network/squid: Added to 12.0 repository

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+
+#	WELCOME TO SQUID 3.0.STABLE1
+#	----------------------------
+#
+#	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.
+#	If you use an authenticator, make sure you have 1 acl of type proxy_auth.
+#
+#	By default, the basic authentication scheme is not used unless a
+#	program is specified.
+#
+#	If you want to use the traditional NCSA proxy authentication, set
+#	this line to something like
+#
+#	auth_param basic program /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 password verifications are
+#	done via a (slow) network you are likely to need lots of
+#	authenticator processes.
+#	auth_param basic children 5
+#
+#	"concurrency" concurrency
+#	The number of concurrent requests the helper can process.
+#	The default of 0 is used for helpers who only supports
+#	one request at a time. Setting this changes the protocol used to
+#	include a channel number first on the request/response line, allowing
+#	multiple requests to be sent to the same helper in parallell without
+#	wating for the response.
+#	Must not be set unless it's known the helper supports this.
+#	auth_param basic concurrency 0
+#
+#	"realm" realmstring
+#	Specifies the realm name which is to be reported to the
+#	client for the basic proxy authentication scheme (part of
+#	the text the user will see when prompted their username and
+#	password). There is no default.
+#	auth_param basic realm Squid proxy-caching web server
+#
+#	"credentialsttl" timetolive
+#	Specifies how long squid assumes an externally validated
+#	username:password pair is valid for - in other words how
+#	often the helper program is called for that user. Set this
+#	low to force revalidation with short lived passwords.  Note
+#	setting this high does not impact your susceptibility
+#	to replay attacks unless you are using an one-time password
+#	system (such as SecureID).  If you are using such a system,
+#	you will be vulnerable to replay attacks unless you also
+#	use the max_user_ip ACL in an http_access rule.
+#
+#	"casesensitive" on|off
+#	Specifies if usernames are case sensitive. Most user databases are
+#	case insensitive allowing the same username to be spelled using both
+#	lower and upper case letters, but some are case sensitive. This
+#	makes a big difference for user_max_ip ACL processing and similar.
+#	auth_param basic casesensitive off
+#
+#	=== Parameters for the digest scheme follow ===
+#
+#	"program" cmdline
+#	Specify the command for the external authenticator.  Such
+#	a program reads a line containing "username":"realm" and
+#	replies with the appropriate H(A1) value hex encoded or
+#	ERR if the user (or his H(A1) hash) does not exists.
+#	See rfc 2616 for the definition of H(A1).
+#	"ERR" responses may optionally be followed by a error description
+#	available as %m in the returned error page.
+#
+#	By default, the digest authentication scheme is not used unless a
+#	program is specified.
+#
+#	If you want to use a digest authenticator, set this line to
+#	something like
+#
+#	auth_param digest program /usr/bin/digest_auth_pw /usr/etc/digpass
+#
+#	"children" numberofchildren
+#	The number of authenticator processes to spawn (no default).
+#	If you start too few Squid will have to wait for them to
+#	process a backlog of H(A1) calculations, slowing it down.
+#	When the H(A1) calculations are done via a (slow) network
+#	you are likely to need lots of authenticator processes.
+#	auth_param digest children 5
+#
+#	"realm" realmstring
+#	Specifies the realm name which is to be reported to the
+#	client for the digest proxy authentication scheme (part of
+#	the text the user will see when prompted their username and
+#	password). There is no default.
+#	auth_param digest realm Squid proxy-caching web server
+#
+#	"nonce_garbage_interval" timeinterval
+#	Specifies the interval that nonces that have been issued
+#	to client_agent's are checked for validity.
+#
+#	"nonce_max_duration" timeinterval
+#	Specifies the maximum length of time a given nonce will be
+#	valid for.
+#
+#	"nonce_max_count" number
+#	Specifies the maximum number of times a given nonce can be
+#	used.
+#
+#	"nonce_strictness" on|off
+#	Determines if squid requires strict increment-by-1 behavior
+#	for nonce counts, or just incrementing (off - for use when
+#	useragents generate nonce counts that occasionally miss 1
+#	(ie, 1,2,4,6)). Default off.
+#
+#	"check_nonce_count" on|off
+#	This directive if set to off can disable the nonce count check
+#	completely to work around buggy digest qop implementations in
+#	certain mainstream browser versions. Default on to check the
+#	nonce count to protect from authentication replay attacks.
+#
+#	"post_workaround" on|off
+#	This is a workaround to certain buggy browsers who sends
+#	an incorrect request digest in POST requests when reusing
+#	the same nonce as acquired earlier on a GET request.
+#
+#	=== NTLM scheme options follow ===
+#
+#	"program" cmdline
+#	Specify the command for the external NTLM authenticator.
+#	Such a program reads exchanged NTLMSSP packets with
+#	the browser via Squid until authentication is completed.
+#	If you use an NTLM authenticator, make sure you have 1 acl
+#	of type proxy_auth.  By default, the NTLM authenticator_program
+#	is not used.
+#
+#	auth_param ntlm program /usr/bin/ntlm_auth
+#
+#	"children" numberofchildren
+#	The number of authenticator processes to spawn (no default).
+#	If you start too few Squid will have to wait for them to
+#	process a backlog of credential verifications, slowing it
+#	down. When credential verifications are done via a (slow)
+#	network you are likely to need lots of authenticator
+#	processes.
+#
+#	auth_param ntlm children 5
+#
+#	"keep_alive" on|off
+#	If you experience problems with PUT/POST requests when using the
+#	Negotiate authentication scheme then you can try setting this to
+#	off. This will cause Squid to forcibly close the connection on
+#	the initial requests where the browser asks which schemes are
+#	supported by the proxy.
+#
+#	auth_param ntlm keep_alive on
+#
+#	=== Options for configuring the NEGOTIATE auth-scheme follow ===
+#
+#	"program" cmdline
+#	Specify the command for the external Negotiate authenticator.
+#	This protocol is used in Microsoft Active-Directory enabled setups with
+#	the Microsoft Internet Explorer or Mozilla Firefox browsers.
+#	Its main purpose is to exchange credentials with the Squid proxy
+#	using the Kerberos mechanisms.
+#	If you use a Negotiate authenticator, make sure you have at least one acl
+#	of type proxy_auth active.  By default, the negotiate authenticator_program
+#	is not used.
+#	The only supported program for this role is the ntlm_auth
+#	program distributed as part of Samba, version 4 or later.
+#
+#	auth_param negotiate program /usr/bin/ntlm_auth --helper-protocol=gss-spnego
+#
+#	"children" numberofchildren
+#	The number of authenticator processes to spawn (no default).
+#	If you start too few Squid will have to wait for them to
+#	process a backlog of credential verifications, slowing it
+#	down. When crendential verifications are done via a (slow)
+#	network you are likely to need lots of authenticator
+#	processes.
+#	auth_param negotiate children 5
+#
+#	"keep_alive" on|off
+#	If you experience problems with PUT/POST requests when using the
+#	Negotiate authentication scheme then you can try setting this to
+#	off. This will cause Squid to forcibly close the connection on
+#	the initial requests where the browser asks which schemes are
+#	supported by the proxy.
+#
+#	auth_param negotiate keep_alive on
+#
+#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
+
+#  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 acl helper processes spawn to service
+#			external acl lookups of this type. (default 5)
+#	  concurrency=n	concurrency level per process. Only used with helpers
+#			capable of processing more than one query at a time.
