#      %PORT        Requested port
#      %METHOD    Request method
#      %MYADDR    Squid interface address
#      %MYPORT    Squid http_port number
#      %PATH        Requested URL-path (including query-string if any)
#      %USER_CERT    SSL User certificate in PEM format
#      %USER_CERTCHAIN SSL User certificate chain in PEM format
#      %USER_CERT_xx    SSL User certificate subject attribute xx
#      %USER_CA_xx    SSL User certificate issuer attribute xx
#      %{Header}    HTTP request header
#      %{Hdr:member}    HTTP request header list member
#      %{Hdr:;member}
#            HTTP request header list member using ; as
#            list separator. ; can be any non-alphanumeric
#            character.
#     %ACL        The ACL name
#     %DATA        The ACL arguments. If not used then any arguments
#            is automatically added at the end
#
#    The request sent to the helper consists of the data in the format
#    specification in the order specified, plus any values specified in
#    the referencing acl (see the "acl external" directive).
#
#    The helper receives lines per the above format specification,
#    and returns lines starting with OK or ERR indicating the validity
#    of the request and optionally followed by additional keywords with
#    more details.
#
#    General result syntax:
#
#      OK/ERR keyword=value ...
#
#    Defined keywords:
#
#      user=        The users name (login also understood)
#      password=    The users password (for PROXYPASS login= cache_peer)
#      message=    Error message or similar used as %o in error messages
#            (error also understood)
#      log=        String to be logged in access.log. Available as
#            %ea in logformat specifications
#
#    If protocol=3.0 (the default) then URL escaping is used to protect
#    each value in both requests and responses.
#
#    If using protocol=2.5 then all values need to be enclosed in quotes
#    if they may contain whitespace, or the whitespace escaped using \.
#    And quotes or \ characters within the keyword value must be \ escaped.
#
#    When using the concurrency= option the protocol is changed by
#    introducing a query channel tag infront of the request/response.
#    The query channel tag is a number between 0 and concurrency-1.
#
#    Compatibility Note: The children= option was named concurrency= in
#    Squid-2.5.STABLE3 and earlier, and was accepted as an alias for the
#    duration of the Squid-2.5 releases to keep compatibility. However,
#    the meaning of concurrency= option has changed in Squid-2.6 to match
#    that of Squid-3 and the old syntax no longer works.
#
#Default:
# none


# OPTIONS FOR TUNING THE CACHE
# -----------------------------------------------------------------------------

#  TAG: wais_relay_host
#  TAG: wais_relay_port
#    Relay WAIS request to host (1st arg) at port (2 arg).
#
#Default:
# wais_relay_port 0

#  TAG: request_header_max_size    (KB)
#    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.
#
#Default:
# request_header_max_size 20 KB

#  TAG: request_body_max_size    (KB)
#    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.
#
#Default:
# request_body_max_size 0 KB

#  TAG: refresh_pattern
#    usage: refresh_pattern [-i] regex min percent max [options]
#
#    By default, regular expressions are CASE-SENSITIVE.  To make
#    them case-insensitive, use the -i option.
#
#    'Min' is the time (in minutes) an object without an explicit
#    expiry time should be considered fresh. The recommended
#    value is 0, any higher values may cause dynamic applications
#    to be erroneously cached unless the application designer
#    has taken the appropriate actions.
#
#    'Percent' is a percentage of the objects age (time since last
#    modification age) an object without explicit expiry time
#    will be considered fresh.
#
#    'Max' is an upper limit on how long objects without an explicit
#    expiry time will be considered fresh.
#
#    options: override-expire
#         override-lastmod
#         reload-into-ims
#         ignore-reload
#         ignore-no-cache
#         ignore-private
#         ignore-auth
#
#        override-expire enforces min age even if the server
#        sent a Expires: header. Doing this VIOLATES the HTTP
#        standard.  Enabling this feature could make you liable
#        for problems which it causes.
#
#        override-lastmod enforces min age even on objects
#        that were modified recently.
#
#        reload-into-ims changes client no-cache or ``reload''
#        to If-Modified-Since requests. Doing this VIOLATES the
#        HTTP standard. Enabling this feature could make you
#        liable for problems which it causes.
#
#        ignore-reload ignores a client no-cache or ``reload''
#        header. Doing this VIOLATES the HTTP standard. Enabling
#        this feature could make you liable for problems which
#        it causes.
#
#        ignore-no-cache ignores any ``Pragma: no-cache'' and
#        ``Cache-control: no-cache'' headers received from a server.
#        The HTTP RFC never allows the use of this (Pragma) header
#        from a server, only a client, though plenty of servers
#        send it anyway.
#       
#        ignore-private ignores any ``Cache-control: private''
#        headers received from a server. Doing this VIOLATES
#        the HTTP standard. Enabling this feature could make you
#        liable for problems which it causes.
#       
#        ignore-auth caches responses to requests with authorization,
#        irrespective of ``Cache-control'' headers received from
#        a server. Doing this VIOLATES the HTTP standard. Enabling
#        this feature could make you liable for problems which
#        it causes.
#       
#    Basically a cached object is:
#
#        FRESH if expires < now, else STALE
#        STALE if age > max
#        FRESH if lm-factor < percent, else STALE
#        FRESH if age < min
#        else STALE
#
#    The refresh_pattern lines are checked in the order listed here.
#    The first entry which matches is used.  If none of the entries
#    match the default will be used.
#
#    Note, you must uncomment all the default lines if you want
#    to change one. The default setting is only active if none is
#    used.
#
#Suggested default:
refresh_pattern ^ftp:        1440    20%    10080
refresh_pattern ^gopher:    1440    0%    1440
refresh_pattern .        0    20%    4320

#  TAG: quick_abort_min    (KB)
#  TAG: quick_abort_max    (KB)
#  TAG: quick_abort_pct    (percent)
#    The cache by default continues downloading aborted requests
#    which are almost completed (less than 16 KB remaining). This
#    may be undesirable on slow (e.g. SLIP) links and/or very busy
#    caches.  Impatient users may tie up file descriptors and
#    bandwidth by repeatedly requesting and immediately aborting
#    downloads.
#
#    When the user aborts a request, Squid will check the
#    quick_abort values to the amount of data transfered until
#    then.
#
#    If the transfer has less than 'quick_abort_min' KB remaining,
#    it will finish the retrieval.
#
#    If the transfer has more than 'quick_abort_max' KB remaining,
#    it will abort the retrieval.
#
#    If more than 'quick_abort_pct' of the transfer has completed,
#    it will finish the retrieval.
#
#    If you do not want any retrieval to continue after the client
#    has aborted, set both 'quick_abort_min' and 'quick_abort_max'
#    to '0 KB'.
#
#    If you want retrievals to always continue if they are being
#    cached set 'quick_abort_min' to '-1 KB'.
#
#Default:
# quick_abort_min 16 KB
# quick_abort_max 16 KB
# quick_abort_pct 95

#  TAG: read_ahead_gap    buffer-size
#    The amount of data the cache will buffer ahead of what has been
#    sent to the client when retrieving an object from another server.
#
#Default:
# read_ahead_gap 16 KB

#  TAG: negative_ttl    time-units
#    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.
#
#Default:
# negative_ttl 5 minutes

#  TAG: positive_dns_ttl    time-units
#    Upper limit on how long Squid will cache positive DNS responses.
#    Default is 6 hours (360 minutes). This directive must be set
#    larger than negative_dns_ttl.
#
#Default:
# positive_dns_ttl 6 hours

#  TAG: negative_dns_ttl    time-units
#    Time-to-Live (TTL) for negative caching of failed DNS lookups.
#    This also makes sets the lower cache limit on positive lookups.
#    Minimum value is 1 second, and it is not recommendable to go
#    much below 10 seconds.
#
#Default:
# negative_dns_ttl 1 minute

