Attachment 4098 Details for Bug 22411 – /etc/squid/squid.conf

/etc/squid/squid.conf

squid.conf (text/plain), 155.49 KB, created by Andrey Cherepanov on 2009-12-02 16:37:09 MSK

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Creator: Andrey Cherepanov

Created: 2009-12-02 16:37:09 MSK

Size: 155.49 KB

patch

obsolete

>
>#	WELCOME TO SQUID 2.6.STABLE22
>#	----------------------------
>#
>#	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.
>#
>
>
># OPTIONS FOR AUTHENTICATION
># -----------------------------------------------------------------------------
>
>#  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 hex encoded or ERR if the user (or his H(A1)
>#	hash) does not exists.  See RFC 2616 for the definition of H(A1).
>#	"ERR" responses may optionally be followed by a error description
>#	available as %m in the returned error page.
>#
>#	By default, the digest authentication scheme is not used unless a
>#	program is specified.
>#
>#	If you want to use a digest authenticator, 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 -c /usr/etc/digpass
>#
>#	"children" numberofchildren
>#	The number of authenticator processes to spawn. If you start too few
>#	squid will have to wait for them to process a backlog of credential
>#	verifications, slowing it down. When credential verifications are
>#	done via a (slow) network you are likely to need lots of
>#	authenticator processes.
>#	auth_param digest children 5
>#
>#	"concurrency" numberofconcurrentrequests
>#	The number of concurrent requests/channels the helper supports.
>#	Changes the protocol used to include a channel number first on
>#	the request/response line, allowing multiple requests to be sent
>#	to the same helper in parallell without wating for the response.
>#	Must not be set unless it's known the helper supports this.
>#
>#	"realm" realmstring
>#	Specifies the realm name which is to be reported to the client for the
>#	digest proxy authentication scheme (part of the text the user will see
>#	when prompted their username and password).
>#	auth_param digest realm Squid proxy-caching web server
>#
>#	"nonce_garbage_interval" timeinterval
>#	Specifies the interval that nonces that have been issued to clients are
>#	checked for validity.
>#	auth_param digest nonce_garbage_interval 5 minutes
>#
>#	"nonce_max_duration" timeinterval
>#	Specifies the maximum length of time a given nonce will be valid for.
>#	auth_param digest nonce_max_duration 30 minutes
>#
>#	"nonce_max_count" number
>#	Specifies the maximum number of times a given nonce can be used.
>#	auth_param digest nonce_max_count 50
>#
>#	"nonce_strictness" on|off
>#	Determines if squid requires strict increment-by-1 behavior for nonce
>#	counts, or just incrementing (off - for use when useragents generate
>#	nonce counts that occasionally miss 1 (ie, 1,2,4,6)).
>#	auth_param digest nonce_strictness off
>#
>#	"check_nonce_count" on|off
>#	This directive if set to off can disable the nonce count check
>#	completely to work around buggy digest qop implementations in certain
>#	mainstream browser versions. Default on to check the nonce count to
>#	protect from authentication replay attacks.
>#	auth_param digest check_nonce_count on
>#
>#	"post_workaround" on|off
>#	This is a workaround to certain buggy browsers who sends an incorrect
>#	request digest in POST requests when reusing the same nonce as acquired
>#	earlier in response to a GET request.
>#	auth_param digest post_workaround off
>#
>#	=== NTLM scheme options follow ===
>#
>#	"program" cmdline
>#	Specify the command for the external NTLM authenticator. Such a
>#	program participates in the NTLMSSP exchanges between Squid and the
>#	client and reads commands according to the Squid NTLMSSP helper
>#	protocol. See helpers/ntlm_auth/ for details. Recommended ntlm
>#	authenticator is ntlm_auth from Samba-3.X, but a number of other
>#	ntlm authenticators is available.
>#
>#	By default, the ntlm authentication scheme is not used unless a
>#	program is specified.
>#
>#	auth_param ntlm program /path/to/samba/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp
>#
>#	"children" numberofchildren
>#	The number of authenticator processes to spawn. If you start too few
>#	squid will have to wait for them to process a backlog of credential
>#	verifications, slowing it down. When credential verifications are
>#	done via a (slow) network you are likely to need lots of
>#	authenticator processes.
>#	auth_param ntlm children 5
>#
>#	"keep_alive" on|off
>#	This option enables the use of keep-alive on the initial
>#	authentication request. It has been reported some versions of MSIE
>#	have problems if this is enabled, but performance will be increased
>#	if enabled.
>#
>#	auth_param ntlm keep_alive on
>#
>#	=== Negotiate scheme options follow ===
>#
>#	"program" cmdline
>#	Specify the command for the external Negotiate authenticator. Such a
>#	program participates in the SPNEGO exchanges between Squid and the
>#	client and reads commands according to the Squid ntlmssp helper
>#	protocol. See helpers/ntlm_auth/ for details. Recommended SPNEGO
>#	authenticator is ntlm_auth from Samba-4.X.
>#
>#	By default, the Negotiate authentication scheme is not used unless a
>#	program is specified.
>#
>#	auth_param negotiate program /path/to/samba/bin/ntlm_auth --helper-protocol=gss-spnego
>#
>#	"children" numberofchildren
>#	The number of authenticator processes to spawn. If you start too few
>#	squid will have to wait for them to process a backlog of credential
>#	verifications, slowing it down. When credential verifications are
>#	done via a (slow) network you are likely to need lots of
>#	authenticator processes.
>#	auth_param negotiate children 5
>#
>#	"keep_alive" on|off
>#	If you experience problems with PUT/POST requests when using the
>#	Negotiate authentication scheme then you can try setting this to
>#	off. This will cause Squid to forcibly close the connection on
>#	the initial requests where the browser asks which schemes are
>#	supported by the proxy.
>#
>#	auth_param negotiate keep_alive on
>#
>#Recommended minimum configuration per scheme:
>#auth_param negotiate program <uncomment and complete this line to activate>
>#auth_param negotiate children 5
>#auth_param negotiate keep_alive on
>#auth_param ntlm program <uncomment and complete this line to activate>
>#auth_param ntlm children 5
>#auth_param ntlm keep_alive on
>#auth_param digest program <uncomment and complete this line>
>#auth_param digest children 5
>#auth_param digest realm Squid proxy-caching web server
>#auth_param digest nonce_garbage_interval 5 minutes
>#auth_param digest nonce_max_duration 30 minutes
>#auth_param digest nonce_max_count 50
>#auth_param basic program <uncomment and complete this line>
>#auth_param basic children 5
>#auth_param basic realm Squid proxy-caching web server
>#auth_param basic credentialsttl 2 hours
>#auth_param basic casesensitive off
>
>auth_param negotiate program /usr/lib/squid/squid_kerb_auth
>auth_param negotiate children 10
>auth_param negotiate keep_alive on
>auth_param basic program /usr/lib/squid/pam_auth
>acl AUTHENTICATED proxy_auth REQUIRED
>
>#  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
>
>
># ACCESS CONTROLS
># -----------------------------------------------------------------------------
>
>#  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
>#	  %EXT_USER	Username from external acl
>#	  %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
>#
>#	In addition to the above, any string specified in the referencing
>#	acl will also be included in the helper request line, after the
>#	specified formats (see the "acl external" directive)
>#
>#	The helper receives lines per the above format specification,
>#	and returns lines starting with OK or ERR indicating the validity
>#	of the request and optionally followed by additional keywords with
>#	more details.
>#
>#	General result syntax:
>#
>#	  OK/ERR keyword=value ...