+#	  cache=n	result cache size, 0 is unbounded (default)
+#	  grace=n	Percentage remaining of TTL where a refresh of a
+#			cached entry should be initiated without needing to
+#			wait for a new reply. (default 0 for no grace period)
+#	  protocol=2.5	Compatibility mode for Squid-2.5 external acl helpers
+#
+#	FORMAT specifications
+#
+#	  %LOGIN	Authenticated user login name
+#	  %EXT_USER	Username from external acl
+#	  %IDENT	Ident user name
+#	  %SRC		Client IP
+#	  %SRCPORT	Client source port
+#	  %URI		Requested URI
+#	  %DST		Requested host
+#	  %PROTO	Requested protocol
+#	  %PORT		Requested port
+#	  %PATH		Requested URL path
+#	  %METHOD	Request method
+#	  %MYADDR	Squid interface address
+#	  %MYPORT	Squid http_port number
+#	  %PATH		Requested URL-path (including query-string if any)
+#	  %USER_CERT	SSL User certificate in PEM format
+#	  %USER_CERTCHAIN SSL User certificate chain in PEM format
+#	  %USER_CERT_xx	SSL User certificate subject attribute xx
+#	  %USER_CA_xx	SSL User certificate issuer attribute xx
+#	  %{Header}	HTTP request header
+#	  %{Hdr:member}	HTTP request header list member
+#	  %{Hdr:;member}
+#	  		HTTP request header list member using ; as
+#	  		list separator. ; can be any non-alphanumeric
+#			character.
+#
+#	In addition to the above, any string specified in the referencing
+#	acl will also be included in the helper request line, after the
+#	specified formats (see the "acl external" directive)
+#
+#	The helper receives lines per the above format specification,
+#	and returns lines starting with OK or ERR indicating the validity
+#	of the request and optionally followed by additional keywords with
+#	more details.
+#
+#	General result syntax:
+#
+#	  OK/ERR keyword=value ...
+#
+#	Defined keywords:
+#
+#	  user=		The users name (login)
+#	  password=	The users password (for login= cache_peer option)
+#	  message=	Message describing the reason. Available as %o
+#	  		in error pages
+#	  tag=		Apply a tag to a request (for both ERR and OK results)
+#	  		Only sets a tag, does not alter existing tags.
+#	  log=		String to be logged in access.log. Available as
+#	  		%ea in logformat specifications
+#
+#	If protocol=3.0 (the default) then URL escaping is used to protect
+#	each value in both requests and responses.
+#
+#	If using protocol=2.5 then all values need to be enclosed in quotes
+#	if they may contain whitespace, or the whitespace escaped using \.
+#	And quotes or \ characters within the keyword value must be \ escaped.
+#
+#	When using the concurrency= option the protocol is changed by
+#	introducing a query channel tag infront of the request/response.
+#	The query channel tag is a number between 0 and concurrency-1.
+#
+#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, Windows, FreeBSD, and some other *BSD variants.
+#	  #
+#	  # NOTE: Squid can only determine the MAC address for clients that are on
+#	  # the same subnet. If the client is on a different subnet, then Squid cannot
+#	  # find out its MAC address.
+#
+#	acl aclname srcdomain   .foo.com ...    # reverse lookup, client IP
+#	acl aclname dstdomain   .foo.com ...    # Destination server from URL
+#	acl aclname srcdom_regex [-i] xxx ...   # regex matching client name
+#	acl aclname dstdom_regex [-i] xxx ...   # regex matching server
+#	  # For dstdomain and dstdom_regex a reverse lookup is tried if a IP
+#	  # based URL is used and no match is found. The name "none" is used
+#	  # if the reverse lookup fails.
+#
+#	acl aclname http_status 200 301 500- 400-403 ...     # status code in reply
+#
+#	acl aclname time     [day-abbrevs]  [h1:m1-h2:m2]
+#	    day-abbrevs:
+#		S - Sunday
+#		M - Monday
+#		T - Tuesday
+#		W - Wednesday
+#		H - Thursday
+#		F - Friday
+#		A - Saturday
+#	    h1:m1 must be less than h2:m2
+#	acl aclname url_regex [-i] ^http:// ...	# regex matching on whole URL
+#	acl aclname urlpath_regex [-i] \.gif$ ...	# regex matching on URL path
+#	acl aclname port     80 70 21 ...
+#	acl aclname port     0-1024 ...		# ranges allowed
+#	acl aclname myport   3128 ...		# (local socket TCP port)
+#	acl aclname proto    HTTP FTP ...
+#	acl aclname method   GET POST ...
+#	acl aclname browser  [-i] regexp ...
+#	  # pattern match on User-Agent header (see also req_header below)
+#	acl aclname referer_regex  [-i] regexp ...
+#	  # pattern match on Referer header
+#	  # Referer is highly unreliable, so use with care
+#	acl aclname ident    username ...
+#	acl aclname ident_regex [-i] pattern ...
+#	  # string match on ident output.
+#	  # use REQUIRED to accept any non-null ident.
+#	acl aclname src_as   number ...
+#	acl aclname dst_as   number ...
+#	  # Except for access control, AS numbers can be used for
+#	  # routing of requests to specific caches. Here's an
+#	  # example for routing all requests for AS#1241 and only
+#	  # those to mycache.mydomain.net:
+#	  # acl asexample dst_as 1241
+#	  # cache_peer_access mycache.mydomain.net allow asexample
+#	  # cache_peer_access mycache_mydomain.net deny all
+#
+#	acl aclname proxy_auth [-i] username ...
+#	acl aclname proxy_auth_regex [-i] pattern ...
+#	  # list of valid usernames
+#	  # use REQUIRED to accept any valid username.
+#	  #
+#	  # NOTE: when a Proxy-Authentication header is sent but it is not
+#	  # needed during ACL checking the username is NOT logged
+#	  # in access.log.
+#	  #
+#	  # NOTE: proxy_auth requires a EXTERNAL authentication program
+#	  # to check username/password combinations (see
+#	  # auth_param directive).
+#	  #
+#	  # NOTE: proxy_auth can't be used in a transparent proxy as
+#	  # the browser needs to be configured for using a proxy in order
+#	  # to respond to proxy authentication.
+#
+#	acl aclname snmp_community string ...
+#	  # A community string to limit access to your SNMP Agent
+#	  # Example:
+#	  #
+#	  #	acl snmppublic snmp_community public
+#
+#	acl aclname maxconn number
+#	  # This will be matched when the client's IP address has
+#	  # more than <number> HTTP connections established.
+#
+#	acl aclname max_user_ip [-s] number
+#	  # This will be matched when the user attempts to log in from more
+#	  # than <number> different ip addresses. The authenticate_ip_ttl
+#	  # parameter controls the timeout on the ip entries.
+#	  # If -s is specified the limit is strict, denying browsing
+#	  # from any further IP addresses until the ttl has expired. Without
+#	  # -s Squid will just annoy the user by "randomly" denying requests.
+#	  # (the counter is reset each time the limit is reached and a
+#	  # request is denied)
+#	  # NOTE: in acceleration mode or where there is mesh of child proxies,
+#	  # clients may appear to come from multiple addresses if they are
+#	  # going through proxy farms, so a limit of 1 may cause user problems.
+#
+#	acl aclname req_mime_type mime-type1 ...
+#	  # regex match against the mime type of the request generated
+#	  # by the client. Can be used to detect file upload or some
+#	  # types HTTP tunneling requests.