#  TAG: range_offset_limit    (bytes)
#    Sets a upper limit on how far into the the file a Range request
#    may be to cause Squid to prefetch the whole file. If beyond this
#    limit Squid forwards the Range request as it is and the result
#    is NOT cached.
#
#    This is to stop a far ahead range request (lets say start at 17MB)
#    from making Squid fetch the whole object up to that point before
#    sending anything to the client.
#
#    A value of -1 causes Squid to always fetch the object from the
#    beginning so it may cache the result. (2.0 style)
#
#    A value of 0 causes Squid to never fetch more than the
#    client requested. (default)
#
#Default:
# range_offset_limit 0 KB

#  TAG: collapsed_forwarding    (on|off)
#    This option enables multiple requests for the same URI to be
#    processed as one request. Normally disabled to avoid increased
#    latency on dynamic content, but there can be benefit from enabling
#    this in accelerator setups where the web servers are the bottleneck
#    and reliable and returns mostly cacheable information.
#
#Default:
# collapsed_forwarding off

#  TAG: refresh_stale_hit    (time)
#    This option changes the refresh algorithm to allow concurrent
#    requests while an object is being refreshed to be processed as
#    cache hits if the object expired less than X seconds ago. Default
#    is 0 to disable this feature. This option is mostly interesting
#    in accelerator setups where a few objects is accessed very
#    frequently.
#
#Default:
# refresh_stale_hit 0 seconds


# TIMEOUTS
# -----------------------------------------------------------------------------

#  TAG: forward_timeout    time-units
#    This parameter specifies how long Squid should at most attempt in
#    finding a forwarding path for the request before giving up.
#
#Default:
# forward_timeout 4 minutes

#  TAG: connect_timeout    time-units
#    This parameter specifies how long to wait for the TCP connect to
#    the requested server or peer to complete before Squid should
#    attempt to find another path where to forward the request.
#
#Default:
# connect_timeout 1 minute

#  TAG: peer_connect_timeout    time-units
#    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.
#
#Default:
# peer_connect_timeout 30 seconds

#  TAG: read_timeout    time-units
#    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.
#
#Default:
# read_timeout 15 minutes

#  TAG: request_timeout
#    How long to wait for an HTTP request after initial
#    connection establishment.
#
#Default:
# request_timeout 5 minutes

#  TAG: persistent_request_timeout
#    How long to wait for the next HTTP request on a persistent
#    connection after the previous request completes.
#
#Default:
# persistent_request_timeout 1 minute

#  TAG: client_lifetime    time-units
#    The maximum amount of time a client (browser) is allowed to
#    remain connected to the cache process.  This protects the Cache
#    from having a lot of sockets (and hence file descriptors) tied up
#    in a CLOSE_WAIT state from remote clients that go away without
#    properly shutting down (either because of a network failure or
#    because of a poor client implementation).  The default is one
#    day, 1440 minutes.
#
#    NOTE:  The default value is intended to be much larger than any
#    client would ever need to be connected to your cache.  You
#    should probably change client_lifetime only as a last resort.
#    If you seem to have many client connections tying up
#    filedescriptors, we recommend first tuning the read_timeout,
#    request_timeout, persistent_request_timeout and quick_abort values.
#
#Default:
# client_lifetime 1 day

#  TAG: half_closed_clients
#    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."
#
#Default:
# half_closed_clients on

#  TAG: pconn_timeout
#    Timeout for idle persistent connections to servers and other
#    proxies.
#
#Default:
# pconn_timeout 120 seconds

#  TAG: ident_timeout
#    Maximum time to wait for IDENT lookups to complete.
#
#    If this is too high, and you enabled IDENT lookups from untrusted
#    users, you might be susceptible to denial-of-service by having
#    many ident requests going at once.
#
#Default:
# ident_timeout 10 seconds

#  TAG: shutdown_lifetime    time-units
#    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.
#
#Default:
# shutdown_lifetime 30 seconds


# ACCESS CONTROLS
# -----------------------------------------------------------------------------

#  TAG: acl
#    Defining an Access List
#
#    acl aclname acltype string1 ...
#    acl aclname acltype "file" ...
#
#    when using "file", the file should contain one item per line
#
#    acltype is one of the types described below
#
#    By default, regular expressions are CASE-SENSITIVE.  To make
#    them case-insensitive, use the -i option.
#
#    acl aclname src      ip-address/netmask ... (clients IP address)
#    acl aclname src      addr1-addr2/netmask ... (range of addresses)
#    acl aclname dst      ip-address/netmask ... (URL host's IP address)
#    acl aclname myip     ip-address/netmask ... (local socket IP address)
#
#    acl aclname arp      mac-address ... (xx:xx:xx:xx:xx:xx notation)
#      # The arp ACL requires the special configure option --enable-arp-acl.
#      # Furthermore, the arp ACL code is not portable to all operating systems.
#      # It works on Linux, Solaris, FreeBSD and some other *BSD variants.
#      #
#      # NOTE: Squid can only determine the MAC address for clients that are on
#      # the same subnet. If the client is on a different subnet, then Squid cannot
#      # find out its MAC address.
#
#    acl aclname srcdomain   .foo.com ...    # reverse lookup, client IP
#    acl aclname dstdomain   .foo.com ...    # Destination server from URL
#    acl aclname srcdom_regex [-i] xxx ...   # regex matching client name
#    acl aclname dstdom_regex [-i] xxx ...   # regex matching server
#      # For dstdomain and dstdom_regex  a reverse lookup is tried if a IP
#      # based URL is used and no match is found. The name "none" is used
#      # if the reverse lookup fails.
#
#    acl aclname 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 urllogin [-i] [^a-zA-Z0-9] ...    # regex matching on URL login field
#    acl aclname port     80 70 21 ...
#    acl aclname port     0-1024 ...        # ranges allowed
#    acl aclname myport   3128 ...        # (local socket TCP port)
#    acl aclname proto    HTTP FTP ...
#    acl aclname method   GET POST ...
#    acl aclname browser  [-i] regexp ...
#      # pattern match on User-Agent header (see also req_header below)
#    acl aclname referer_regex  [-i] regexp ...
#      # pattern match on Referer header
#      # Referer is highly unreliable, so use with care
#    acl aclname ident    username ...
#    acl aclname ident_regex [-i] pattern ...
#      # string match on ident output.
#      # use REQUIRED to accept any non-null ident.
#    acl aclname src_as   number ...
#    acl aclname dst_as   number ...
#      # Except for access control, AS numbers can be used for
#      # routing of requests to specific caches. Here's an
#      # example for routing all requests for AS#1241 and only
#      # those to mycache.mydomain.net:
#      # acl asexample dst_as 1241
#      # cache_peer_access mycache.mydomain.net allow asexample
#      # cache_peer_access mycache_mydomain.net deny all
#
#    acl aclname proxy_auth [-i] username ...
#    acl aclname proxy_auth_regex [-i] pattern ...
#      # list of valid usernames
#      # use REQUIRED to accept any valid username.
#      #
#      # NOTE: when a Proxy-Authentication header is sent but it is not
#      # needed during ACL checking the username is NOT logged
#      # in access.log.
#      #
#      # NOTE: proxy_auth requires a EXTERNAL authentication program
#      # to check username/password combinations (see
#      # auth_param directive).
#      #
#      # 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 addresses. The authenticate_ip_ttl
#      # parameter controls the timeout on the ip entries.
#      # If -s is specified the limit is strict, denying browsing
#      # from any further IP addresses until the ttl has expired. Without
#      # -s Squid will just annoy the user by "randomly" denying requests.
#      # (the counter is reset each time the limit is reached and a
#      # request is denied)
#      # NOTE: in acceleration mode or where there is mesh of child proxies,
#      # clients may appear to come from multiple addresses if they are
#      # going through proxy farms, so a limit of 1 may cause user problems.
#
#    acl aclname req_mime_type mime-type1 ...
#      # regex match against the mime type of the request generated
#      # by the client. Can be used to detect file upload or some
#      # types HTTP tunneling requests.
#      # NOTE: This does NOT match the reply. You cannot use this
#      # to match the returned file type.
#
#    acl aclname req_header header-name [-i] any\.regex\.here
#      # regex match against any of the known request headers.  May be
#      # thought of as a superset of "browser", "referer" and "mime-type"
#      # ACLs.
#
#    acl aclname rep_mime_type mime-type1 ...
#      # regex match against the mime type of the reply received by
#      # squid. Can be used to detect file download or some
#      # types HTTP tunneling requests.
#      # NOTE: This has no effect in http_access rules. It only has
#      # effect in rules that affect the reply data stream such as
#      # http_reply_access.
#
#    acl aclname rep_header header-name [-i] any\.regex\.here
#      # regex match against any of the known response headers.
#      # Example:
#      #
#      # acl many_spaces rep_header Content-Disposition -i [[:space:]]{3,}
#
#    acl acl_name external class_name [arguments...]
#      # external ACL lookup via a helper class defined by the
#      # external_acl_type directive.
#
#    acl urlgroup group1 ...
#      # match against the urlgroup as indicated by redirectors
#
#    acl aclname user_cert attribute values...
#      # match against attributes in a user SSL certificate
#      # attribute is one of DN/C/O/CN/L/ST
#
#    acl aclname ca_cert attribute values...
#      # match against attributes a users issuing CA SSL certificate
#      # attribute is one of DN/C/O/CN/L/ST
#
#    acl aclname ext_user       username ...
#    acl aclname ext_user_regex [-i] pattern ...
#      # string match on username returned by external acl
#      # use REQUIRED to accept any user name.
#Examples:
#acl macaddress arp 09:00:2b:23:45:67
#acl myexample dst_as 1241
#acl password proxy_auth REQUIRED
#acl fileupload req_mime_type -i ^multipart/form-data$
#acl javascript rep_mime_type -i ^application/x-javascript$
#
#Recommended minimum configuration:
acl all src 0.0.0.0/0.0.0.0
acl manager proto cache_object
acl localhost src 127.0.0.1/255.255.255.255
acl to_localhost dst 127.0.0.0/8
acl SSL_ports port 443
acl Safe_ports port 80        # http
acl Safe_ports port 21        # ftp
acl Safe_ports port 443        # https
acl Safe_ports port 70        # gopher
acl Safe_ports port 210        # wais
acl Safe_ports port 1025-65535    # unregistered ports
acl Safe_ports port 280        # http-mgmt
acl Safe_ports port 488        # gss-http
acl Safe_ports port 591        # filemaker
acl Safe_ports port 777        # multiling http
acl CONNECT method CONNECT