>#
>#	Defined keywords:
>#
>#	  user=		The users name (login 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
>
>#  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).
>#	  #
>#	  # NOTE: proxy_auth can't be used in a transparent proxy as
>#	  # the browser needs to be configured for using a proxy in order
>#	  # to respond to proxy authentication.
>#
>#	acl aclname snmp_community string ...
>#	  # A community string to limit access to your SNMP Agent
>#	  # Example:
>#	  #
>#	  #	acl snmppublic snmp_community public
>#
>#	acl aclname maxconn number
>#	  # This will be matched when the client's IP address has
>#	  # more than <number> HTTP connections established.
>#
>#	acl aclname max_user_ip [-s] number
>#	  # This will be matched when the user attempts to log in from more
>#	  # than <number> different ip addresses. The authenticate_ip_ttl
>#	  # parameter controls the timeout on the ip entries.
>#	  # If -s is specified the limit is strict, denying browsing
>#	  # from any further IP addresses until the ttl has expired. Without
>#	  # -s Squid will just annoy the user by "randomly" denying requests.
>#	  # (the counter is reset each time the limit is reached and a
>#	  # request is denied)
>#	  # NOTE: in acceleration mode or where there is mesh of child proxies,
>#	  # clients may appear to come from multiple addresses if they are
>#	  # going through proxy farms, so a limit of 1 may cause user problems.
>#
>#	acl aclname 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 max_body_size <bytes>
>#	  # This will be matched when the client's HTTP Request Body is
>#	  # greater than <bytes>.
>#
>#	acl aclname rep_header header-name [-i] any\.regex\.here
>#	  # regex match against any of the known reply headers. May be
>#	  # thought of as a superset of "browser", "referer" and "mime-type"
>#	  # ACLs.
>#	  #
>#	  # 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 helper
>#	  # use REQUIRED to accept any non-null user name.
>#
>#Examples:
>#acl macaddress arp 09:00:2b:23:45:67
>#acl myexample dst_as 1241
>#acl password proxy_auth REQUIRED
>#acl fileupload req_mime_type -i ^multipart/form-data$
>#acl javascript rep_mime_type -i ^application/x-javascript$
>#acl big_request max_body_size 10240
>
>#
>#Recommended minimum configuration:
>acl all src 0.0.0.0/0.0.0.0
>#acl all user_cert O "ALT Linux"
>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 Safe_ports port 443    # HTTPS
>acl Safe_ports port 70    # GOPHER
>acl Safe_ports port 280    # HTTP-MGMT
>acl Safe_ports port 21    # FTP
>acl Safe_ports port 591    # Filemaker
>acl SSL_ports port 5222-5223    # Jabber
>acl Safe_ports port 210    # WAIS
>acl Safe_ports port 873    # RSYNC
>acl SSL_ports port 8080    # Alterator
>acl Safe_ports port 901    # SWAT
>acl Safe_ports port 80    # HTTP
>acl Safe_ports port 777    # Multilingual HTTP
>acl SSL_ports port 443    # HTTPS (C)
>acl SSL_ports port 873    # RSYNC (C)
>acl Safe_ports port 488    # GSS-HTTP
>acl Safe_ports port 563    # SNEWS
>acl Safe_ports port 631    # CUPS
>acl Safe_ports port 1025-65535   # Other ports
>acl SSL_ports port 563    # SNEWS (C)
>
>#  TAG: http_access
>#	Allowing or Denying access based on defined access lists
>#
>#	Access to the HTTP port:
>#	http_access allow|deny [!]aclname ...
>#
>#	NOTE on default values:
>#
>#	If there are no "access" lines present, the default is to deny
>#	the request.
>#
>#	If none of the "access" lines cause a match, the default is the
>#	opposite of the last line in the list.  If the last line was
>#	deny, the default is allow.  Conversely, if the last line
>#	is allow, the default will be deny.  For these reasons, it is a
>#	good idea to have an "deny all" or "allow all" entry at the end
>#	of your access lists to avoid potential confusion.
>#
>#Default:
># http_access deny all
>
>#
>#Recommended minimum configuration:
>#
># Only allow cachemgr access from localhost
>http_access allow manager localhost
>http_access deny manager
># Deny requests to unknown ports
>http_access deny !Safe_ports
># Deny CONNECT to other than SSL ports
>acl CONNECT method CONNECT
>http_access deny CONNECT !SSL_ports
>#
># We strongly recommend the following be uncommented to protect innocent
># web applications running on the proxy server who think the only
># one who can access services on "localhost" is a local user
>
>#http_access deny to_localhost
>
>#
># INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
>#acl blacklist url_regex "/etc/squid/blacklist"
>#http_access deny blacklist
>
>acl our_networks src 127.0.0.0/8    # LOCALHOST
>acl our_networks src 192.168.0.1/24    # local net
># Deny access not form one of "our" IP networks
>http_access deny !our_networks
># Access policy for all users
>http_access allow all
>
># And finally deny all other access to this proxy
>http_access deny all
>
>#  TAG: http_access2
>#	Allowing or Denying access based on defined access lists
>#
>#	Identical to http_access, but runs after redirectors. If not set
>#	then only http_access is used.
>#
>#Default:
># none
>
>#  TAG: http_reply_access
>#	Allow replies to client requests. This is complementary to http_access.
>#
>#	http_reply_access allow|deny [!] aclname ...
>#
>#	NOTE: if there are no access lines present, the default is to allow
>#	all replies
>#
>#	If none of the access lines cause a match the opposite of the
>#	last line will apply. Thus it is good practice to end the rules
>#	with an "allow all" or "deny all" entry.
>#
>#Default:
># http_reply_access allow all
>
>#  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
>#	Allowing or Denying access to the HTCP port based on defined
>#	access lists
>#
>#	htcp_access  allow|deny [!]aclname ...
>#
>#	See http_access for details
>#
>#	NOTE: The default if no htcp_access lines are present is to
>#	deny all traffic. This default may cause problems with peers
>#	using the htcp or htcp-oldsquid options.
>#
>##Allow HTCP queries from everyone
>#htcp_access allow all
>#
>#Default:
># htcp_access deny all
>
>#  TAG: htcp_clr_access
>#	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: 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: 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
>
>
># OPTIONS FOR X-Forwarded-For
># -----------------------------------------------------------------------------
>
>#  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
>
>
># 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.
>#
>#	If you are running Squid in accelerator mode, you
>#	probably want to listen on port 80 also, or instead.
>#
>#	You may specify multiple socket addresses on multiple lines.
>#
>#	Options:
>#
>#	   transparent	Support for transparent interception of
>#			outgoing requests without browser settings.
>#
>#	   tproxy	Support Linux TPROXY for spoofing outgoing
>#			connections using the client IP address.
>#
>#	   accel	Accelerator mode. Also needs at least one
>#			of vhost/vport/defaultsite.
>#
>#	   defaultsite=domainname
>#			What to use for the Host: header if it is not present
>#			in a request. Determines what site (not origin server)
>#			accelerators should consider the default.
>#			Implies accel.
>#
>#	   vhost	Accelerator mode using Host header for virtual
>#			domain support. Implies accel.
>#
>#	   vport	Accelerator with IP based virtual host support.
>#			Implies accel.
>#
>#	   vport=NN	As above, but uses specified port number rather
>#			than the http_port number. Implies accel.
>#
>#	   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)
>#
>#	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.
>#
>#Default:
># http_port 3128
>#
>
># Squid normally listens to port 3128
>http_port 3128
>
>#  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:
>#
>#	   accel	Accelerator mode. Also needs at least one of
>#	   	        defaultsite or vhost.