+#	  # NOTE: This does NOT match the reply. You cannot use this
+#	  # to match the returned file type.
+#
+#	acl aclname req_header header-name [-i] any\.regex\.here
+#	  # regex match against any of the known request headers.  May be
+#	  # thought of as a superset of "browser", "referer" and "mime-type"
+#	  # ACLs.
+#
+#	acl aclname rep_mime_type mime-type1 ...
+#	  # regex match against the mime type of the reply received by
+#	  # squid. Can be used to detect file download or some
+#	  # types HTTP tunneling requests.
+#	  # NOTE: This has no effect in http_access rules. It only has
+#	  # effect in rules that affect the reply data stream such as
+#	  # http_reply_access.
+#
+#	acl aclname rep_header header-name [-i] any\.regex\.here
+#	  # regex match against any of the known reply headers. May be
+#	  # thought of as a superset of "browser", "referer" and "mime-type"
+#	  # ACLs.
+#
+#	acl acl_name external class_name [arguments...]
+#	  # external ACL lookup via a helper class defined by the
+#	  # external_acl_type directive.
+#
+#	acl aclname user_cert attribute values...
+#	  # match against attributes in a user SSL certificate
+#	  # attribute is one of DN/C/O/CN/L/ST
+#
+#	acl aclname ca_cert attribute values...
+#	  # match against attributes a users issuing CA SSL certificate
+#	  # attribute is one of DN/C/O/CN/L/ST
+#
+#	acl aclname ext_user username ...
+#	acl aclname ext_user_regex [-i] pattern ...
+#	  # string match on username returned by external acl helper
+#	  # use REQUIRED to accept any non-null user name.
+#
+#Examples:
+#acl macaddress arp 09:00:2b:23:45:67
+#acl myexample dst_as 1241
+#acl password proxy_auth REQUIRED
+#acl fileupload req_mime_type -i ^multipart/form-data$
+#acl javascript rep_mime_type -i ^application/x-javascript$
+#
+#Default:
+# acl all src all
+#
+#Recommended minimum configuration:
+acl manager proto cache_object
+acl localhost src 127.0.0.1/32
+acl to_localhost dst 127.0.0.0/8
+#
+# Example rule allowing access from your local networks.
+# Adapt to list your (internal) IP networks from where browsing
+# should be allowed
+acl localnet src 10.0.0.0/8	# RFC1918 possible internal network
+acl localnet src 172.16.0.0/12	# RFC1918 possible internal network
+acl localnet src 192.168.0.0/16	# RFC1918 possible internal network
+#
+acl SSL_ports port 443
+acl Safe_ports port 80		# http
+acl Safe_ports port 21		# ftp
+acl Safe_ports port 443		# https
+acl Safe_ports port 70		# gopher
+acl Safe_ports port 210		# wais
+acl Safe_ports port 1025-65535	# unregistered ports
+acl Safe_ports port 280		# http-mgmt
+acl Safe_ports port 488		# gss-http
+acl Safe_ports port 591		# filemaker
+acl Safe_ports port 777		# multiling http
+acl CONNECT method CONNECT
+
+#  TAG: http_access
+#	Allowing or Denying access based on defined access lists
+#
+#	Access to the HTTP port:
+#	http_access allow|deny [!]aclname ...
+#
+#	NOTE on default values:
+#
+#	If there are no "access" lines present, the default is to deny
+#	the request.
+#
+#	If none of the "access" lines cause a match, the default is the
+#	opposite of the last line in the list.  If the last line was
+#	deny, the default is allow.  Conversely, if the last line
+#	is allow, the default will be deny.  For these reasons, it is a
+#	good idea to have an "deny all" or "allow all" entry at the end
+#	of your access lists to avoid potential confusion.
+#
+#Default:
+# http_access deny all
+#
+#Recommended minimum configuration:
+#
+# Only allow cachemgr access from localhost
+http_access allow manager localhost
+http_access deny manager
+# Deny requests to unknown ports
+http_access deny !Safe_ports
+# Deny CONNECT to other than SSL ports
+http_access deny CONNECT !SSL_ports
+#
+# We strongly recommend the following be uncommented to protect innocent
+# web applications running on the proxy server who think the only
+# one who can access services on "localhost" is a local user
+#http_access deny to_localhost
+#
+# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
+
+# Example rule allowing access from your local networks.
+# Adapt localnet in the ACL section to list your (internal) IP networks
+# from where browsing should be allowed
+http_access allow localnet
+
+# And finally deny all other access to this proxy
+http_access deny all
+
+#  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:
+# none
+
+#  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 local networks only
+icp_access allow localnet
+icp_access deny 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.
+#
+#Default:
+# htcp_access deny all
+#
+#Allow HTCP queries from local networks only
+htcp_access allow localnet
+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
+#	(RFC 931) lookup to be performed for this request.  For
+#	example, you might choose to always perform ident lookups
+#	for your main multi-user Unix boxes, but not for your Macs
+#	and PCs.  By default, ident lookups are not performed for
+#	any requests.
+#
+#	To enable ident lookups for specific client addresses, you
+#	can follow this example:
+#
+#	acl ident_aware_hosts src 198.168.1.0/255.255.255.0
+#	ident_lookup_access allow ident_aware_hosts
+#	ident_lookup_access deny all
+#
+#	Only src type ACL checks are fully supported.  A src_domain
+#	ACL might work at times, but it will not always provide
+#	the correct result.
+#
+#Default:
+# ident_lookup_access deny all
+
+#  TAG: reply_body_max_size	size [acl acl...]
+#	This option specifies the maximum size of a reply body. It can be
+#	used to prevent users from downloading very large files, such as
+#	MP3's and movies. When the reply headers are received, the
+#	reply_body_max_size lines are processed, and the first line where
+#	all (if any) listed ACLs are true is used as the maximum body size
+#	for this reply.
+#
+#	This size is checked twice. First when we get the reply headers,
+#	we check the content-length value.  If the content length value exists
+#	and is larger than the allowed size, the request is denied and the
+#	user receives an error message that says "the request or reply
+#	is too large." If there is no content-length, and the reply
+#	size exceeds this limit, the client's connection is just closed
+#	and they will receive a partial reply.
+#
+#	WARNING: downstream caches probably can not detect a partial reply
+#	if there is no content-length header, so they will cache
+#	partial responses and give them out as hits.  You should NOT
+#	use this option if you have downstream caches.
+#
+#	WARNING: A maximum size smaller than the size of squid's error messages
+#	will cause an infinite loop and crash squid. Ensure that the smallest
+#	non-zero value you use is greater that the maximum header size plus
+#	the size of your largest error page.
+#
+#	If you set this parameter none (the default), there will be
+#	no limit imposed.
+#
+#Default:
+# none
+
+
+# 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.
+#
+#	The -a command line option may be used to specify additional
+#	port(s) where Squid listens for proxy request. Such ports will
+#	be plain proxy ports with no options.
+#
+#	You may specify multiple socket addresses on multiple lines.
+#
+#	Options:
+#
+#	   transparent	Support for transparent interception of
+#			outgoing requests without browser settings.
+#
+#	   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.
+#
+#	   protocol=	Protocol to reconstruct accelerated requests with.
+#			Defaults to http.
+#
+#	   disable-pmtu-discovery=
+#			Control Path-MTU discovery usage:
+#			    off		lets OS decide on what to do (default).
+#			    transparent	disable PMTU discovery when transparent
+#					support is enabled.
+#			    always	disable always PMTU discovery.