# 1.acl allowip  src 192.168.0.65                      //Single ip
# 2.acl allownw  src 192.168.0.0/24                   //Full n/w
# 3.acl  allowedhours time M T W T F   9:00-17:00    //During this time
# 4.acl allowedsites srcdomain .matrix.com          //Deny a website
# 5.acl  safeport  port 443                        //Allow only thru this site
# 6.acl password proxy_auth REQUIRED              //Authenticate proxy


#  TAG: follow_x_forwarded_for
#    Allowing or Denying the X-Forwarded-For header to be followed to
#    find the original source of a request.
#
#    Requests may pass through a chain of several other proxies
#    before reaching us.  The X-Forwarded-For header will contain a
#    comma-separated list of the IP addresses in the chain, with the
#    rightmost address being the most recent.
#
#    If a request reaches us from a source that is allowed by this
#    configuration item, then we consult the X-Forwarded-For header
#    to see where that host received the request from.  If the
#    X-Forwarded-For header contains multiple addresses, and if
#    acl_uses_indirect_client is on, then we continue backtracking
#    until we reach an address for which we are not allowed to
#    follow the X-Forwarded-For header, or until we reach the first
#    address in the list.  (If acl_uses_indirect_client is off, then
#    it's impossible to backtrack through more than one level of
#    X-Forwarded-For addresses.)
#
#    The end result of this process is an IP address that we will
#    refer to as the indirect client address.  This address may
#    be treated as the client address for access control, delay
#    pools and logging, depending on the acl_uses_indirect_client,
#    delay_pool_uses_indirect_client and log_uses_indirect_client
#    options.
#
#    SECURITY CONSIDERATIONS:
#
#        Any host for which we follow the X-Forwarded-For header
#        can place incorrect information in the header, and Squid
#        will use the incorrect information as if it were the
#        source address of the request.  This may enable remote
#        hosts to bypass any access control restrictions that are
#        based on the client's source addresses.
#
#    For example:
#
#        acl localhost src 127.0.0.1
#        acl my_other_proxy srcdomain .proxy.example.com
#        follow_x_forwarded_for allow localhost
#        follow_x_forwarded_for allow my_other_proxy
#
#Default:
# follow_x_forwarded_for deny all

#  TAG: acl_uses_indirect_client    on|off
#    Controls whether the indirect client address
#    (see follow_x_forwarded_for) is used instead of the
#    direct client address in acl matching.
#
#Default:
# acl_uses_indirect_client on

#  TAG: delay_pool_uses_indirect_client    on|off
#    Controls whether the indirect client address
#    (see follow_x_forwarded_for) is used instead of the
#    direct client address in delay pools.
#
#Default:
# delay_pool_uses_indirect_client on

#  TAG: log_uses_indirect_client    on|off
#    Controls whether the indirect client address
#    (see follow_x_forwarded_for) is used instead of the
#    direct client address in the access log.
#
#Default:
# log_uses_indirect_client on

#  TAG: http_access
#    Allowing or Denying access based on defined access lists
#
#    Access to the HTTP port:
#    http_access allow|deny [!]aclname ...
#
#    NOTE on default values:
#
#    If there are no "access" lines present, the default is to deny
#    the request.
#
#    If none of the "access" lines cause a match, the default is the
#    opposite of the last line in the list.  If the last line was
#    deny, the default is allow.  Conversely, if the last line
#    is allow, the default will be deny.  For these reasons, it is a
#    good idea to have an "deny all" or "allow all" entry at the end
#    of your access lists to avoid potential confusion.
#
#Default:
# http_access deny all
#
#Recommended minimum configuration:
#
# Only allow cachemgr access from localhost
http_access allow manager localhost
http_access deny manager
# Deny requests to unknown ports
http_access deny !Safe_ports
# Deny CONNECT to other than SSL ports
http_access deny CONNECT !SSL_ports
#
# We strongly recommend the following be uncommented to protect innocent
# web applications running on the proxy server who think the only
# one who can access services on "localhost" is a local user
#http_access deny to_localhost
#
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS

# Example rule allowing access from your local networks. Adapt
# to list your (internal) IP networks from where browsing should
# be allowed
#acl our_networks src 192.168.1.0/24 192.168.2.0/24
#http_access allow our_networks

# And finally deny all other access to this proxy
# http_access allow allowip             //Allow Single ip
# http_access deny allownw             //Deny  Full n/w
# http_access allow  allowedhours     //Allow only during this time
# http_access deny allowedsites      // Deny Particular websites
# http_access allow  safeport       //Allow through this port
# http_access  allow password      //To authenticate  password
http_access allow  all
http_access deny  all