>#
>#	   defaultsite=	The name of the https site presented on
>#			this port. Implies accel.
>#
>#	   vhost	Accelerator mode using Host header for virtual
>#			domain support. Requires a wildcard certificate
>#			or other certificate valid for more than one domain.
>#			Implies accel.
>#
>#	   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.
>#
>#	   vport	Accelerator with IP based virtual host support.
>#
>#	   vport=NN	As above, but uses specified port number rather
>#			than the https_port number. Implies accel.
>#
>#
>#Default:
># none
>
>#  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 good_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
>#	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 10.0.0.0/24
>#	acl good_service_net src 10.0.1.0/24 10.0.2.0/24
>#	tcp_outgoing_address 10.1.0.1 normal_service_net
>#	tcp_outgoing_address 10.1.0.2 good_service_net
>#	tcp_outgoing_address 10.1.0.3
>#
>#	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
>
>
># SSL OPTIONS
># -----------------------------------------------------------------------------
>
>#  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
>#	file containing CA certificates to use when verifying server
>#	certificates while proxying https:// URLs
>#
>#Default:
># none
>
>#  TAG: sslproxy_capath
>#	directory containing CA certificates to use when verifying
>#	server certificates while proxying https:// URLs
>#
>#Default:
># none
>
>#  TAG: sslproxy_flags
>#	Various flags modifying the use of SSL while proxying https:// URLs:
>#	    DONT_VERIFY_PEER    Accept certificates even if they fail to
>#				verify.
>#	    NO_DEFAULT_CA       Don't use the default CA list built in
>#				to OpenSSL.
>#
>#Default:
># none
>
>#  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
>
>
># 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 default
>#	cache_peer sib1.foo.net         sibling   3128  3130  proxy-only
>#	cache_peer sib2.foo.net         sibling   3128  3130  proxy-only
>#
>#	      type:  either 'parent', 'sibling', or 'multicast'.
>#
>#	proxy-port:  The port number where the cache listens for proxy
>#		     requests.
>#
>#	  icp-port:  Used for querying neighbor caches about
>#		     objects.  To have a non-ICP neighbor
>#		     specify '7' for the ICP port and make sure the
>#		     neighbor machine has the UDP echo port
>#		     enabled in its /etc/inetd.conf file.
>#		NOTE: Also requires icp_port option enabled to send/receive
>#		      requests via this method.
>#
>#	    options: proxy-only
>#		     weight=n
>#		     ttl=n
>#		     no-query
>#		     default
>#		     round-robin
>#		     carp
>#		     multicast-responder
>#		     closest-only
>#		     no-digest
>#		     no-netdb-exchange
>#		     no-delay
>#		     login=user:password | PASS | *:password
>#		     connect-timeout=nn
>#		     digest-url=url
>#		     allow-miss
>#		     max-conn=n
>#		     htcp
>#		     htcp-oldsquid
>#		     originserver
>#		     userhash
>#		     sourcehash
>#		     name=xxx
>#		     monitorurl=url
>#		     monitorsize=sizespec
>#		     monitorinterval=seconds
>#		     monitortimeout=seconds
>#		     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 affect the selection of a peer
>#		     during any weighted peer-selection mechanisms.
>#		     The weight must be an integer; default is 1,
>#		     larger weights are favored more.
>#		     This option does not affect parent selection if a peering
>#		     protocol is not in use.
>#
>#		     use '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" if a peer cannot be located
>#		     by any of the peer-selection mechanisms.
>#		     If specified more than once, only the first is used.
>#
>#		     use 'round-robin' to define a set of parents which
>#		     should be used in a round-robin fashion in the
>#		     absence of any ICP queries.
>#
>#		     use 'carp' to define a set of parents which should
>#		     be used as a CARP array. The requests will be
>#		     distributed among the parents based on the CARP load
>#		     balancing hash function based on their weight.
>#
>#		     'multicast-responder' indicates the named peer
>#		     is a member of a multicast group.  ICP queries will
>#		     not be sent directly to the peer, but ICP replies
>#		     will be accepted from it.
>#
>#		     'closest-only' indicates that, for ICP_OP_MISS
>#		     replies, we'll only forward CLOSEST_PARENT_MISSes
>#		     and never FIRST_PARENT_MISSes.
>#
>#		     use 'no-digest' to NOT request cache digests from
>#		     this neighbor.
>#
>#		     'no-netdb-exchange' disables requesting ICMP
>#		     RTT database (NetDB) from the neighbor.
>#
>#		     use 'no-delay' to prevent access to this neighbor
>#		     from influencing the delay pools.
>#
>#		     use 'login=user:password' if this is a personal/workgroup
>#		     proxy and your parent requires proxy authentication.
>#		     Note: The string can include URL escapes (i.e. %20 for
>#		     spaces). This also means % must be written as %%.
>#
>#		     use 'login=PASS' if users must authenticate against
>#		     the upstream proxy or in the case of a reverse proxy
>#		     configuration, the origin web server.  This will pass
>#		     the users credentials as they are to the peer.
>#		     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).
>#		     Also be warned this will expose your users proxy
>#		     password to the peer. USE WITH CAUTION
>#
>#		     use 'login=*:password' to pass the username to the
>#		     upstream cache, but with a fixed password. This is meant
>#		     to be used when the peer is in another administrative
>#		     domain, but it is still needed to identify each user.
>#		     The star can optionally be followed by some extra
>#		     information which is added to the username. This can
>#		     be used to identify this proxy to the peer, similar to
>#		     the login=username:password option above.
>#
>#		     use 'connect-timeout=nn' to specify a peer
>#		     specific connect timeout (also see the
>#		     peer_connect_timeout directive)
>#
>#		     use 'digest-url=url' to tell Squid to fetch the cache
>#		     digest (if digests are enabled) for this host from
>#		     the specified URL rather than the Squid default
>#		     location.
>#
>#		     use 'allow-miss' to disable Squid's use of only-if-cached
>#		     when forwarding requests to siblings. This is primarily
>#		     useful when icp_hit_stale is used by the sibling. To
>#		     extensive use of this option may result in forwarding
>#		     loops, and you should avoid having two-way peerings
>#		     with this option. (for example to deny peer usage on
>#		     requests from peer by denying cache_peer_access if the
>#		     source is a peer)
>#
>#		     use 'max-conn=n' to limit the amount of connections Squid
>#		     may open to this peer.
>#
>#		     use 'htcp' to send HTCP, instead of ICP, queries
>#		     to the neighbor.  You probably also want to
>#		     set the "icp port" to 4827 instead of 3130.
>#		     You must also allow this Squid htcp_access and
>#		     http_access in the peer Squid configuration.
>#
>#		     use 'htcp-oldsquid' to send HTCP to old Squid versions
>#		     You must also allow this Squid htcp_access and
>#		     http_access in the peer Squid configuration.
>#
>#		     '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-balance amongst 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 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 connections to this peer should
>#		     be SSL/TLS encrypted.
>#
>#		     use 'sslcert=/path/to/ssl/certificate' to specify a client
>#		     SSL certificate to use when connecting to this peer.
>#
>#		     use 'sslkey=/path/to/ssl/key' to specify the private SSL
>#		     key corresponding to sslcert above. If 'sslkey' is not
>#		     specified 'sslcert' is assumed to reference a
>#		     combined file containing both the certificate and the key.