+#
+#			In many setups of transparently intercepting proxies
+#			Path-MTU discovery can not work on traffic towards the
+#			clients. This is the case when the intercepting device
+#			does not fully track connections and fails to forward
+#			ICMP must fragment messages to the cache server. If you
+#			have such setup and experience that certain clients
+#			sporadically hang or never complete requests set
+#			disable-pmtu-discovery option to 'transparent'.
+#
+#	If you run Squid on a dual-homed machine with an internal
+#	and an external interface we recommend you to specify the
+#	internal address:port in http_port. This way Squid will only be
+#	visible on the internal address.
+#
+# Squid normally listens to port 3128
+http_port 3128
+
+#  TAG: https_port
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-ssl option
+#
+#	Usage:  [ip:]port cert=certificate.pem [key=key.pem] [options...]
+#
+#	The socket address where Squid will listen for HTTPS client
+#	requests.
+#
+#	This is really only useful for situations where you are running
+#	squid in accelerator mode and you want to do the SSL work at the
+#	accelerator level.
+#
+#	You may specify multiple socket addresses on multiple lines,
+#	each with their own SSL certificate and/or options.
+#
+#	Options:
+#
+#	   accel	Accelerator mode. Also needs at least one of
+#			defaultsite or vhost.
+#
+#	   defaultsite=	The name of the https site presented on
+#	   		this port. Implies accel.
+#
+#	   vhost	Accelerator mode using Host header for virtual
+#			domain support. Requires a wildcard certificate
+#			or other certificate valid for more than one domain.
+#			Implies accel.
+#
+#	   protocol=	Protocol to reconstruct accelerated requests with.
+#			Defaults to https.
+#
+#	   cert=	Path to SSL certificate (PEM format).
+#
+#	   key=		Path to SSL private key file (PEM format)
+#			if not specified, the certificate file is
+#			assumed to be a combined certificate and
+#			key file.
+#
+#	   version=	The version of SSL/TLS supported
+#			    1	automatic (default)
+#			    2	SSLv2 only
+#			    3	SSLv3 only
+#			    4	TLSv1 only
+#
+#	   cipher=	Colon separated list of supported ciphers.
+#
+#	   options=	Various SSL engine options. The most important
+#			being:
+#			    NO_SSLv2  Disallow the use of SSLv2
+#			    NO_SSLv3  Disallow the use of SSLv3
+#			    NO_TLSv1  Disallow the use of TLSv1
+#			    SINGLE_DH_USE Always create a new key when using
+#				      temporary/ephemeral DH key exchanges
+#			See src/ssl_support.c or OpenSSL SSL_CTX_set_options
+#			documentation for a complete list of options.
+#
+#	   clientca=	File containing the list of CAs to use when
+#			requesting a client certificate.
+#
+#	   cafile=	File containing additional CA certificates to
+#			use when verifying client certificates. If unset
+#			clientca will be used.
+#
+#	   capath=	Directory containing additional CA certificates
+#			and CRL lists to use when verifying client certificates.
+#
+#	   crlfile=	File of additional CRL lists to use when verifying
+#			the client certificate, in addition to CRLs stored in
+#			the capath. Implies VERIFY_CRL flag below.
+#
+#	   dhparams=	File containing DH parameters for temporary/ephemeral
+#			DH key exchanges.
+#
+#	   sslflags=	Various flags modifying the use of SSL:
+#			    DELAYED_AUTH
+#				Don't request client certificates
+#				immediately, but wait until acl processing
+#				requires a certificate (not yet implemented).
+#			    NO_DEFAULT_CA
+#				Don't use the default CA lists built in
+#				to OpenSSL.
+#			    NO_SESSION_REUSE
+#				Don't allow for session reuse. Each connection
+#				will result in a new SSL session.
+#			    VERIFY_CRL
+#				Verify CRL lists when accepting client
+#				certificates.
+#			    VERIFY_CRL_ALL
+#				Verify CRL lists for all certificates in the
+#				client certificate chain.
+#
+#	   sslcontext=	SSL session ID context identifier.
+#
+#	   vport	Accelerator with IP based virtual host support.
+#
+#	   vport=NN	As above, but uses specified port number rather
+#			than the https_port number. Implies accel.
+#
+#
+#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 normal_service_net uses 0x20
+#
+#	acl normal_service_net src 10.0.0.0/255.255.255.0
+#	acl good_service_net src 10.0.1.0/255.255.255.0
+#	tcp_outgoing_tos 0x00 normal_service_net
+#	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: clientside_tos
+#	Allows you to select a TOS/Diffserv value to mark client-side
+#	connections with, based on the username or source address
+#	making the request.
+#
+#Default:
+# none
+
+#  TAG: tcp_outgoing_address
+#	Allows you to map requests to different outgoing IP addresses
+#	based on the username or source address of the user making
+#	the request.
+#
+#	tcp_outgoing_address ipaddr [[!]aclname] ...
+#
+#	Example where requests from 10.0.0.0/24 will be forwarded
+#	with source address 10.1.0.1, 10.0.2.0/24 forwarded with
+#	source address 10.1.0.2 and the rest will be forwarded with
+#	source address 10.1.0.3.
+#
+#	acl normal_service_net src 10.0.0.0/255.255.255.0
+#	acl good_service_net src 10.0.1.0/255.255.255.0
+#	tcp_outgoing_address 10.0.0.1 normal_service_net
+#	tcp_outgoing_address 10.0.0.2 good_service_net
+#	tcp_outgoing_address 10.0.0.3
+#
+#	Processing proceeds in the order specified, and stops at first fully
+#	matching line.
+#
+#	Note: The use of this directive using client dependent ACLs is
+#	incompatible with the use of server side persistent connections. To
+#	ensure correct results it is best to set server_persistent_connections
+#	to off when using this directive in such configurations.
+#
+#Default:
+# none
+
+
+# SSL OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: ssl_unclean_shutdown
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-ssl option
+#
+#	Some browsers (especially MSIE) bugs out on SSL shutdown
+#	messages.
+#
+#Default:
+# ssl_unclean_shutdown off
+
+#  TAG: ssl_engine
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-ssl option
+#
+#	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
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-ssl option
+#
+#	Client SSL Certificate to use when proxying https:// URLs
+#
+#Default:
+# none
+
+#  TAG: sslproxy_client_key
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-ssl option
+#
+#	Client SSL Key to use when proxying https:// URLs
+#
+#Default:
+# none
+
+#  TAG: sslproxy_version
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-ssl option
+#
+#	SSL version level to use when proxying https:// URLs
+#
+#Default:
+# sslproxy_version 1
+
+#  TAG: sslproxy_options
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-ssl option
+#
+#	SSL engine options to use when proxying https:// URLs
+#
+#Default:
+# none
+
+#  TAG: sslproxy_cipher
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-ssl option
+#
+#	SSL cipher list to use when proxying https:// URLs
+#
+#Default:
+# none
+
+#  TAG: sslproxy_cafile
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-ssl option
+#
+#	file containing CA certificates to use when verifying server
+#	certificates while proxying https:// URLs
+#
+#Default:
+# none
+
+#  TAG: sslproxy_capath
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-ssl option
+#
+#	directory containing CA certificates to use when verifying
+#	server certificates while proxying https:// URLs
+#
+#Default:
+# none
+
+#  TAG: sslproxy_flags
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-ssl option
+#
+#	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
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-ssl option
+#
+#	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
+#		     basetime=n
+#		     ttl=n
+#		     no-query
+#		     background-ping
+#		     default
+#		     round-robin
+#		     weighted-round-robin
+#		     carp
+#		     multicast-responder
+#		     closest-only
+#		     no-digest
+#		     no-netdb-exchange
+#		     no-delay
+#		     login=user:password | PASS | *:password
+#		     connect-timeout=nn
+#		     digest-url=url
+#		     allow-miss
+#		     max-conn=n
+#		     htcp
+#		     htcp-oldsquid
+#		     originserver
+#		     name=xxx
+#		     forceddomain=name
+#		     ssl
+#		     sslcert=/path/to/ssl/certificate
+#		     sslkey=/path/to/ssl/key
+#		     sslversion=1|2|3|4
+#		     sslcipher=...