#  TAG: http_access2
#    Allowing or Denying access based on defined access lists
#
#    Identical to http_access, but runs after redirectors. If not set
#    then only http_access is used.
#
#Default:
# none

#  TAG: http_reply_access
#    Allow replies to client requests. This is complementary to http_access.
#
#    http_reply_access allow|deny [!] aclname ...
#
#    NOTE: if there are no access lines present, the default is to allow
#    all replies
#
#    If none of the access lines cause a match the opposite of the
#    last line will apply. Thus it is good practice to end the rules
#    with an "allow all" or "deny all" entry.
#
#Default:
# http_reply_access allow all
#
#Recommended minimum configuration:
#
# Insert your own rules here.
#
#
# and finally allow by default
http_reply_access allow all

#  TAG: icp_access
#    Allowing or Denying access to the ICP port based on defined
#    access lists
#
#    icp_access  allow|deny [!]aclname ...
#
#    See http_access for details
#
#Default:
# icp_access deny all
#
#Allow ICP queries from everyone
icp_access allow all

#  TAG: htcp_access
# Note: This option is only available if Squid is rebuilt with the
#       --enable-htcp option
#
#    Allowing or Denying access to the HTCP port based on defined
#    access lists
#
#    htcp_access  allow|deny [!]aclname ...
#
#    See http_access for details
#
##Allow HTCP queries from everyone
#htcp_access allow all
#
#Default:
# htcp_access deny all

#  TAG: htcp_clr_access
# Note: This option is only available if Squid is rebuilt with the
#       --enable-htcp option
#
#    Allowing or Denying access to purge content using HTCP based
#    on defined access lists
#
#    htcp_clr_access  allow|deny [!]aclname ...
#
#    See http_access for details
#
##Allow HTCP CLR requests from trusted peers
#acl htcp_clr_peer src 172.16.1.2
#htcp_clr_access allow htcp_clr_peer
#
#Default:
# htcp_clr_access deny all

#  TAG: miss_access
#    Use to force your neighbors to use you as a sibling instead of
#    a parent.  For example:
#
#        acl localclients src 172.16.0.0/16
#        miss_access allow localclients
#        miss_access deny  !localclients
#
#    This means only your local clients are allowed to fetch
#    MISSES and all other clients can only fetch HITS.
#
#    By default, allow all clients who passed the http_access rules
#    to fetch MISSES from us.
#
#Default setting:
# miss_access allow all

#  TAG: cache_peer_access
#    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).
#
#Default:
# none

#  TAG: ident_lookup_access
#    A list of ACL elements which, if matched, cause an ident
#    (RFC931) 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.
#
#Default:
# ident_lookup_access deny all

#  TAG: tcp_outgoing_tos
#    Allows you to select a TOS/Diffserv value to mark outgoing
#    connections with, based on the username or source address
#    making the request.
#
#    tcp_outgoing_tos ds-field [!]aclname ...
#
#    Example where normal_service_net uses the TOS value 0x00
#    and normal_service_net uses 0x20
#
#    acl normal_service_net src 10.0.0.0/255.255.255.0
#    acl good_service_net src 10.0.1.0/255.255.255.0
#    tcp_outgoing_tos 0x00 normal_service_net 0x00
#    tcp_outgoing_tos 0x20 good_service_net
#
#    TOS/DSCP values really only have local significance - so you should
#    know what you're specifying. For more information, see RFC2474 and
#    RFC3260.
#
#    The TOS/DSCP byte must be exactly that - a octet value  0 - 255, or
#    "default" to use whatever default your host has. Note that in
#    practice often only values 0 - 63 is usable as the two highest bits
#    have been redefined for use by ECN (RFC3168).
#
#    Processing proceeds in the order specified, and stops at first fully
#    matching line.
#
#    Note: The use of this directive using client dependent ACLs is
#    incompatible with the use of server side persistent connections. To
#    ensure correct results it is best to set server_persisten_connections
#    to off when using this directive in such configurations.
#
#Default:
# none

#  TAG: tcp_outgoing_address
#    Allows you to map requests to different outgoing IP addresses
#    based on the username or source address of the user making
#    the request.
#
#    tcp_outgoing_address ipaddr [[!]aclname] ...
#
#    Example where requests from 10.0.0.0/24 will be forwarded
#    with source address 10.1.0.1, 10.0.2.0/24 forwarded with
#    source address 10.1.0.2 and the rest will be forwarded with
#    source address 10.1.0.3.
#
#    acl normal_service_net src 10.0.0.0/255.255.255.0
#    acl good_service_net src 10.0.1.0/255.255.255.0
#    tcp_outgoing_address 10.0.0.1 normal_service_net
#    tcp_outgoing_address 10.0.0.2 good_service_net
#    tcp_outgoing_address 10.0.0.3
#
#    Processing proceeds in the order specified, and stops at first fully
#    matching line.
#
#    Note: The use of this directive using client dependent ACLs is
#    incompatible with the use of server side persistent connections. To
#    ensure correct results it is best to set server_persistent_connections
#    to off when using this directive in such configurations.
#
#Default:
# none

#  TAG: reply_header_max_size    (KB)
#    This specifies the maximum size for HTTP headers in a reply.
#    Reply headers are usually relatively small (about 512 bytes).
#    Placing a limit on the reply header size will catch certain
#    bugs (for example with persistent connections) and possibly
#    buffer-overflow or denial-of-service attacks.
#
#Default:
# reply_header_max_size 20 KB

#  TAG: reply_body_max_size    bytes allow|deny acl acl...
#    This option specifies the maximum size of a reply body in bytes.
#    It can be used to prevent users from downloading very large files,
#    such as MP3's and movies. When the reply headers are received,
#    the reply_body_max_size lines are processed, and the first line with
#    a result of "allow" is used as the maximum body size for this reply.
#    This size is checked twice. First when we get the reply headers,
#    we check the content-length value.  If the content length value exists
#    and is larger than the allowed size, the request is denied and the
#    user receives an error message that says "the request or reply
#    is too large." If there is no content-length, and the reply
#    size exceeds this limit, the client's connection is just closed
#    and they will receive a partial reply.
#
#    WARNING: downstream caches probably can not detect a partial reply
#    if there is no content-length header, so they will cache
#    partial responses and give them out as hits.  You should NOT
#    use this option if you have downstream caches.
#
#    If you set this parameter to zero (the default), there will be
#    no limit imposed.
#
#Default:
# reply_body_max_size 0 allow all

#  TAG: log_access    allow|deny acl acl...
#    This options allows you to control which requests gets logged
#    to access.log (see access_log directive). Requests denied for
#    logging will also not be accounted for in performance counters.
#
#Default:
# none


# ADMINISTRATIVE PARAMETERS
# -----------------------------------------------------------------------------

#  TAG: cache_mgr
#    Email-address of local cache manager who will receive
#    mail if the cache dies. The default is "root".
#
#Default:
# cache_mgr root

#  TAG: mail_from
#    From: email-address for mail sent when the cache dies.
#    The default is to use 'appname@unique_hostname'.
#    Default appname value is "squid", can be changed into
#    src/globals.h before building squid.
#
#Default:
# none

#  TAG: mail_program
#    Email program used to send mail if the cache dies.
#    The default is "mail". The specified program must complain
#    with the standard Unix mail syntax:
#    mail_program recipient < mailfile
#    Optional command line options can be specified.
#
#Default:
# mail_program mail

#  TAG: cache_effective_user
#    If you start Squid as root, it will change its effective/real
#    UID/GID to the user specified below.  The default is to change
#    to UID to "squid".  If you define cache_effective_user, but not
#    cache_effective_group, Squid sets the GID to the effective
#    user's default group ID (taken from the password file) and
#    supplementary group list from the from groups membership of
#    cache_effective_user.
#cache_effective_user squid
#
#Default:
# cache_effective_user squid