>#
>#		     use sslversion=1|2|3|4 to specify the SSL version to use
>#		     when connecting to this peer
>#			1 = automatic (default)
>#			2 = SSL v2 only
>#			3 = SSL v3 only
>#			4 = TLS v1 only
>#
>#		     use sslcipher=... to specify the list of valid SSL ciphers
>#		     to use when connecting to this peer.
>#
>#		     use ssloptions=... to specify various SSL engine options:
>#			NO_SSLv2  Disallow the use of SSLv2
>#			NO_SSLv3  Disallow the use of SSLv3
>#			NO_TLSv1  Disallow the use of TLSv1
>#		     See src/ssl_support.c or the OpenSSL documentation for
>#		     a more complete list.
>#
>#		     use sslcafile=... to specify a file containing
>#		     additional CA certificates to use when verifying the
>#		     peer certificate.
>#
>#		     use sslcapath=... to specify a directory containing
>#		     additional CA certificates to use when verifying the
>#		     peer certificate.
>#
>#		     use sslcrlfile=... to specify a certificate revocation
>#		     list file to use when verifying the peer certificate.
>#
>#		     use sslflags=... to specify various flags modifying the
>#		     SSL implementation:
>#			DONT_VERIFY_PEER
>#				Accept certificates even if they fail to
>#				verify.
>#			NO_DEFAULT_CA
>#				Don't use the default CA list built in
>#				to OpenSSL.
>#
>#		     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 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.
>#
>#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: 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: 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 cache.foo.org parent 3128 3130
>#	neighbor_type_domain cache.foo.org sibling .com .net
>#	neighbor_type_domain cache.foo.org sibling .au .de
>#
>#Default:
># none
>
>#  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 ?
>
>
># MEMORY CACHE OPTIONS
># -----------------------------------------------------------------------------
>
>#  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: 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: 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
>
>
># DISK CACHE OPTIONS
># -----------------------------------------------------------------------------
>
>#  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: 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_swap_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)
>#
>#	The null store type:
>#
>#	no options are allowed or required
>#
>#	Common options:
>#
>#	read-only, no new objects should be stored to this cache_dir
>#
>#	min-size=n, refers to the min object size this storedir will accept.
>#	It's used to restrict a storedir to only store large objects
>#	(e.g. aufs) while other storedirs are optimized for smaller objects
>#	(e.g. COSS). Defaults to 0.
>#
>#	max-size=n, refers to the max object size 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 2048 16 256
>
>#  TAG: store_dir_select_algorithm
>#	Set this to 'round-robin' as an alternative.
>#
>#Default:
># store_dir_select_algorithm least-load
>
>#  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: 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	(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 65536 KB
>
>#  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
>
>
># LOGFILE OPTIONS
># -----------------------------------------------------------------------------
>
>#  TAG: logformat
>#	Usage:
>#
>#	logformat <name> <format specification>
>#
>#	Defines an access log format.
>#
>#	The <format specification> is a string with embedded % format codes
>#
>#	% format codes all follow the same basic structure where all but
>#	the formatcode is optional. Output strings are automatically escaped
>#	as required according to their context and the output format
>#	modifiers are usually not needed, but can be specified if an explicit
>#	output format is desired.
>#
>#		% ["|[|'|#] [-] [[0]width] [{argument}] formatcode
>#
>#		"	output in quoted string format
>#		[	output in squid text log format as used by log_mime_hdrs
>#		#	output in URL quoted format
>#		'	output as-is
>#
>#		-	left aligned
>#		width	field width. If starting with 0 the
>#			output is zero padded
>#		{arg}	argument such as header name etc
>#
>#	Format codes:
>#
>#		>a	Client source IP address
>#		>A	Client FQDN
>#		>p	Client source port
>#		<A	Server IP address or peer name
>#		la	Local IP address (http_port)
>#		lp	Local port number (http_port)
>#		ts	Seconds since epoch
>#		tu	subsecond time (milliseconds)
>#		tl	Local time. Optional strftime format argument
>#			default %d/%b/%Y:%H:%M:%S %z
>#		tg	GMT time. Optional strftime format argument
>#			default %d/%b/%Y:%H:%M:%S %z
>#		tr	Response time (milliseconds)
>#		>h	Request header. Optional header name argument
>#			on the format header[:[separator]element]
>#		<h	Reply header. Optional header name argument
>#			as for >h
>#		un	User name
>#		ul	User name from authentication
>#		ui	User name from ident
>#		us	User name from SSL
>#		ue	User name from external acl helper
>#		Hs	HTTP status code
>#		Ss	Squid request status (TCP_MISS etc)
>#		Sh	Squid hierarchy status (DEFAULT_PARENT etc)
>#		mt	MIME content type
>#		rm	Request method (GET/POST etc)
>#		ru	Request URL
>#		rv	Request protocol version
>#		ea	Log string returned by external acl
>#		<st	Reply size including HTTP headers
>#		>st	Request size including HTTP headers
>#		st	Request+Reply size including HTTP headers
>#		%	a literal % character
>#
>#	The default formats available (which do not need re-defining) are:
>#
>#logformat squid %ts.%03tu %6tr %>a %Ss/%03Hs %<st %rm %ru %un %Sh/%<A %mt
>#logformat squidmime %ts.%03tu %6tr %>a %Ss/%03Hs %<st %rm %ru %un %Sh/%<A %mt [%>h] [%<h]
>#logformat common %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %Hs %<st %Ss:%Sh
>#logformat combined %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %Hs %<st "%{Referer}>h" "%{User-Agent}>h" %Ss:%Sh
>#
>#Default:
># none
>
>#  TAG: access_log
>#	These files log client request activities. Has a line every HTTP or
>#	ICP request. The format is:
>#	access_log <filepath> [<logformat name> [acl acl ...]]
>#	access_log none [acl acl ...]]
>#
>#	Will log to the specified file using the specified format (which
>#	must be defined in a logformat directive) those entries which match
>#	ALL the acl's specified (which must be defined in acl clauses).
>#	If no acl is specified, all requests will be logged to this file.
>#
>#	To disable logging of a request use the filepath "none", in which case
>#	a logformat name should not be specified.
>#
>#	To log the request via syslog specify a filepath of "syslog":
>#
>#	access_log syslog[:facility.priority] [format [acl1 [acl2 ....]]]
>#	where facility could be any of:
>#	authpriv, daemon, local0 .. local7 or user.
>#
>#	And priority could be any of:
>#	err, warning, notice, info, debug.
>#
>#	Note: 2.6.STABLE14 and earlier only supports a slightly different
>#	and undocumented format with all uppercase LOG_FACILITY|LOG_PRIORITY
>access_log /var/log/squid/access.log squid
>
>#  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
>
>#  TAG: cache_log
>#	Cache logging file. This is where general information about
>#	your cache's behavior goes. You can increase the amount of data
>#	logged to this file with the "debug_options" tag below.
>#
>#Default:
>cache_log /var/log/squid/cache.log
>
>#  TAG: cache_store_log
>#	Logs the activities of the storage manager.  Shows which
>#	objects are ejected from the cache, and which objects are
>#	saved and for how long.  To disable, enter "none". There are
>#	not really utilities to analyze this data, so you can safely
>#	disable it.
>#
>#Default:
>cache_store_log /var/log/squid/store.log
>
>#  TAG: cache_swap_state
>#	Location for the cache "swap.state" file. This index file holds
>#	the metadata of objects saved on disk.  It is used to rebuild
>#	the cache during startup.  Normally this file resides in each
>#	'cache_dir' directory, but you may specify an alternate
>#	pathname here.  Note you must give a full filename, not just
>#	a directory. Since this is the index for the whole object
>#	list you CANNOT periodically rotate it!