+#		     ssloptions=...
+#		     front-end-https[=on|auto]
+#
+#		     use 'proxy-only' to specify objects fetched
+#		     from this cache should not be saved locally.
+#
+#		     use 'weight=n' to affect the selection of a peer
+#		     during any weighted peer-selection mechanisms.
+#		     The weight must be an integer; default is 1,
+#		     larger weights are favored more.
+#		     This option does not affect parent selection if a peering
+#		     protocol is not in use.
+#
+#		     use 'basetime=n' to specify a base amount to
+#		     be subtracted from round trip times of parents.
+#		     It is subtracted before division by weight in calculating
+#		     which parent to fectch from. If the rtt is less than the
+#		     base time the rtt is set to a minimal value.
+#
+#		     use 'ttl=n' to specify a IP multicast TTL to use
+#		     when sending an ICP queries to this address.
+#		     Only useful when sending to a multicast group.
+#		     Because we don't accept ICP replies from random
+#		     hosts, you must configure other group members as
+#		     peers with the 'multicast-responder' option below.
+#
+#		     use 'no-query' to NOT send ICP queries to this
+#		     neighbor.
+#
+#		     use 'background-ping' to only send ICP queries to this
+#		     neighbor infrequently. This is used to keep the neighbor
+#		     round trip time updated and is usually used in
+#		     conjunction with weighted-round-robin.
+#
+#		     use 'default' if this is a parent cache which can
+#		     be used as a "last-resort" if a peer cannot be located
+#		     by any of the peer-selection mechanisms.
+#		     If specified more than once, only the first is used.
+#
+#		     use 'round-robin' to define a set of parents which
+#		     should be used in a round-robin fashion in the
+#		     absence of any ICP queries.
+#
+#		     use 'weighted-round-robin' to define a set of parents
+#		     which should be used in a round-robin fashion with the
+#		     frequency of each parent being based on the round trip
+#		     time. Closer parents are used more often.
+#		     Usually used for background-ping parents.
+#
+#		     use 'carp' to define a set of parents which should
+#		     be used as a CARP array. The requests will be
+#		     distributed among the parents based on the CARP load
+#		     balancing hash function based on their 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.
+#		     This only works for the Basic HTTP authentication scheme.
+#		     Note: To combine this with proxy_auth both proxies must
+#		     share the same user database as HTTP only allows for
+#		     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 set htcp_access expicitly. The default of
+#		     deny all will prevent peer traffic.
+#
+#		     use 'htcp-oldsquid' to send HTCP to old Squid versions
+#		     You MUST also set htcp_access expicitly. The default of
+#		     deny all will prevent peer traffic.		     
+#
+#		     'originserver' causes this parent peer to be contacted as
+#		     a origin server. Meant to be used in accelerator setups.
+#
+#		     use 'name=xxx' if you have multiple peers on the same
+#		     host but different ports. This name can be used to
+#		     differentiate the peers in cache_peer_access and similar
+#		     directives.
+#
+#		     use 'forceddomain=name' to forcibly set the Host header
+#		     of requests forwarded to this peer. Useful in accelerator
+#		     setups where the server (peer) expects a certain domain
+#		     name and using redirectors to feed this 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.
+#			DONT_VERIFY_DOMAIN
+#				Don't verify the peer certificate
+#				matches the server name
+#
+#		     use ssldomain= to specify the peer name as advertised
+#		     in it's certificate. Used for verifying the correctness
+#		     of the received peer certificate. If not specified the
+#		     peer hostname will be used.
+#
+#		     use front-end-https to enable the "Front-End-Https: On"
+#		     header needed when using Squid as a SSL frontend 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.
+#
+#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 domainname
+#	with '!' means the cache will be queried for objects
+#	NOT in that domain.
+#
+#	NOTE:	* Any number of domains may be given for a cache-host,
+#		  either on the same or separate lines.
+#		* When multiple domains are given for a particular
+#		  cache-host, the first matched domain is applied.
+#		* Cache hosts with no domain restrictions are queried
+#		  for all requests.
+#		* There are no defaults.
+#		* There is also a 'cache_peer_access' tag in the ACL
+#		  section.
+#
+#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.
+#
+#	The ufs store type:
+#
+#	"ufs" is the old well-known Squid storage format that has always
+#	been there.
+#
+#	cache_dir ufs Directory-Name Mbytes L1 L2 [options]
+#
+#	'Mbytes' is the amount of disk space (MB) to use under this
+#	directory.  The default is 100 MB.  Change this to suit your
+#	configuration.  Do NOT put the size of your disk drive here.
+#	Instead, if you want Squid to use the entire disk drive,
+#	subtract 20% and use that value.
+#
+#	'Level-1' is the number of first-level subdirectories which
+#	will be created under the 'Directory'.  The default is 16.
+#
+#	'Level-2' is the number of second-level subdirectories which
+#	will be created under each first-level directory.  The default
+#	is 256.
+#
+#	The aufs store type:
+#
+#	"aufs" uses the same storage format as "ufs", utilizing
+#	POSIX-threads to avoid blocking the main Squid process on
+#	disk-I/O. This was formerly known in Squid as async-io.
+#
+#	cache_dir aufs Directory-Name Mbytes L1 L2 [options]
+#
+#	see argument descriptions under ufs above
+#
+#	The diskd store type:
+#
+#	"diskd" uses the same storage format as "ufs", utilizing a
+#	separate process to avoid blocking the main Squid process on
+#	disk-I/O.
+#
+#	cache_dir diskd Directory-Name Mbytes L1 L2 [options] [Q1=n] [Q2=n]
+#
+#	see argument descriptions under ufs above
+#
+#	Q1 specifies the number of unacknowledged I/O requests when Squid
+#	stops opening new files. If this many messages are in the queues,
+#	Squid won't open new files. Default is 64
+#
+#	Q2 specifies the number of unacknowledged messages when Squid
+#	starts blocking.  If this many messages are in the queues,
+#	Squid blocks until it receives some replies. Default is 72
+#
+#	When Q1 < Q2 (the default), the cache directory is optimized
+#	for lower response time at the expense of a decrease in hit
+#	ratio.  If Q1 > Q2, the cache directory is optimized for
+#	higher hit ratio at the expense of an increase in response
+#	time.
+#
+#	The coss store type:
+#
+#	block-size=n defines the "block size" for COSS cache_dir's.
+#	Squid uses file numbers as block numbers.  Since file numbers
+#	are limited to 24 bits, the block size determines the maximum
+#	size of the COSS partition.  The default is 512 bytes, which
+#	leads to a maximum cache_dir size of 512<<24, or 8 GB.  Note
+#	you should not change the coss block size after Squid
+#	has written some objects to the cache_dir.