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

#  TAG: httpd_suppress_version_string    on|off
#    Suppress Squid version string info in HTTP headers and HTML error pages.
#
#Default:
# httpd_suppress_version_string off

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

#  TAG: unique_hostname
#    If you want to have multiple machines with the same
#    'visible_hostname' you must give each machine a different
#    'unique_hostname' so forwarding loops can be detected.
#
#Default:
# none

#  TAG: hostname_aliases
#    A list of other DNS names your cache has.
#
#Default:
# none

#  TAG: umask
#    Minimum umask which should be enforced while the proxy
#    is running, in addition to the umask set at startup.
#
#    Note: Should start with a 0 to indicate the normal octal
#    representation of umasks
#
#Default:
# umask 027


# 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/.

#  TAG: announce_period
#    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.
#
#Default:
# announce_period 0
#
#To enable announcing your cache, just uncomment the line below.
#announce_period 1 day

#  TAG: announce_host
#  TAG: announce_file
#  TAG: announce_port
#    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.
#
#Default:
# announce_host tracker.ircache.net
# announce_port 3131


# HTTPD-ACCELERATOR OPTIONS
# -----------------------------------------------------------------------------

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


# MISCELLANEOUS
# -----------------------------------------------------------------------------

#  TAG: dns_testnames
#    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.
#
#Default:
# dns_testnames netscape.com internic.net nlanr.net microsoft.com

#  TAG: logfile_rotate
#    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>'.
#   
#logfile_rotate 0
#
#Default:
# logfile_rotate 0

#  TAG: append_domain
#    Appends local domain name to hostnames without any dots in
#    them.  append_domain must begin with a period.
#
#    Be warned there are now Internet names with no dots in
#    them using only top-domain names, so setting this may
#    cause some Internet sites to become unavailable.
#
#Example:
# append_domain .yourdomain.com
#
#Default:
# none

#  TAG: tcp_recv_bufsize    (bytes)
#    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.
#
#Default:
# tcp_recv_bufsize 0 bytes

#  TAG: error_map
#    Map errors to custom messages
#
#        error_map message_url http_status ...
#
#    http_status ... is a list of HTTP status codes or Squid error
#    messages.
#
#    Use in accelerators to substitute the error messages returned
#    by servers with other custom errors.
#
#        error_map http://your.server/error/404.shtml 404
#   
#    Requests for error messages is a GET request for the configured
#    URL with the following special headers
#
#        X-Error-Status:    The received HTTP status code (i.e. 404)
#        X-Request-URI:    The requested URI where the error occurred
#   
#    In Addition the following headers are forwarded from the client
#    request:
#       
#        User-Agent, Cookie, X-Forwarded-For, Via, Authorization,
#        Accept, Referer
#   
#    And the following headers from the server reply:
#
#        Server, Via, Location, Content-Location
#   
#    The reply returned to the client will carry the original HTTP
#    headers from the real error message, but with the reply body
#    of the configured error message.
#
#
#Default:
# none

#  TAG: err_html_text
#    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.
#
#Default:
# none

#  TAG: deny_info
#    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 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
#    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.
#
#Default:
# none

#  TAG: memory_pools    on|off
#    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.
#
#Default:
# memory_pools on

#  TAG: memory_pools_limit    (bytes)
#    Used only with memory_pools on:
#    memory_pools_limit 50 MB
#
#    If set to a non-zero value, Squid will keep at most the specified
#    limit of allocated (but unused) memory in memory pools. All free()
#    requests that exceed this limit will be handled by your malloc
#    library. Squid does not pre-allocate any memory, just safe-keeps
#    objects that otherwise would be free()d. Thus, it is safe to set
#    memory_pools_limit to a reasonably high value even if your
#    configuration will use less memory.
#
#    If set to zero, Squid will keep all memory it can. That is, there
#    will be no limit on the total amount of memory used for safe-keeping.
#
#    To disable memory allocation optimization, do not set
#    memory_pools_limit to 0. Set memory_pools to "off" instead.
#
#    An overhead for maintaining memory pools is not taken into account
#    when the limit is checked. This overhead is close to four bytes per
#    object kept. However, pools may actually _save_ memory because of
#    reduced memory thrashing in your malloc library.
#
#Default:
# memory_pools_limit 5 MB

#  TAG: via    on|off
#    If set (default), Squid will include a Via header in requests and
#    replies.
#
#Default:
# via on

#  TAG: forwarded_for    on|off
#    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
#
#Default:
# forwarded_for on

#  TAG: log_icp_queries    on|off
#    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.
#
#Default:
# log_icp_queries on

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

#  TAG: minimum_direct_hops
#    If using the ICMP pinging stuff, do direct fetches for sites
#    which are no more than this many hops away.
#
#Default:
# minimum_direct_hops 4

#  TAG: minimum_direct_rtt
#    If using the ICMP pinging stuff, do direct fetches for sites
#    which are no more than this many rtt milliseconds away.
#
#Default:
# minimum_direct_rtt 400

#  TAG: cachemgr_passwd
#    Specify passwords for cachemgr operations.
#
#    Usage: cachemgr_passwd password action action ...
#
#    Some valid actions are (see cache manager menu for a full list):
#        5min
#        60min
#        asndb
#        authenticator
#        cbdata
#        client_list
#        comm_incoming
#        config *
#        counters
#        delay
#        digest_stats
#        dns
#        events
#        filedescriptors
#        fqdncache
#        histograms
#        http_headers
#        info
#        io
#        ipcache
#        mem
#        menu
#        netdb
#        non_peers
#        objects
#        offline_toggle *
#        pconn
#        peer_select
#        redirector
#        refresh
#        server_list
#        shutdown *
#        store_digest
#        storedir
#        utilization
#        via_headers
#        vm_objects
#
#    * Indicates actions which will not be performed without a
#      valid password, others can be performed if not listed here.
#
#    To disable an action, set the password to "disable".
#    To allow performing an action without a password, set the
#    password to "none".
#
#    Use the keyword "all" to set the same password for all actions.
#
#Example:
# cachemgr_passwd secret shutdown
# cachemgr_passwd lesssssssecret info stats/objects
# cachemgr_passwd disable all
#
#Default:
# none

#  TAG: store_avg_object_size    (kbytes)
#    Average object size, used to estimate number of objects your
#    cache can hold.  The default is 13 KB.
#
#Default:
# store_avg_object_size 13 KB

#  TAG: store_objects_per_bucket
#    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.
#
#Default:
# store_objects_per_bucket 20

#  TAG: client_db    on|off
#    If you want to disable collecting per-client statistics,
#    turn off client_db here.
#
#Default:
# client_db on

#  TAG: netdb_low
#  TAG: netdb_high
#    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.
#
#Default:
# netdb_low 900
# netdb_high 1000

#  TAG: netdb_ping_period
#    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.
#
#Default:
# netdb_ping_period 5 minutes

#  TAG: query_icmp    on|off
#    If you want to ask your peers to include ICMP data in their ICP
#    replies, enable this option.
#
#    If your peer has configured Squid (during compilation) with
#    '--enable-icmp' that peer will send ICMP pings to origin server
#    sites of the URLs it receives.  If you enable this option the
#    ICP replies from that peer will include the ICMP data (if available).
#    Then, when choosing a parent cache, Squid will choose the parent with
#    the minimal RTT to the origin server.  When this happens, the
#    hierarchy field of the access.log will be
#    "CLOSEST_PARENT_MISS".  This option is off by default.
#
#Default:
# query_icmp off

#  TAG: test_reachability    on|off
#    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.
#
#Default:
# test_reachability off