>#
>#	If %s can be used in the file name it will be replaced with a
>#	a representation of the cache_dir name where each / is replaced
>#	with '.'. This is needed to allow adding/removing cache_dir
>#	lines when cache_swap_log is being used.
>#
>#	If have more than one 'cache_dir', and %s is not used in the name
>#	these swap logs will have names such as:
>#
>#		cache_swap_log.00
>#		cache_swap_log.01
>#		cache_swap_log.02
>#
>#	The numbered extension (which is added automatically)
>#	corresponds to the order of the 'cache_dir' lines in this
>#	configuration file.  If you change the order of the 'cache_dir'
>#	lines in this file, these index files will NOT correspond to
>#	the correct 'cache_dir' entry (unless you manually rename
>#	them).  We recommend you do NOT use this option.  It is
>#	better to keep these index files in each 'cache_dir' directory.
>#
>#Default:
># none
>
>#  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 file name rotation, but the logfiles are still closed
>#	and re-opened.  This will enable you to rename the logfiles
>#	yourself just before sending the rotate signal.
>#
>#	Note, the 'squid -k rotate' command normally sends a USR1
>#	signal to the running squid process.  In certain situations
>#	(e.g. on Linux with Async I/O), USR1 is used for other
>#	purposes, so -k rotate uses another signal.  It is best to get
>#	in the habit of using 'squid -k rotate' instead of 'kill -USR1
>#	<pid>'.
>#
>#logfile_rotate 0
>#
>#	ALT Linux is using the logrotate mechanism and therefore the
>#	rotation is done externaly, which means a default of 0 is
>#	required and therefore set. Modify /etc/logrotate.d/squid instead.
>#
>#Default:
># logfile_rotate 0
>
>#  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
>
>#  TAG: forward_log
>#	Logs the server-side requests.
>#
>#	This is currently work in progress.
>#
>#Default:
># none
>
>#  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: 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
>
>
># OPTIONS FOR FTP GATEWAYING
># -----------------------------------------------------------------------------
>
>#  TAG: ftp_user
>#	If you want the anonymous login password to be more informative
>#	(and enable the use of picky ftp servers), set this to something
>#	reasonable for your domain, like wwwuser@somewhere.net
>#
>#	The reason why this is domainless by default is the
>#	request can be made on the behalf of a user in any domain,
>#	depending on how the cache is used.
>#	Some ftp server also validate the email address is valid
>#	(for example perl.com).
>#
>#Default:
># ftp_user Squid@
>
>#  TAG: ftp_list_width
>#	Sets the width of ftp listings. This should be set to fit in
>#	the width of a standard browser. Setting this too small
>#	can cut off long filenames when browsing ftp sites.
>#
>#Default:
># ftp_list_width 32
>
>#  TAG: ftp_passive
>#	If your firewall does not allow Squid to use passive
>#	connections, turn off this option.
>#
>#Default:
># ftp_passive on
>
>#  TAG: ftp_sanitycheck
>#	For security and data integrity reasons Squid by default performs
>#	sanity checks of the addresses of FTP data connections ensure the
>#	data connection is to the requested server. If you need to allow
>#	FTP connections to servers using another IP address for the data
>#	connection turn this off.
>#
>#Default:
># ftp_sanitycheck on
>
>#  TAG: ftp_telnet_protocol
>#	The FTP protocol is officially defined to use the telnet protocol
>#	as transport channel for the control connection. However, many
>#	implementations are broken and does not respect this aspect of
>#	the FTP protocol.
>#
>#	If you have trouble accessing files with ASCII code 255 in the
>#	path or similar problems involving this ASCII code you can
>#	try setting this directive to off. If that helps, report to the
>#	operator of the FTP server in question that their FTP server
>#	is broken and does not follow the FTP standard.
>#
>#Default:
># ftp_telnet_protocol on
>
>
># OPTIONS FOR EXTERNAL SUPPORT PROGRAMS
># -----------------------------------------------------------------------------
>
>#  TAG: diskd_program
>#	Specify the location of the diskd executable.
>#	Note this is only useful if you have compiled in
>#	diskd as one of the store io modules.
>#
>#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
>#	Specify the location of the executable for the pinger process.
>#
>#Default:
># pinger_program /usr/lib/squid/pinger
>
>
># OPTIONS FOR URL REWRITING
># -----------------------------------------------------------------------------
>
>#  TAG: url_rewrite_program
>#	Specify the location of the executable for the URL rewriter.
>#	Since they can perform almost any function there isn't one included.
>#
>#	For each requested URL rewriter will receive on line with the format
>#
>#	URL <SP> client_ip "/" fqdn <SP> user <SP> method <SP> urlgroup <NL>
>#
>#	And the rewriter may return a rewritten URL. The other components of
>#	the request line does not need to be returned (ignored if they are).
>#
>#	The rewriter can also indicate that a client-side redirect should
>#	be performed to the new URL. This is done by prefixing the returned
>#	URL with "301:" (moved permanently) or 302: (moved temporarily).
>#
>#	It can also return a "urlgroup" that can subsequently be matched
>#	in cache_peer_access and similar ACL driven rules. An urlgroup is
>#	returned by prefixing the returned URL with "!urlgroup!".
>#
>#	By default, a URL rewriter is not used.
>#
># url_rewrite_program /path/to/redirector
>#
>#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 the redirector
>#	is a old-style single threaded redirector.
>#
>#	When this directive is set to a value >= 1 then the protocol
>#	used to communicate with the helper is modified to include
>#	a request ID in front of the request/response. The request
>#	ID from the request must be echoed back with the response
>#	to that request.
>#
>#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: 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: location_rewrite_program
>#	Specify the location of the executable for the Location rewriter,
>#	used to rewrite server generated redirects. Usually used in
>#	conjunction with a url_rewrite_program
>#
>#	For each Location header received the location rewriter will receive
>#	one line with the format:
>#
>#	   location URL <SP> requested URL <SP> urlgroup <NL>
>#
>#	And the rewriter may return a rewritten Location URL or a blank line.
>#	The other components of the request line does not need to be returned
>#	(ignored if they are).
>#
>#	By default, a Location rewriter is not used.
>#
>#Default:
># none
>
>#  TAG: location_rewrite_children
>#	The number of location rewriting processes to spawn. If you start
>#	too few Squid will have to wait for them to process a backlog of
>#	URLs, slowing it down. If you start too many they will use RAM
>#	and other system resources.
>#
>#Default:
># location_rewrite_children 5
>
>#  TAG: location_rewrite_concurrency
>#	The number of requests each Location rewriter helper can handle in
>#	parallel. Defaults to 0 which indicates that the helper
>#	is a old-style singlethreaded helper.
>#
>#Default:
># location_rewrite_concurrency 0
>
>#  TAG: location_rewrite_access
>#	If defined, this access list specifies which requests are
>#	sent to the location rewriting processes.  By default all Location
>#	headers are sent.
>#
>#Default:
># none
>
>
># OPTIONS FOR TUNING THE CACHE
># -----------------------------------------------------------------------------
>
>#  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: 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,
>#		as if the originserver had sent ``Cache-control: public''
>#		in the response header. Doing this VIOLATES the HTTP standard.
>#		Enabling this feature could make you liable for problems which
>#		it causes.
>#
>#	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 rpm$ 43200 100% 43200
>#refresh_pattern Packages.gz$ 1440 100% 1440
>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 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: 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: 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 20.