+#
+#	The coss file store has changed from 2.5. Now it uses a file
+#	called 'stripe' in the directory names in the config - and
+#	this will be created by squid -z.
+#
+#	The null store type:
+#
+#	no options are allowed or required
+#
+#	Common options:
+#
+#	no-store, no new objects should be stored to this cache_dir
+#
+#	max-size=n, refers to the max object size this storedir supports.
+#	It is used to initially choose the storedir to dump the object.
+#	Note: To make optimal use of the max-size limits you should order
+#	the cache_dir lines with the smallest max-size value first and the
+#	ones with no max-size specification last.
+#
+#	Note for coss, max-size must be less than COSS_MEMBUF_SZ,
+#	which can be changed with the --with-coss-membuf-size=N configure
+#	option.
+#
+#Default:
+cache_dir ufs /var/cache/squid/ 100 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 4096 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
+#		rp	Request URL-Path excluding hostname
+#		rv	Request protocol version
+#		et	Tag returned by external acl
+#		ea	Log string returned by external acl
+#		<st	Reply size including HTTP headers
+#		<sH	Reply high offset sent
+#		<sS	Upstream object size
+#		%	a literal % character
+#
+#logformat squid  %ts.%03tu %6tr %>a %Ss/%03Hs %<st %rm %ru %un %Sh/%<A %mt
+#logformat squidmime  %ts.%03tu %6tr %>a %Ss/%03Hs %<st %rm %ru %un %Sh/%<A %mt [%>h] [%<h]
+#logformat common %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %Hs %<st %Ss:%Sh
+#logformat combined %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %Hs %<st "%{Referer}>h" "%{User-Agent}>h" %Ss:%Sh
+#
+#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.
+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>'.
+#
+#Default:
+# logfile_rotate 10
+
+#  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
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-useragent-log option
+#
+#	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
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-referer-log option
+#
+#	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/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
+# Note: This option is only available if Squid is rebuilt with the
+#       -DWIP_FWD_LOG define
+#
+#	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/libexec/diskd
+
+#  TAG: unlinkd_program
+#	Specify the location of the executable for file deletion process.
+#
+#Default:
+# unlinkd_program /usr/libexec/unlinkd
+
+#  TAG: pinger_program
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-icmp option
+#
+#	Specify the location of the executable for the pinger process.
+#
+#Default:
+# pinger_program /usr/libexec/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> kvpairs]<NL>
+#
+#	In the future, the rewriter interface will be extended with
+#	key=value pairs ("kvpairs" shown above).  Rewriter programs
+#	should be prepared to receive and possibly ignore additional
+#	whitespace-separated tokens on each input line.
+#
+#	And the rewriter may return a rewritten URL. The other components of
+#	the request line does not need to be returned (ignored if they are).
+#
+#	The rewriter can also indicate that a client-side redirect should
+#	be performed to the new URL. This is done by prefixing the returned
+#	URL with "301:" (moved permanently) or 302: (moved temporarily).
+#
+#	By default, a URL rewriter is not used.
+#
+#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.
+#
+#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: url_rewrite_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:
+# url_rewrite_bypass off
+
+
+# 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-no-store
+#		 ignore-private
+#		 ignore-auth
+#		 refresh-ims
+#
+#		override-expire enforces min age even if the server
+#		sent a Expires: header. Doing this VIOLATES the HTTP
+#		standard.  Enabling this feature could make you liable
+#		for problems which it causes.
+#
+#		override-lastmod enforces min age even on objects
+#		that were modified recently.
+#
+#		reload-into-ims changes client no-cache or ``reload''
+#		to If-Modified-Since requests. Doing this VIOLATES the
+#		HTTP standard. Enabling this feature could make you
+#		liable for problems which it causes.
+#
+#		ignore-reload ignores a client no-cache or ``reload''
+#		header. Doing this VIOLATES the HTTP standard. Enabling
+#		this feature could make you liable for problems which
+#		it causes.
+#
+#		ignore-no-cache ignores any ``Pragma: no-cache'' and
+#		``Cache-control: no-cache'' headers received from a server.
+#		The HTTP RFC never allows the use of this (Pragma) header
+#		from a server, only a client, though plenty of servers
+#		send it anyway.
+#
+#		ignore-no-store ignores any ``Cache-control: no-store''
+#		headers received from a server. Doing this VIOLATES
+#		the HTTP standard. Enabling this feature could make you
+#		liable for problems which it causes.
+#
+#		ignore-private ignores any ``Cache-control: private''
+#		headers received from a server. Doing this VIOLATES
+#		the HTTP standard. Enabling this feature could make you
+#		liable for problems which it causes.
+#
+#		ignore-auth caches responses to requests with authorization,
+#		as if the originserver had sent ``Cache-control: public''
+#		in the response header. Doing this VIOLATES the HTTP standard.
+#		Enabling this feature could make you liable for problems which
+#		it causes.
+#
+#		refresh-ims causes squid to contact the origin server
+#		when a client issues an If-Modified-Since request. This
+#		ensures that the client will receive an updated version
+#		if one is available.
+#
+#	Basically a cached object is:
+#
+#		FRESH if expires < now, else STALE
+#		STALE if age > max
+#		FRESH if lm-factor < percent, else STALE
+#		FRESH if age < min
+#		else STALE
+#
+#	The refresh_pattern lines are checked in the order listed here.
+#	The first entry which matches is used.  If none of the entries
+#	match the default will be used.
+#
+#	Note, you must uncomment all the default lines if you want
+#	to change one. The default setting is only active if none is
+#	used.
+#
+#Suggested default:
+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 minutes
+
+#  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. In ESI environments
+#	where page fragments often have short lifetimes, this will
+#	often be best set to 0.
+#
+#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	(bytes)
+#	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: 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: request_header_access
+#	Usage: request_header_access header_name allow|deny [!]aclname ...
+#
+#	WARNING: Doing this VIOLATES the HTTP standard.  Enabling
+#	this feature could make you liable for problems which it
+#	causes.
+#
+#	This option replaces the old 'anonymize_headers' and the
+#	older 'http_anonymizer' option with something that is much
+#	more configurable. This new method creates a list of ACLs
+#	for each header, allowing you very fine-tuned header
+#	mangling.
+#
+#	This option only applies to request headers, i.e., from the
+#	client to the server.
+#
+#	You can only specify known headers for the header name.
+#	Other headers are reclassified as 'Other'. You can also
+#	refer to all the headers with 'All'.
+#
+#	For example, to achieve the same behavior as the old
+#	'http_anonymizer standard' option, you should use:
+#
+#		request_header_access From deny all
+#		request_header_access Referer deny all
+#		request_header_access Server deny all
+#		request_header_access User-Agent deny all
+#		request_header_access WWW-Authenticate deny all
+#		request_header_access Link deny all
+#
+#	Or, to reproduce the old 'http_anonymizer paranoid' feature
+#	you should use:
+#
+#		request_header_access Allow allow all
+#		request_header_access Authorization allow all
+#		request_header_access WWW-Authenticate allow all
+#		request_header_access Proxy-Authorization allow all
+#		request_header_access Proxy-Authenticate allow all
+#		request_header_access Cache-Control allow all
+#		request_header_access Content-Encoding allow all
+#		request_header_access Content-Length allow all
+#		request_header_access Content-Type allow all
+#		request_header_access Date allow all
+#		request_header_access Expires allow all
+#		request_header_access Host allow all
+#		request_header_access If-Modified-Since allow all
+#		request_header_access Last-Modified allow all
+#		request_header_access Location allow all
+#		request_header_access Pragma allow all
+#		request_header_access Accept allow all
+#		request_header_access Accept-Charset allow all
+#		request_header_access Accept-Encoding allow all
+#		request_header_access Accept-Language allow all
+#		request_header_access Content-Language allow all
+#		request_header_access Mime-Version allow all
+#		request_header_access Retry-After allow all
+#		request_header_access Title allow all
+#		request_header_access Connection allow all
+#		request_header_access Proxy-Connection allow all
+#		request_header_access All deny all
+#
+#	although many of those are HTTP reply headers, and so should be
+#	controlled with the reply_header_access directive.