#  TAG: buffered_logs    on|off
#    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..).
#
#Default:
# buffered_logs off

#  TAG: reload_into_ims    on|off
#    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.
#
#Default:
# reload_into_ims off

#  TAG: always_direct
#    Usage: always_direct allow|deny [!]aclname ...
#
#    Here you can use ACL elements to specify requests which should
#    ALWAYS be forwarded by Squid to the origin servers without using
#    any peers.  For example, to always directly forward requests for
#    local servers ignoring any parents or siblings you may have use
#    something like:
#
#        acl local-servers dstdomain my.domain.net
#        always_direct allow local-servers
#
#    To always forward FTP requests directly, use
#
#        acl FTP proto FTP
#        always_direct allow FTP
#
#    NOTE: There is a similar, but opposite option named
#    'never_direct'.  You need to be aware that "always_direct deny
#    foo" is NOT the same thing as "never_direct allow foo".  You
#    may need to use a deny rule to exclude a more-specific case of
#    some other rule.  Example:
#
#        acl local-external dstdomain external.foo.net
#        acl local-servers dstdomain  .foo.net
#        always_direct deny local-external
#        always_direct allow local-servers
#
#    NOTE: If your goal is to make the client forward the request
#    directly to the origin server bypassing Squid then this needs
#    to be done in the client configuration. Squid configuration
#    can only tell Squid how Squid should fetch the object.
#
#    NOTE: This directive is not related to caching. The replies
#    is cached as usual even if you use always_direct. To not cache
#    the replies see no_cache.
#
#    This option replaces some v1.1 options such as local_domain
#    and local_ip.
#
#Default:
# none

#  TAG: never_direct
#    Usage: never_direct allow|deny [!]aclname ...
#
#    never_direct is the opposite of always_direct.  Please read
#    the description for always_direct if you have not already.
#
#    With 'never_direct' you can use ACL elements to specify
#    requests which should NEVER be forwarded directly to origin
#    servers.  For example, to force the use of a proxy for all
#    requests, except those in your local domain use something like:
#
#        acl local-servers dstdomain .foo.net
#        acl all src 0.0.0.0/0.0.0.0
#        never_direct deny local-servers
#        never_direct allow all
#
#    or if Squid is inside a firewall and there are local intranet
#    servers inside the firewall use something like:
#
#        acl local-intranet dstdomain .foo.net
#        acl local-external dstdomain external.foo.net
#        always_direct deny local-external
#        always_direct allow local-intranet
#        never_direct allow all
#
#    This option replaces some v1.1 options such as inside_firewall
#    and firewall_ip.
#
#Default:
# none

#  TAG: header_access
#    Usage: header_access header_name allow|deny [!]aclname ...
#
#    WARNING: Doing this VIOLATES the HTTP standard.  Enabling
#    this feature could make you liable for problems which it
#    causes.
#
#    This option replaces the old 'anonymize_headers' and the
#    older 'http_anonymizer' option with something that is much
#    more configurable. This new method creates a list of ACLs
#    for each header, allowing you very fine-tuned header
#    mangling.
#
#    You can only specify known headers for the header name.
#    Other headers are reclassified as 'Other'. You can also
#    refer to all the headers with 'All'.
#
#    For example, to achieve the same behavior as the old
#    'http_anonymizer standard' option, you should use:
#
#        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 WWW-Authenticate allow all
#        header_access Proxy-Authorization allow all
#        header_access Proxy-Authenticate 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 Accept-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).
#
#Default:
# none

#  TAG: header_replace
#    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.
#
#Default:
# none

#  TAG: icon_directory
#    Where the icons are stored. These are normally kept in
#    /usr/share/squid/icons
#
#Default:
# icon_directory /usr/share/squid/icons

#  TAG: global_internal_static
#    This directive controls is Squid should intercept all requests for
#    /squid-internal-static/ no matter which host the URL is requesting
#    (default on setting), or if nothing special should be done for
#    such URLs (off setting). The purpose of this directive is to make
#    icons etc work better in complex cache hierarchies where it may
#    not always be possible for all corners in the cache mesh to reach
#    the server generating a directory listing.
#
#Default:
# global_internal_static on

#  TAG: short_icon_urls
#    If this is enabled Squid will use short URLs for icons.
#
#    If off the URLs for icons will always be absolute URLs
#    including the proxy name and port.
#
#Default:
# short_icon_urls off

#  TAG: error_directory
#    Directory where the error files are read from.
#    /usr/lib/squid/errors contains sets of error files
#    in different languages. The default error directory
#    is /etc/squid/errors, which is a link to one of these
#    error sets.
#
#    If you wish to create your own versions of the 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.
#   
#error_directory /usr/share/squid/errors/English
#
#Default:
# error_directory /usr/share/squid/errors/English

#  TAG: maximum_single_addr_tries
#    This sets the maximum number of connection attempts for a
#    host that only has one address (for multiple-address hosts,
#    each address is tried once).
#
#    The default value is one attempt, the (not recommended)
#    maximum is 255 tries.  A warning message will be generated
#    if it is set to a value greater than ten.
#
#    Note: This is in addition to the request re-forwarding which
#    takes place if Squid fails to get a satisfying response.
#
#Default:
# maximum_single_addr_tries 1

#  TAG: retry_on_error
#    If set to on Squid will automatically retry requests when
#    receiving an error response. This is mainly useful if you
#    are in a complex cache hierarchy to work around access
#    control errors.
#
#Default:
# retry_on_error off

#  TAG: snmp_port
#    Squid can now serve statistics and status information via SNMP.
#    A value of "0" disables SNMP support. If you wish to use SNMP,
#    set this to "3401" to use the normal SNMP support.
#
#Default:
# snmp_port 0

#  TAG: snmp_access
#    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
#
#Default:
# snmp_access deny all

#  TAG: snmp_incoming_address
#  TAG: snmp_outgoing_address
#    Just like 'udp_incoming_address' above, but for the SNMP port.
#
#    snmp_incoming_address    is used for the SNMP socket receiving
#                messages from SNMP agents.
#    snmp_outgoing_address    is used for SNMP packets returned to SNMP
#                agents.
#
#    The default snmp_incoming_address (0.0.0.0) is to listen on all
#    available network interfaces.
#
#    If snmp_outgoing_address is set to 255.255.255.255 (the default)
#    it will use the same socket as snmp_incoming_address. Only
#    change this if you want to have SNMP replies sent using another
#    address than where this Squid listens for SNMP queries.
#
#    NOTE, snmp_incoming_address and snmp_outgoing_address can not have
#    the same value since they both use port 3401.
#
#Default:
# snmp_incoming_address 0.0.0.0
# snmp_outgoing_address 255.255.255.255

#  TAG: as_whois_server
#    WHOIS server to query for AS numbers.  NOTE: AS numbers are
#    queried only when Squid starts up, not for every request.
#
#Default:
# as_whois_server whois.ra.net
# as_whois_server whois.ra.net

#  TAG: wccp_router
#  TAG: wccp2_router
#    Use this option to define your WCCP ``home'' router for
#    Squid.
#
#    wccp_router supports a single WCCP(v1) router
#
#    wccp2_router supports multiple WCCPv2 routers
#
#    only one of the two may be used at the same time and defines
#    which version of WCCP to use.
#
#Default:
# wccp_router 0.0.0.0

#  TAG: wccp_version
#    This directive is only relevant if you need to set up WCCP(v1)
#    to some very old and end-of-life Cisco routers. In all other
#    setups it must be left unset or at the default setting.
#    It defines an internal version in the WCCP(v1) protocol,
#    with version 4 being the officially documented protocol.
#
#    According to some users, Cisco IOS 11.2 and earlier only
#    support WCCP version 3.  If you're using that or an earlier
#    version of IOS, you may need to change this value to 3, otherwise
#    do not specify this parameter.
#
#Default:
# wccp_version 4