>#
>#Default:
># store_objects_per_bucket 20
>
>
># HTTP OPTIONS
># -----------------------------------------------------------------------------
>
>#  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: 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: 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: 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 RFC2616 section 4.1 on this matter:
>#
>#	  Note: certain buggy HTTP/1.0 client implementations generate an
>#	  extra CRLF's after a POST request. To restate what is explicitly
>#	  forbidden by the BNF, an HTTP/1.1 client must not preface or follow
>#	  a request with an extra CRLF.
>#
>#Example:
># acl buggy_server url_regex ^http://....
># broken_posts allow buggy_server
>#
>#Default:
># none
>
>#  TAG: via	on|off
>#	If set (default), Squid will include a Via header in requests and
>#	replies as required by RFC2616.
>#
>#Default:
># via on
>
>#  TAG: cache_vary
>#	When 'cache_vary' is set to off, response that have a
>#	Vary header will not be stored in the cache.
>#
>#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
>
>#  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
>
>#  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 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: 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: 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: 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
>
>
># 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 2 minutes
>
>#  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 1 minute
>
>#  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
>
>
># ADMINISTRATIVE PARAMETERS
># -----------------------------------------------------------------------------
>
>#  TAG: cache_mgr
>#	Email-address of local cache manager who will receive
>#	mail if the cache dies. The default is "webmaster".
>#
>#Default:
># cache_mgr webmaster
>
>#  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 comply
>#	with the standard Unix mail syntax:
>#	  mail-program recipient < mailfile
>#
>#	Optional command line options can be specified.
>#
>#Default:
># mail_program mail
>
>#  TAG: cache_effective_user
>#	If you start Squid as root, it will change its effective/real
>#	UID/GID to the user specified below.  The default is to change
>#	to UID to "squid".  If you define cache_effective_user, but not
>#	cache_effective_group, Squid sets the GID to the effective
>#	user's default group ID (taken from the password file) and
>#	supplementary group list from the from groups membership of
>#	cache_effective_user.
>#cache_effective_user squid
>#
>#Default:
># cache_effective_user squid
>
>#  TAG: cache_effective_group
>#	If you want Squid to run with a specific GID regardless of
>#	the group memberships of the effective user then set this
>#	to the group (or GID) you want Squid to run as. When set
>#	all other group privileges of the effective user is ignored
>#	and only this GID is effective. If Squid is not started as
>#	root the user starting Squid must be member of the specified
>#	group.
>#cache_effective_group squid
>#
>#Default:
># cache_effective_group squid
>
>#  TAG: httpd_suppress_version_string	on|off
>#	Suppress Squid version string info in HTTP headers and HTML error pages.
>#
>#Default:
># httpd_suppress_version_string off
>
>#  TAG: visible_hostname
>#	If you want to present a special hostname in error messages, etc,
>#	define this.  Otherwise, the return value of gethostname()
>#	will be used. If you have multiple caches in a cluster and
>#	get errors about IP-forwarding you must set them to have individual
>#	names with this setting.
>#
>#Default:
># none
>
>#  TAG: unique_hostname
>#	If you want to have multiple machines with the same
>#	'visible_hostname' you must give each machine a different
>#	'unique_hostname' so forwarding loops can be detected.
>#
>#Default:
># none
>
>#  TAG: hostname_aliases
>#	A list of other DNS names your cache has.
>#
>#Default:
># none
>
>#  TAG: umask
>#	Minimum umask which should be enforced while the proxy
>#	is running, in addition to the umask set at startup.
>#
>#	Note: Should start with a 0 to indicate the normal octal
>#	representation of umasks
>#
>#Default:
># umask 027
>
>
># OPTIONS FOR THE CACHE REGISTRATION SERVICE
># -----------------------------------------------------------------------------
>#
>#	This section contains parameters for the (optional) cache
>#	announcement service.  This service is provided to help
>#	cache administrators locate one another in order to join or
>#	create cache hierarchies.
>#
>#	An 'announcement' message is sent (via UDP) to the registration
>#	service by Squid.  By default, the announcement message is NOT
>#	SENT unless you enable it with 'announce_period' below.
>#
>#	The announcement message includes your hostname, plus the
>#	following information from this configuration file:
>#
>#		http_port
>#		icp_port
>#		cache_mgr
>#
>#	All current information is processed regularly and made
>#	available on the Web at http://www.ircache.net/Cache/Tracker/.
>
>#  TAG: announce_period
>#	This is how frequently to send cache announcements.  The
>#	default is `0' which disables sending the announcement
>#	messages.
>#
>#	To enable announcing your cache, just uncomment the line
>#	below.
>#
>#Default:
># announce_period 0
>#
>#To enable announcing your cache, just uncomment the line below.
>#announce_period 1 day
>
>#  TAG: announce_host
>#  TAG: announce_file
>#  TAG: announce_port
>#	announce_host and announce_port set the hostname and port
>#	number where the registration message will be sent.
>#
>#	Hostname will default to 'tracker.ircache.net' and port will
>#	default default to 3131.  If the 'filename' argument is given,
>#	the contents of that file will be included in the announce
>#	message.
>#
>#Default:
># announce_host tracker.ircache.net
># announce_port 3131
>
>
># HTTPD-ACCELERATOR OPTIONS
># -----------------------------------------------------------------------------
>
>#  TAG: httpd_accel_no_pmtu_disc	on|off
>#	In many setups of transparently intercepting proxies Path-MTU
>#	discovery can not work on traffic towards the clients. This is
>#	the case when the intercepting device does not fully track
>#	connections and fails to forward ICMP must fragment messages
>#	to the cache server.
>#
>#	If you have such setup and experience that certain clients
>#	sporadically hang or never complete requests set this to on.
>#
>#Default:
># httpd_accel_no_pmtu_disc off
>
>
># ICAP OPTIONS
># -----------------------------------------------------------------------------
>
>#  TAG: icap_enable	on|off
>#	If you want to enable the ICAP client module, set this to on.
>#
>#Default:
># icap_enable off
>
>#  TAG: icap_preview_enable	on|off
>#	Set this to 'on' if you want to enable the ICAP preview
>#	feature in Squid.
>#
>#Default:
># icap_preview_enable off
>
>#  TAG: icap_preview_size
>#	The default size of preview data to be sent to the ICAP server.
>#	-1 means no preview. This value might be overwritten on a per server
>#	basis by OPTIONS requests.
>#
>#Default:
># icap_preview_size -1
>
>#  TAG: icap_check_interval
>#        If an ICAP server does not respond, it gets marked as unreachable. Squid
>#	will try again to reach it after this time.
>#
>#Default:
># icap_check_interval 300
>
>#  TAG: icap_send_client_ip	on|off
>#	Allows Squid to add the "X-Client-IP" header if requested by
>#	an ICAP service in it's response to OPTIONS.
>#
>#Default:
># icap_send_client_ip off
>
>#  TAG: icap_send_server_ip	on|off
>#	Allows Squid to add the "X-Server-IP" header if requested by
>#	an ICAP service in it's response to OPTIONS.
>#
>#Default:
># icap_send_server_ip off
>
>#  TAG: icap_send_auth_user	on|off
>#	Allows Squid to add the "X-Authenticated-User" header if requested
>#	by an ICAP service in it's response to OPTIONS.
>#
>#Default:
># icap_send_auth_user off
>
>#  TAG: icap_auth_scheme
>#	Authentification scheme to pass to ICAP requests if
>#	icap_send_auth_user is enabled. The first occurence of "%u"
>#	is replaced by the authentified user name. If no "%u" is found,
>#	the username is added at the end of the scheme.