+#
+#	By default, all headers are allowed (no anonymizing is
+#	performed).
+#
+#Default:
+# none
+
+#  TAG: reply_header_access
+#	Usage: reply_header_access header_name allow|deny [!]aclname ...
+#
+#	WARNING: Doing this VIOLATES the HTTP standard.  Enabling
+#	this feature could make you liable for problems which it
+#	causes.
+#
+#	This option only applies to reply headers, i.e., from the
+#	server to the client.
+#
+#	This is the same as request_header_access, but in the other
+#	direction.
+#
+#	This option replaces the old 'anonymize_headers' and the
+#	older 'http_anonymizer' option with something that is much
+#	more configurable. This new method creates a list of ACLs
+#	for each header, allowing you very fine-tuned header
+#	mangling.
+#
+#	You can only specify known headers for the header name.
+#	Other headers are reclassified as 'Other'. You can also
+#	refer to all the headers with 'All'.
+#
+#	For example, to achieve the same behavior as the old
+#	'http_anonymizer standard' option, you should use:
+#
+#		reply_header_access From deny all
+#		reply_header_access Referer deny all
+#		reply_header_access Server deny all
+#		reply_header_access User-Agent deny all
+#		reply_header_access WWW-Authenticate deny all
+#		reply_header_access Link deny all
+#
+#	Or, to reproduce the old 'http_anonymizer paranoid' feature
+#	you should use:
+#
+#		reply_header_access Allow allow all
+#		reply_header_access Authorization allow all
+#		reply_header_access WWW-Authenticate allow all
+#		reply_header_access Proxy-Authorization allow all
+#		reply_header_access Proxy-Authenticate allow all
+#		reply_header_access Cache-Control allow all
+#		reply_header_access Content-Encoding allow all
+#		reply_header_access Content-Length allow all
+#		reply_header_access Content-Type allow all
+#		reply_header_access Date allow all
+#		reply_header_access Expires allow all
+#		reply_header_access Host allow all
+#		reply_header_access If-Modified-Since allow all
+#		reply_header_access Last-Modified allow all
+#		reply_header_access Location allow all
+#		reply_header_access Pragma allow all
+#		reply_header_access Accept allow all
+#		reply_header_access Accept-Charset allow all
+#		reply_header_access Accept-Encoding allow all
+#		reply_header_access Accept-Language allow all
+#		reply_header_access Content-Language allow all
+#		reply_header_access Mime-Version allow all
+#		reply_header_access Retry-After allow all
+#		reply_header_access Title allow all
+#		reply_header_access Connection allow all
+#		reply_header_access Proxy-Connection allow all
+#		reply_header_access All deny all
+#
+#	although the HTTP request headers won't be usefully controlled
+#	by this directive -- see request_header_access for details.
+#
+#	By default, all headers are allowed (no anonymizing is
+#	performed).
+#
+#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.
+#
+#	This only applies to request headers, not reply headers.
+#
+#	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 of nobody.
+#	see also; cache_effective_group
+#
+#Default:
+cache_effective_user nobody
+
+#  TAG: 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 groups membership.
+#
+#	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 are 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.
+#
+#	This option is not recommended by the Squid Team.
+#	Our preference is for administrators to configure a secure
+#	user account for squid with UID/GID matching system policies.
+#
+#Default:
+cache_effective_group nobody
+
+#  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
+
+
+# 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_surrogate_id
+# Note: This option is only available if Squid is rebuilt with the
+#       -DUSE_SQUID_ESI define
+#
+#	Surrogates (http://www.esi.org/architecture_spec_1.0.html)
+#	need an identification token to allow control targeting. Because
+#	a farm of surrogates may all perform the same tasks, they may share
+#	an identification token.
+#
+#Default:
+# httpd_accel_surrogate_id unset-id
+
+#  TAG: http_accel_surrogate_remote	on|off
+# Note: This option is only available if Squid is rebuilt with the
+#       -DUSE_SQUID_ESI define
+#
+#	Remote surrogates (such as those in a CDN) honour Surrogate-Control: no-store-remote.
+#	Set this to on to have squid behave as a remote surrogate.
+#
+#Default:
+# http_accel_surrogate_remote off
+
+#  TAG: esi_parser	libxml2|expat|custom
+# Note: This option is only available if Squid is rebuilt with the
+#       -DUSE_SQUID_ESI define
+#
+#	ESI markup is not strictly XML compatible. The custom ESI parser
+#	will give higher performance, but cannot handle non ASCII character
+#	encodings.
+#
+#Default:
+# esi_parser custom
+
+
+# DELAY POOL PARAMETERS
+# -----------------------------------------------------------------------------
+
+#  TAG: delay_pools
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-delay-pools option
+#
+#	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
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-delay-pools option
+#
+#	This defines the class of each delay pool.  There must be exactly one
+#	delay_class line for each delay pool.  For example, to define two
+#	delay pools, one of class 2 and one of class 3, the settings above
+#	and here would be:
+#
+#Example:
+# delay_pools 4      # 4 delay pools
+# delay_class 1 2    # pool 1 is a class 2 pool
+# delay_class 2 3    # pool 2 is a class 3 pool
+# delay_class 3 4    # pool 3 is a class 4 pool
+# delay_class 4 5    # pool 4 is a class 5 pool
+#
+#	The delay pool classes are:
+#
+#		class 1		Everything is limited by a single aggregate
+#				bucket.
+#
+#		class 2 	Everything is limited by a single aggregate
+#				bucket as well as an "individual" bucket chosen
+#				from bits 25 through 32 of the IP address.
+#
+#		class 3		Everything is limited by a single aggregate
+#				bucket as well as a "network" bucket chosen
+#				from bits 17 through 24 of the IP address and a
+#				"individual" bucket chosen from bits 17 through
+#				32 of the IP address.
+#
+#		class 4		Everything in a class 3 delay pool, with an
+#				additional limit on a per user basis. This
+#				only takes effect if the username is established
+#				in advance - by forcing authentication in your
+#				http_access rules.
+#
+#		class 5		Requests are grouped according their tag (see
+#				external_acl's tag= reply).
+#
+#	NOTE: If an IP address is a.b.c.d
+#		-> bits 25 through 32 are "d"
+#		-> bits 17 through 24 are "c"
+#		-> bits 17 through 32 are "c * 256 + d"
+#
+#Default:
+# none
+
+#  TAG: delay_access
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-delay-pools option
+#
+#	This is used to determine which delay pool a request falls into.
+#
+#	delay_access is sorted per pool and the matching starts with pool 1,
+#	then pool 2, ..., and finally pool N. The first delay pool where the
+#	request is allowed is selected for the request. If it does not allow
+#	the request to any pool then the request is not delayed (default).