#  TAG: wccp2_rebuild_wait
#    If this is enabled Squid will wait for the cache dir rebuild to finish
#    before sending the first wccp2 HereIAm packet
#
#Default:
# wccp2_rebuild_wait on

#  TAG: wccp2_forwarding_method
#    WCCP2 allows the setting of forwarding methods between the
#    router/switch and the cache.  Valid values are as follows:
#
#    1 - GRE encapsulation (forward the packet in a GRE/WCCP tunnel)
#    2 - L2 redirect (forward the packet using Layer 2/MAC rewriting)
#
#    Currently (as of IOS 12.4) cisco routers only support GRE.
#    Cisco switches only support the L2 redirect assignment method.
#
#Default:
# wccp2_forwarding_method 1

#  TAG: wccp2_return_method
#    WCCP2 allows the setting of return methods between the
#    router/switch and the cache for packets that the cache
#    decides not to handle.  Valid values are as follows:
#
#    1 - GRE encapsulation (forward the packet in a GRE/WCCP tunnel)
#    2 - L2 redirect (forward the packet using Layer 2/MAC rewriting)
#
#    Currently (as of IOS 12.4) cisco routers only support GRE.
#    Cisco switches only support the L2 redirect assignment.
#
#    If the "ip wccp redirect exclude in" command has been
#    enabled on the cache interface, then it is still safe for
#    the proxy server to use a l2 redirect method even if this
#    option is set to GRE.
#
#Default:
# wccp2_return_method 1

#  TAG: wccp2_assignment_method
#    WCCP2 allows the setting of methods to assign the WCCP hash
#    Valid values are as follows:
#
#    1 - Hash assignment
#    2 - Mask assignment
#
#    As a general rule, cisco routers support the hash assignment method
#    and cisco switches support the mask assignment method.
#
#Default:
# wccp2_assignment_method 1

#  TAG: wccp2_service
#    WCCP2 allows for multiple traffic services. There are two
#    types: "standard" and "dynamic". The standard type defines
#    one service id - http (id 0). The dynamic service ids can be from
#    51 to 255 inclusive.  In order to use a dynamic service id
#    one must define the type of traffic to be redirected; this is done
#    using the wccp2_service_info option.
#
#    The "standard" type does not require a wccp2_service_info option,
#    just specifying the service id will suffice.
#
#    MD5 service authentication can be enabled by adding
#    "password=<password>" to the end of this service declaration.
#
#    Examples:
#
#    wccp2_service standard 0    # for the 'web-cache' standard service
#    wccp2_service dynamic 80    # a dynamic service type which will be
#                    # fleshed out with subsequent options.
#    wccp2_service standard 0 password=foo
#
#
#Default:
# wccp2_service standard 0

#  TAG: wccp2_service_info
#    Dynamic WCCPv2 services require further information to define the
#    traffic you wish to have diverted.
#
#    The format is:
#
#    wccp2_service_info <id> protocol=<protocol> flags=<flag>,<flag>..
#        priority=<priority> ports=<port>,<port>..
#
#    The relevant WCCPv2 flags:
#    + src_ip_hash, dst_ip_hash
#    + source_port_hash, dest_port_hash
#    + src_ip_alt_hash, dst_ip_alt_hash
#    + src_port_alt_hash, dst_port_alt_hash
#    + ports_source
#
#    The port list can be one to eight entries.
#
#    Example:
#
#    wccp2_service_info 80 protocol=tcp flags=src_ip_hash,ports_source
#        priority=240 ports=80
#
#    Note: the service id must have been defined by a previous
#    'wccp2_service dynamic <id>' entry.
#
#Default:
# none

#  TAG: wccp2_weight
#    Each cache server gets assigned a set of the destination
#    hash proportional to their weight.
#
#Default:
# wccp2_weight 10000

#  TAG: wccp_address
#  TAG: wccp2_address
#    Use this option if you require WCCP to use a specific
#    interface address.
#
#    The default behavior is to not bind to any specific address.
#
#Default:
# wccp_address 0.0.0.0
# wccp2_address 0.0.0.0


# DELAY POOL PARAMETERS (all require DELAY_POOLS compilation option)
# -----------------------------------------------------------------------------

#  TAG: delay_pools
#    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.
#
#Default:
# delay_pools 0

#  TAG: delay_class
#    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"
#
#Default:
# none

#  TAG: delay_access
#    This is used to determine which delay pool a request falls into.
#
#    delay_access is sorted per pool and the matching starts with pool 1,
#    then pool 2, ..., and finally pool N. The first delay pool where the
#    request is allowed is selected for the request. If it does not allow
#    the request to any pool then the request is not delayed (default).
#
#    For example, if you want some_big_clients in delay
#    pool 1 and lotsa_little_clients in delay pool 2:
#
#Example:
# delay_access 1 allow some_big_clients
# delay_access 1 deny all
# delay_access 2 allow lotsa_little_clients
# delay_access 2 deny all
#
#Default:
# none

#  TAG: delay_parameters
#    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 600/8000
#
#    There must be one delay_parameters line for each delay pool.
#
#Default:
# none

#  TAG: delay_initial_bucket_level    (percent, 0-100)
#    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).
#
#Default:
# delay_initial_bucket_level 50

#  TAG: incoming_icp_average
#  TAG: incoming_http_average
#  TAG: incoming_dns_average
#  TAG: min_icp_poll_cnt
#  TAG: min_dns_poll_cnt
#  TAG: min_http_poll_cnt
#    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!
#
#Default:
# incoming_icp_average 6
# incoming_http_average 4
# incoming_dns_average 4
# min_icp_poll_cnt 8
# min_dns_poll_cnt 8
# min_http_poll_cnt 8

#  TAG: max_open_disk_fds
#    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.
#
#Default:
# max_open_disk_fds 0

#  TAG: offline_mode
#    Enable this option and Squid will never try to validate cached
#    objects.
#
#Default:
# offline_mode off

#  TAG: uri_whitespace
#    What to do with requests that have whitespace characters in the
#    URI.  Options:
#
#    strip:  The whitespace characters are stripped out of the URL.
#        This is the behavior recommended by RFC2396.
#    deny:   The request is denied.  The user receives an "Invalid
#        Request" message.
#    allow:  The request is allowed and the URI is not changed.  The
#        whitespace characters remain in the URI.  Note the
#        whitespace is passed to redirector processes if they
#        are in use.
#    encode:    The request is allowed and the whitespace characters are
#        encoded according to RFC1738.  This could be considered
#        a violation of the HTTP/1.1
#        RFC because proxies are not allowed to rewrite URI's.
#    chop:    The request is allowed and the URI is chopped at the
#        first whitespace.  This might also be considered a
#        violation.
#
#Default:
# uri_whitespace strip

#  TAG: broken_posts
#    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 RFC2068 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
#
#Default:
# none

#  TAG: mcast_miss_addr
# Note: This option is only available if Squid is rebuilt with the
#       --enable-multicast-miss option
#
#    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.
#
#Default:
# mcast_miss_addr 255.255.255.255

#  TAG: mcast_miss_ttl
# Note: This option is only available if Squid is rebuilt with the
#       --enable-multicast-miss option
#
#    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.
#
#Default:
# mcast_miss_ttl 16

#  TAG: mcast_miss_port
# Note: This option is only available if Squid is rebuilt with the
#       --enable-multicast-miss option
#
#    This is the port number to be used in conjunction with
#    'mcast_miss_addr'.
#
#Default:
# mcast_miss_port 3135