>#
>#	See http://www.ietf.org/internet-drafts/draft-stecher-icap-subid-00.txt,
>#	section 3.4 for details on this.
>#
>#	Examples:
>#
>#	icap_auth_scheme Local://%u
>#	icap_auth_scheme LDAP://ldap-server/cn=%u,dc=company,dc=com
>#	icap_auth_scheme WinNT://nt-domain/%u
>#	icap_auth_scheme Radius://radius-server/%u
>#
>#Default:
># icap_auth_scheme Local://%u
>
>#  TAG: icap_service
>#	Defines a single ICAP service
>#
>#	icap_service servicename vectoring_point bypass service_url [options ...]
>#
>#	vectoring_point = reqmod_precache|reqmod_postcache|respmod_precache|respmod_postcache
>#		This specifies at which point of request processing the ICAP
>#		service should be plugged in.
>#	bypass = 1|0
>#		If set to 1 and the ICAP server cannot be reached, the request will go
>#		through without being processed by an ICAP server
>#	service_url = icap://servername:port/service
>#
>#	Options:
>#
>#        no-keep-alive	To always close the connection to icap server
>#			after the transaction completes
>#
>#
>#	Note: reqmod_precache and respmod_postcache is not yet implemented
>#
>#	Load-balancing and high availability:
>#	You can obtain load-balancing and high availability by defining a
>#	named service with different definitions.  Then, the client
>#	loops through the different entities of the service providing
>#	load-balancing. If an entity is marked as unreachable, the client goes
>#	one step further to the next entity: you have the high-availability.
>#	See the service_1 definition below
>#
>#Example:
>#icap_service service_1 reqmod_precache 0 icap://icap1.mydomain.net:1344/reqmod
>#icap_service service_1 reqmod_precache 0 icap://icap2.mydomain.net:1344/reqmod no-keep-alive
>#icap_service service_2 respmod_precache 0 icap://icap3.mydomain.net:1344/respmod
>#
>#Default:
># none
>
>#  TAG: icap_class
>#	Defines an ICAP service chain. If there are multiple services per
>#	vectoring point, they are processed in the specified order.
>#
>#	icap_class classname servicename...
>#
>#Example:
>#icap_class class_1 service_1 service_2
>#icap class class_2 service_1 service_3
>#
>#Default:
># none
>
>#  TAG: icap_access
>#	Redirects a request through an ICAP service class, depending
>#	on given acls
>#
>#	icap_access classname allow|deny [!]aclname...
>#
>#	The icap_access statements are processed in the order they appear in
>#	this configuration file. If an access list matches, the processing stops.
>#	For an "allow" rule, the specified class is used for the request. A "deny"
>#	rule simply stops processing without using the class. You can also use the
>#	special classname "None".
>#
>#	For backward compatibility, it is also possible to use services
>#	directly here.
>#Example:
>#icap_access class_1 allow all
>#
>#Default:
># none
>
>
># DELAY POOL PARAMETERS
># -----------------------------------------------------------------------------
>
>#  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
>
>
># WCCPv1 AND WCCPv2 CONFIGURATION OPTIONS
># -----------------------------------------------------------------------------
>
>#  TAG: wccp_router
>#  TAG: wccp2_router
>#	Use this option to define your WCCP ``home'' router for
>#	Squid.
>#
>#	wccp_router supports a single WCCP(v1) router
>#
>#	wccp2_router supports multiple WCCPv2 routers
>#
>#	only one of the two may be used at the same time and defines
>#	which version of WCCP to use.
>#
>#Default:
># wccp_router 0.0.0.0
>
>#  TAG: wccp_version
>#	This directive is only relevant if you need to set up WCCP(v1)
>#	to some very old and end-of-life Cisco routers. In all other
>#	setups it must be left unset or at the default setting.
>#	It defines an internal version in the WCCP(v1) protocol,
>#	with version 4 being the officially documented protocol.
>#
>#	According to some users, Cisco IOS 11.2 and earlier only
>#	support WCCP version 3.  If you're using that or an earlier
>#	version of IOS, you may need to change this value to 3, otherwise
>#	do not specify this parameter.
>#
>#Default:
># wccp_version 4
>
>#  TAG: wccp2_rebuild_wait
>#	If this is enabled Squid will wait for the cache dir rebuild to finish
>#	before sending the first wccp2 HereIAm packet
>#
>#Default:
># wccp2_rebuild_wait on
>
>#  TAG: wccp2_forwarding_method
>#	WCCP2 allows the setting of forwarding methods between the
>#	router/switch and the cache.  Valid values are as follows:
>#
>#	1 - GRE encapsulation (forward the packet in a GRE/WCCP tunnel)
>#	2 - L2 redirect (forward the packet using Layer 2/MAC rewriting)
>#
>#	Currently (as of IOS 12.4) cisco routers only support GRE.
>#	Cisco switches only support the L2 redirect assignment method.
>#
>#Default:
># wccp2_forwarding_method 1
>
>#  TAG: wccp2_return_method
>#	WCCP2 allows the setting of return methods between the
>#	router/switch and the cache for packets that the cache
>#	decides not to handle.  Valid values are as follows:
>#
>#	1 - GRE encapsulation (forward the packet in a GRE/WCCP tunnel)
>#	2 - L2 redirect (forward the packet using Layer 2/MAC rewriting)
>#
>#	Currently (as of IOS 12.4) cisco routers only support GRE.
>#	Cisco switches only support the L2 redirect assignment.
>#
>#	If the "ip wccp redirect exclude in" command has been
>#	enabled on the cache interface, then it is still safe for
>#	the proxy server to use a l2 redirect method even if this
>#	option is set to GRE.
>#
>#Default:
># wccp2_return_method 1
>
>#  TAG: wccp2_assignment_method
>#	WCCP2 allows the setting of methods to assign the WCCP hash
>#	Valid values are as follows:
>#
>#	1 - Hash assignment
>#	2 - Mask assignment
>#
>#	As a general rule, cisco routers support the hash assignment method
>#	and cisco switches support the mask assignment method.
>#
>#Default:
># wccp2_assignment_method 1
>
>#  TAG: wccp2_service
>#	WCCP2 allows for multiple traffic services. There are two
>#	types: "standard" and "dynamic". The standard type defines
>#	one service id - http (id 0). The dynamic service ids can be from
>#	51 to 255 inclusive.  In order to use a dynamic service id
>#	one must define the type of traffic to be redirected; this is done
>#	using the wccp2_service_info option.
>#
>#	The "standard" type does not require a wccp2_service_info option,
>#	just specifying the service id will suffice.
>#
>#	MD5 service authentication can be enabled by adding
>#	"password=<password>" to the end of this service declaration.
>#
>#	Examples:
>#
>#	wccp2_service standard 0	# for the 'web-cache' standard service
>#	wccp2_service dynamic 80	# a dynamic service type which will be
>#					# fleshed out with subsequent options.
>#	wccp2_service standard 0 password=foo
>#
>#
>#Default:
># wccp2_service standard 0
>
>#  TAG: wccp2_service_info
>#	Dynamic WCCPv2 services require further information to define the
>#	traffic you wish to have diverted.
>#
>#	The format is:
>#
>#	wccp2_service_info <id> protocol=<protocol> flags=<flag>,<flag>..
>#	    priority=<priority> ports=<port>,<port>..
>#
>#	The relevant WCCPv2 flags:
>#	+ src_ip_hash, dst_ip_hash
>#	+ source_port_hash, dst_port_hash
>#	+ src_ip_alt_hash, dst_ip_alt_hash
>#	+ src_port_alt_hash, dst_port_alt_hash
>#	+ ports_source
>#
>#	The port list can be one to eight entries.
