在一家公司做了最后一个一项任务.web服务器A放在内网,通过通道程序连接上外网的服务器B.服务器B上安装了apache+squid.apache是利用虚拟机为服务器A提供双向代理.由于配置apache的缓存比较复杂,所以利用squid的缓存机制.这样就形成了两级双向代理.squid的版本不一样配置所用到的命令行也不一样.一个环节出现问题,这样复杂的架构是不会形成的.
原理:让squid代理80端口,接受所有的IE用户的请求.让apache监听81端口.apache建立一个虚拟机,根据域名匹配,将不同的web请求转发到指定的通道程序,通道程序再转发到内网的服务器.squid将IE的请求发送给apache,并且还将apche的返回数据发送给IE,squid还将数据缓存.apache也有缓存机制,但是不是很容易实现.而且squid是专业的web加速器,所以这里还是选择了squid.
配置方法:
1.配置squid,必须先知道你安装的版本.不同的版本所用到的配置选项是不一样的.例如:2.5版的httpd_accel_port在2.6版本被cache_peer替换了.
2.squid的默认启动用户是squid,所有对一些日志文件和缓存文件,文件拥有者必须是squid.启动squid可以是不同的用户,也不需要建立一个用户squid,然后再启动squid.只要保证squid缓存文件和日志文件的所有人是squid就可以了.
squid -z 是创建缓存文件,可以在启动之前先把缓存文件的树型机构建立起来.
3.squid提供了debug方式运行,这样用户可以得到更多的squid启动和运行状态的信息.squid -d 10.
4.squid的代理工作原理是:先接受IE的请求,然后解析请求中的域名,得到这个域名的IP,然后将数据发送给这个IP.如果你想截获squid不要将这个域名转发出去,就直接发送给本机处理,可以修改hosts文件.在配置过程中,IE发送请求去服务器B,但是squid并没有发送IE请求去apache,查看apache的转发日志,也没有看见这个请求.查看squid的access.log文件,发现它将这个请求发送到一个非本机的IP.所以我修改了hosts文件,将这个域名指向本机.这样squid就将请求发送给apache了.
5.squid和apache一起工作,squid监听80,apache监听81.利用squid的加速web工作原理.让squid对apache提供的web服务进行加速.本人是用squid2.6版本,具体配置再最后.
6.web加速配置
cache_peer 210.51.4.215 parent 81 0 no-query originserver weight=1 name=b
cache_peer_domain b www.aaawaaa.cn
acl all src 0.0.0.0/0.0.0.0
http_access allow all
never_direct allow all
cache_peer_access b allow all
这里是配置文件关键,squid相对apache是客户端.这里如果不配置访问规则,会导致访问权限问题.注意如果要做反向代理(二级转发)，还要注意配置never_direct。
7.虚拟机的名字也要配置：
visible_hostname a215(a215就是B服务器的名字). http_port 80 transparent对80端口作透明代理。
8.squid对动态页面没有缓存,如果想对动态页面缓存就必须让HTTP协议请求包含Last_Modified.这样可以让squid缓存你的页面.如果想对缓存的命中时间和命中率做出响应,可以用refresh_pattern.这里的Last-Modified可以通过网页语言实现.squid只对图片和静态页面有缓存.因为这些页面在传输的过程中会自动加上Last_Modified.
# 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 210.51.4.215:3128 transparent
http_port 80 transparent
http_port 3128
#http_port 3128 transparent
#always_direct allow all
# 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
#
# Defines an access log format.
#
# The
#
# % 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
#
# 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]
#
# 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
#
#
#logformat squid %ts.%03tu %6tr %>a %Ss/%03Hs %
#
#Default:
# none
# TAG: access_log
# These files log client request activities. Has a line every HTTP or
# ICP request. The format is:
# access_log
#
# 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
access_log /usr/local/squid/var/logs/access.log
# 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
cache_log /usr/local/squid/var/logs/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
cache_store_log /usr/local/squid/var/logs/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 [email protected]
#
# 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
#
# 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
#
# 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/libexec/ncsa_auth /usr/etc/passwd
#
# "children" numberofchildren
# The number of authenticator processes to spawn. If you start too few
# squid will have to wait for them to process a backlog of credential
# verifications, slowing it down. When 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
#auth_param negotiate children 5
#auth_param negotiate keep_alive on
#auth_param ntlm program
#auth_param ntlm children 5
#auth_param ntlm keep_alive on
#auth_param digest program
#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
#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
#
# acl aclname max_user_ip [-s] number
# # This will be matched when the user attempts to log in from more
# # than
# # 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 luhui src 192.168.123.0/255.255.255.0
acl laaa src 192.168.2.0/255.255.255.0
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
# 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 allow all
#
#Recommended minimum configuration:
#
# Only allow cachemgr access from localhost
http_access allow manager localhost
http_access allow luhui
http_access allow laaa
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
#i: 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 localhost
http_access allow localhost
#http_accel_host virtual
#httpd_accel_host 127.0.0.1
#httpd_accel_port 81
#httpd_accel_with_proxy on
#httpd_accel_uses_host_header on
#http_access deny all
#http_access deny all
http_access allow 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:
#http_accel_host virtual
#
# 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
#cache_peer www.foreverlily.cn parent 81 0 no-query originserver
cache_peer 210.51.4.215 parent 81 0 no-query originserver weight=1 name=a
cache_peer 210.51.4.215 parent 81 0 no-query originserver weight=1 name=b
cache_peer 210.51.4.215 parent 81 0 no-query originserver weight=1 name=c
cache_peer_domain c localhost
cache_peer_domain a www.foreverlily.cn
cache_peer_domain b www.aaawaaa.cn
acl all src 0.0.0.0/0.0.0.0
http_access allow all
never_direct allow all
cache_peer_access a allow all
cache_peer_access b allow all
cache_peer_access c allow all
#httpd_accel_port 81
# 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
visible_hostname a215
# 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
#
#
#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=
#
# 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
# priority=
#
# 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
#
#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