#  TAG: mcast_miss_encode_key
# Note: This option is only available if Squid is rebuilt with the
#       --enable-multicast-miss option
#
#    The URLs that are sent in the multicast miss stream are
#    encrypted.  This is the encryption key.
#
#Default:
# mcast_miss_encode_key XXXXXXXXXXXXXXXX

#  TAG: nonhierarchical_direct
#    By default, Squid will send any non-hierarchical requests
#    (matching hierarchy_stoplist or not cacheable request type) direct
#    to origin servers.
#
#    If you set this to off, Squid will prefer to send these
#    requests to parents.
#
#    Note that in most configurations, by turning this off you will only
#    add latency to these request without any improvement in global hit
#    ratio.
#
#    If you are inside an firewall see never_direct instead of
#    this directive.
#
#Default:
# nonhierarchical_direct on

#  TAG: prefer_direct
#    Normally Squid tries to use parents for most requests. If you for some
#    reason like it to first try going direct and only use a parent if
#    going direct fails set this to on.
#
#    By combining nonhierarchical_direct off and prefer_direct on you
#    can set up Squid to use a parent as a backup path if going direct
#    fails.
#
#    Note: If you want Squid to use parents for all requests see
#    the never_direct directive. prefer_direct only modifies how Squid
#    acts on cacheable requests.
#
#Default:
# prefer_direct off

#  TAG: strip_query_terms
#    By default, Squid strips query terms from requested URLs before
#    logging.  This protects your user's privacy.
#
#Default:
# strip_query_terms on

#  TAG: coredump_dir
#    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.
#
#Default:
# coredump_dir none
#
# Leave coredumps in the first cache dir
coredump_dir /var/spool/squid

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

#  TAG: ignore_unknown_nameservers
#    By default Squid checks that DNS responses are received
#    from the same IP addresses they are sent to.  If they
#    don't match, Squid ignores the response and writes a warning
#    message to cache.log.  You can allow responses from unknown
#    nameservers by setting this option to 'off'.
#
#Default:
# ignore_unknown_nameservers on

#  TAG: digest_generation
#    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.
#
#Default:
# digest_generation on

#  TAG: digest_bits_per_entry
#    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.
#
#Default:
# digest_bits_per_entry 5

#  TAG: digest_rebuild_period    (seconds)
#    This is the number of seconds between Cache Digest rebuilds.
#
#Default:
# digest_rebuild_period 1 hour

#  TAG: digest_rewrite_period    (seconds)
#    This is the number of seconds between Cache Digest writes to
#    disk.
#
#Default:
# digest_rewrite_period 1 hour

#  TAG: digest_swapout_chunk_size    (bytes)
#    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.
#
#Default:
# digest_swapout_chunk_size 4096 bytes

#  TAG: digest_rebuild_chunk_percentage    (percent, 0-100)
#    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.
#
#Default:
# digest_rebuild_chunk_percentage 10

#  TAG: chroot
#    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.
#
#Default:
# none

#  TAG: client_persistent_connections
#  TAG: server_persistent_connections
#    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.
#
#Default:
# client_persistent_connections on
# server_persistent_connections on

#  TAG: persistent_connection_after_error
#    With this directive the use of persistent connections after
#    HTTP errors can be disabled. Useful if you have clients
#    who fail to handle errors on persistent connections proper.
#
#Default:
# persistent_connection_after_error off

#  TAG: detect_broken_pconn
#    Some servers have been found to incorrectly signal the use
#    of HTTP/1.0 persistent connections even on replies not
#    compatible, causing significant delays. This server problem
#    has mostly been seen on redirects.
#
#    By enabling this directive Squid attempts to detect such
#    broken replies and automatically assume the reply is finished
#    after 10 seconds timeout.
#
#Default:
# detect_broken_pconn off

#  TAG: balance_on_multiple_ip
#    Some load balancing servers based on round robin DNS have been
#    found not to preserve user session state across requests
#    to different IP addresses.
#
#    By default Squid rotates IP's per request. By disabling
#    this directive only connection failure triggers rotation.
#
#Default:
# balance_on_multiple_ip on

#  TAG: pipeline_prefetch
#    To boost the performance of pipelined requests to closer
#    match that of a non-proxied environment Squid can try to fetch
#    up to two requests in parallel from a pipeline.
#
#    Defaults to off for bandwidth management and access logging
#    reasons.
#
#Default:
# pipeline_prefetch off

#  TAG: extension_methods
#    Squid only knows about standardized HTTP request methods.
#    You can add up to 20 additional "extension" methods here.
#
#Default:
# none

#  TAG: request_entities
#    Squid defaults to deny GET and HEAD requests with request entities,
#    as the meaning of such requests are undefined in the HTTP standard
#    even if not explicitly forbidden.
#
#    Set this directive to on if you have clients which insists
#    on sending request entities in GET or HEAD requests. But be warned
#    that there is server software (both proxies and web servers) which
#    can fail to properly process this kind of request which may make you
#    vulnerable to cache pollution attacks if enabled.
#
#Default:
# request_entities off

#  TAG: high_response_time_warning    (msec)
#    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.
#
#Default:
# high_response_time_warning 0

#  TAG: high_page_fault_warning
#    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.
#
#Default:
# high_page_fault_warning 0

#  TAG: high_memory_warning
#    If the memory usage (as determined by mallinfo) exceeds
#    value, Squid prints a WARNING with debug level 0 to get
#    the administrators attention.
#
#Default:
# high_memory_warning 0

#  TAG: store_dir_select_algorithm
#    Set this to 'round-robin' as an alternative.
#
#Default:
# store_dir_select_algorithm least-load

#  TAG: forward_log
# Note: This option is only available if Squid is rebuilt with the
#       --enable-forward-log option
#
#    Logs the server-side requests.
#
#    This is currently work in progress.
#
#Default:
# none

#  TAG: ie_refresh    on|off
#    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.
#
#Default:
# ie_refresh off

#  TAG: vary_ignore_expire    on|off
#    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.
#
#Default:
# vary_ignore_expire off

#  TAG: sleep_after_fork    (microseconds)
#    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, these sleep delays will add up and your
#    Squid will not service requests for some amount of time
#    until all the child processes have been started.
#    On Windows value less then 1000 (1 milliseconds) are
#    rounded to 1000.
#
#Default:
# sleep_after_fork 0

#  TAG: minimum_expiry_time    (seconds)
#    The minimum caching time according to (Expires - Date)
#    Headers Squid honors if the object can't be revalidated
#    defaults to 60 seconds. In reverse proxy enorinments it
#    might be desirable to honor shorter object lifetimes. It
#    is most likely better to make your server return a
#    meaningful Last-Modified header however.
#
#Default:
# minimum_expiry_time 60 seconds

#  TAG: relaxed_header_parser    on|off|warn
#    In the default "on" setting Squid accepts certain forms
#    of non-compliant HTTP messages where it is unambiguous
#    what the sending application intended even if the message
#    is not correctly formatted. The messages is then normalized
#    to the correct form when forwarded by Squid.
#
#    If set to "warn" then a warning will be emitted in cache.log
#    each time such HTTP error is encountered.
#
#    If set to "off" then such HTTP errors will cause the request
#    or response to be rejected.
#
#Default:
# relaxed_header_parser on

#  TAG: max_filedesc
#    The maximum number of open file descriptors.
#       
#    WARNING: Changes of this value isn't respected by reconfigure
#    command. This value should be changed only if there isn't
#    any active squid process.
#
#    NOTE: This option is only supported by system with poll()
#    or epoll(). You can set this value by --with-maxfd during
#    compilation on system whith uses select().
#   
#    The maximum value for max_filedesc is set by --with-maxfd during
#    compilation.
#
#Default:
# max_filedesc 1024



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