>#
>#	Example:
>#
>#	wccp2_service_info 80 protocol=tcp flags=src_ip_hash,ports_source
>#	    priority=240 ports=80
>#
>#	Note: the service id must have been defined by a previous
>#	'wccp2_service dynamic <id>' entry.
>#
>#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
>
>
># PERSISTENT CONNECTION HANDLING
># -----------------------------------------------------------------------------
>#
># Also see "pconn_timeout" in the TIMEOUTS section
>
>#  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
>
>
># CACHE DIGEST OPTIONS
># -----------------------------------------------------------------------------
>
>#  TAG: digest_generation
>#	This controls whether the server will generate a Cache Digest
>#	of its contents.
>#
>#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 wait time between Cache Digest rebuilds.
>#
>#Default:
># digest_rebuild_period 1 hour
>
>#  TAG: digest_rewrite_period	(seconds)
>#	This is the wait time 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
>
>
># SNMP OPTIONS
># -----------------------------------------------------------------------------
>
>#  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
>
>
># ICP OPTIONS
># -----------------------------------------------------------------------------
>
>#  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
>#	The port number where Squid sends and receives HTCP queries to
>#	and from neighbor caches.  A value of "0" disables HTCP support.
>#	If you wish to use HTCP, set this to "4827" to use the normal
>#	HTCP support.
>#
>#Default:
># htcp_port 0
>
>#  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: udp_incoming_address
>#	udp_incoming_address	is used for UDP packets received from other
>#				caches.
>#
>#	The default behavior is to not bind to any specific address.
>#
>#	Only change this if you want to have all UDP queries received on
>#	a specific interface/address.
>#
>#	NOTE: udp_incoming_address is used by the ICP, HTCP, and DNS
>#	modules. Altering it will affect all of them in the same manner.
>#
>#	see also; udp_outgoing_address
>#
>#	NOTE, udp_incoming_address and udp_outgoing_address can not
>#	have the same value since they both use the same port.
>#
>#Default:
># udp_incoming_address 0.0.0.0
>
>#  TAG: udp_outgoing_address
>#	udp_outgoing_address	is used for UDP packets sent out to other
>#				caches.
>#
>#	The default behavior is to not bind to any specific address.
>#
>#	Instead it will use the same socket as udp_incoming_address.
>#	Only change this if you want to have UDP queries sent using another
>#	address than where this Squid listens for UDP queries from other
>#	caches.
>#
>#	NOTE: udp_outgoing_address is used by the ICP, HTCP, and DNS
>#	modules. Altering it will affect all of them in the same manner.
>#
>#	see also; udp_incoming_address
>#
>#	NOTE, udp_incoming_address and udp_outgoing_address can not
>#	have the same value since they both use the same port.
>#
>#Default:
># udp_outgoing_address 255.255.255.255
>
>#  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: 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: 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: minimum_icp_query_timeout	(msec)
>#	Normally the ICP query timeout is determined dynamically.  But
>#	sometimes it can lead to very small timeouts, even lower than
>#	the normal latency variance on your link due to traffic.
>#	Use this option to put an lower limit on the dynamic timeout
>#	value.  Do NOT use this option to always use a fixed (instead
>#	of a dynamic) timeout value. To set a fixed timeout see the
>#	'icp_query_timeout' directive.
>#
>#Default:
># minimum_icp_query_timeout 5
>
>
># MULTICAST ICP OPTIONS
># -----------------------------------------------------------------------------
>
>#  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: mcast_miss_addr
>#	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
>#	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
>#	This is the port number to be used in conjunction with
>#	'mcast_miss_addr'.
>#
>#Default:
># mcast_miss_port 3135
>
>#  TAG: mcast_miss_encode_key
>#	The URLs that are sent in the multicast miss stream are
>#	encrypted.  This is the encryption key.
>#
>#Default:
># mcast_miss_encode_key XXXXXXXXXXXXXXXX
>
>#  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
>
>
># INTERNAL ICON OPTIONS
># -----------------------------------------------------------------------------
>
>#  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
>
>
># ERROR PAGE OPTIONS
># -----------------------------------------------------------------------------
>
>#  TAG: error_directory
>#	Directory where the error files are read from.
>#	/usr/share/squid/errors contains sets of error files
>#	in different languages. The default error directory
>#	is /usr/share/squid/errors/English.
>#
>#	If you wish to create your own versions of the default
>#	(English) error files, either to customize them to suit your
>#	language or company copy the template English files to another
>#	directory and point this tag at them.
>#
>#	The squid developers are interested in making squid available in
>#	a wide variety of languages. If you are making translations for a
>#	langauge that Squid does not currently provide please consider
>#	contributing your translation back to the project.
>#
>#error_directory /usr/share/squid/errors/English
>#
>#Default:
># error_directory /usr/share/squid/errors/English
>
>#  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.  Squid remembers the last
>#	acl it evaluated in http_access, and if a 'deny_info' line exists
>#	for that ACL Squid returns a corresponding error page.
>#
>#	The acl is typically the last acl on the http_access deny line which
>#	denied access. The exceptions to this rule are:
>#	- When Squid needs to request authentication credentials. It's then
>#	  the first authentication related acl encountered
>#	- When none of the http_access lines matches. It's then the last
>#	  acl processed on the last http_access line.
>#
>#	You may use ERR_ pages that come with Squid or create your own pages
>#	and put them into the configured errors/ directory.
>#
>#	Alternatively you can specify an error URL. The browsers will
>#	get redirected (302) to the specified URL. %s in the redirection
>#	URL will be replaced by the requested URL.
>#
>#	Alternatively you can tell Squid to reset the TCP connection
>#	by specifying TCP_RESET.
>#
>#Default:
># none
>
>
># OPTIONS INFLUENCING REQUEST FORWARDING 
># -----------------------------------------------------------------------------
>
>#  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: 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
>
>
># ADVANCED NETWORKING OPTIONS
># -----------------------------------------------------------------------------
>
>#  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: 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
>
>
># DNS OPTIONS
># -----------------------------------------------------------------------------
>
>#  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.
>#	This check is performed only when check_hostnames is set to on.
>#
>#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: 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: 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: 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: 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
>
>
># MISCELLANEOUS
># -----------------------------------------------------------------------------
>
>#  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: 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: 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: client_db	on|off
>#	If you want to disable collecting per-client statistics,
>#	turn off client_db here.
>#
>#Default:
># client_db on
>
>#  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: 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 on
>
>#  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: 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: 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: 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, if you use a HTTP
>#	port less than 1024 and try to reconfigure, you will may get an
>#	error saying that Squid can not open the port.
>#
>#Default:
># none
>
>#  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: 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
>#	this amount, Squid prints a WARNING with debug level 0 to get
>#	the administrators attention.
>#
>#Default:
># high_memory_warning 0 KB
>
>#  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, 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: max_filedesc
>#	The maximum number of open file descriptors.
>#
>#	WARNING: Changes of this value isn't respected by reconfigure
>#	command. This value should be changed only if there isn't
>#	any active squid process.
>#
>#	NOTE: This option is only supported by system with poll()
>#	or epoll(). You can set this value by --with-maxfd during
>#	compilation on system whith uses select().
>#
>#	The maximum value for max_filedesc is set by --with-maxfd during
>#	compilation.
>#
>#Default:
># max_filedesc 1024

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Attachments on bug 22411: 4098