+#
+#	For example, if you want some_big_clients in delay
+#	pool 1 and lotsa_little_clients in delay pool 2:
+#
+#Example:
+# delay_access 1 allow some_big_clients
+# delay_access 1 deny all
+# delay_access 2 allow lotsa_little_clients
+# delay_access 2 deny all
+# delay_access 3 allow authenticated_clients
+#
+#Default:
+# none
+
+#  TAG: delay_parameters
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-delay-pools option
+#
+#	This defines the parameters for a delay pool.  Each delay pool has
+#	a number of "buckets" associated with it, as explained in the
+#	description of delay_class.  For a class 1 delay pool, the syntax is:
+#
+#delay_parameters pool aggregate
+#
+#	For a class 2 delay pool:
+#
+#delay_parameters pool aggregate individual
+#
+#	For a class 3 delay pool:
+#
+#delay_parameters pool aggregate network individual
+#
+#	For a class 4 delay pool:
+#
+#delay_parameters pool aggregate network individual user
+#
+#	For a class 5 delay pool:
+#
+#delay_parameters pool tag
+#
+#	The variables here are:
+#
+#		pool		a pool number - ie, a number between 1 and the
+#				number specified in delay_pools as used in
+#				delay_class lines.
+#
+#		aggregate	the "delay parameters" for the aggregate bucket
+#				(class 1, 2, 3).
+#
+#		individual	the "delay parameters" for the individual
+#				buckets (class 2, 3).
+#
+#		network		the "delay parameters" for the network buckets
+#				(class 3).
+#
+#		user		the delay parameters for the user buckets
+#				(class 4).
+#
+#		tag		the delay parameters for the tag buckets
+#				(class 5).
+#
+#	A pair of delay parameters is written restore/maximum, where restore is
+#	the number of bytes (not bits - modem and network speeds are usually
+#	quoted in bits) per second placed into the bucket, and maximum is the
+#	maximum number of bytes which can be in the bucket at any time.
+#
+#	For example, if delay pool number 1 is a class 2 delay pool as in the
+#	above example, and is being used to strictly limit each host to 64kbps
+#	(plus overheads), with no overall limit, the line is:
+#
+#delay_parameters 1 -1/-1 8000/8000
+#
+#	Note that the figure -1 is used to represent "unlimited".
+#
+#	And, if delay pool number 2 is a class 3 delay pool as in the above
+#	example, and you want to limit it to a total of 256kbps (strict limit)
+#	with each 8-bit network permitted 64kbps (strict limit) and each
+#	individual host permitted 4800bps with a bucket maximum size of 64kb
+#	to permit a decent web page to be downloaded at a decent speed
+#	(if the network is not being limited due to overuse) but slow down
+#	large downloads more significantly:
+#
+#delay_parameters 2 32000/32000 8000/8000 600/8000
+#
+#	There must be one delay_parameters line for each delay pool.
+#
+#	Finally, for a class 4 delay pool as in the example - each user will
+#	be limited to 128Kb no matter how many workstations they are logged into.:
+#
+#delay_parameters 4 32000/32000 8000/8000 600/64000 16000/16000
+#
+#Default:
+# none
+
+#  TAG: delay_initial_bucket_level	(percent, 0-100)
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-delay-pools option
+#
+#	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, dest_port_hash
+#	+ src_ip_alt_hash, dst_ip_alt_hash
+#	+ src_port_alt_hash, dst_port_alt_hash
+#	+ ports_source
+#
+#	The port list can be one to eight entries.
+#
+#	Example:
+#
+#	wccp2_service_info 80 protocol=tcp flags=src_ip_hash,ports_source
+#	    priority=240 ports=80
+#
+#	Note: the service id must have been defined by a previous
+#	'wccp2_service dynamic <id>' entry.
+#
+#Default:
+# none
+
+#  TAG: wccp2_weight
+#	Each cache server gets assigned a set of the destination
+#	hash proportional to their weight.
+#
+#Default:
+# wccp2_weight 10000
+
+#  TAG: wccp_address
+#  TAG: wccp2_address
+#	Use this option if you require WCCP to use a specific
+#	interface address.
+#
+#	The default behavior is to not bind to any specific address.
+#
+#Default:
+# wccp_address 0.0.0.0
+# wccp2_address 0.0.0.0
+
+
+# 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
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-cache-digests option
+#
+#	This controls whether the server will generate a Cache Digest
+#	of its contents.  By default, Cache Digest generation is
+#	enabled if Squid is compiled with --enable-cache-digests defined.
+#
+#Default:
+# digest_generation on
+
+#  TAG: digest_bits_per_entry
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-cache-digests option
+#
+#	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)
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-cache-digests option
+#
+#	This is the wait time between Cache Digest rebuilds.
+#
+#Default:
+# digest_rebuild_period 1 hour
+
+#  TAG: digest_rewrite_period	(seconds)
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-cache-digests option
+#
+#	This is the wait time between Cache Digest writes to
+#	disk.
+#
+#Default:
+# digest_rewrite_period 1 hour
+
+#  TAG: digest_swapout_chunk_size	(bytes)
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-cache-digests option
+#
+#	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)
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-cache-digests option
+#
+#	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
+#	The port number where Squid listens for SNMP requests. To enable
+#	SNMP support set this to a suitable port number. Port number
+#	3401 is often used for the Squid SNMP agent. By default it's
+#	set to "0" (disabled)
+#Default:
+# snmp_port 0
+#
+#snmp_port 3401
+
+#  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.  The standard UDP port for ICP is 3130.
+#	Default is disabled (0).
+#Default:
+# icp_port 0
+#
+icp_port 3130
+
+#  TAG: htcp_port
+#	The port number where Squid sends and receives HTCP queries to
+#	and from neighbor caches.  To turn it on you want to set it to
+#	4827. By default it is set to "0" (disabled).
+#Default:
+# htcp_port 0
+#
+#htcp_port 4827
+
+#  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
+
+#  TAG: background_ping_rate	time-units
+#	Controls how often the ICP pings are sent to siblings that
+#	have background-ping set.
+#
+#Default:
+# background_ping_rate 10 seconds
+
+
+# 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
+# Note: This option is only available if Squid is rebuilt with the
+#       -DMULTICAST_MISS_STREAM define
+#
+#	If you enable this option, every "cache miss" URL will
+#	be sent out on the specified multicast address.
+#
+#	Do not enable this option unless you are are absolutely
+#	certain you understand what you are doing.
+#
+#Default:
+# mcast_miss_addr 255.255.255.255
+
+#  TAG: mcast_miss_ttl
+# Note: This option is only available if Squid is rebuilt with the
+#       -DMULTICAST_MISS_STREAM define
+#
+#	This is the time-to-live value for packets multicasted
+#	when multicasting off cache miss URLs is enabled.  By
+#	default this is set to 'site scope', i.e. 16.
+#
+#Default:
+# mcast_miss_ttl 16
+
+#  TAG: mcast_miss_port
+# Note: This option is only available if Squid is rebuilt with the
+#       -DMULTICAST_MISS_STREAM define
+#
+#	This is the port number to be used in conjunction with
+#	'mcast_miss_addr'.
+#
+#Default:
+# mcast_miss_port 3135
+
+#  TAG: mcast_miss_encode_key
+# Note: This option is only available if Squid is rebuilt with the
+#       -DMULTICAST_MISS_STREAM define
+#
+#	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 disabled it will revert to the old behavior of including
+#	it's own name and port in the URL.
+#
+#	If you run a complex cache hierarchy with a mix of Squid and
+#	other proxies you may need to disable this directive.
+#
+#Default:
+# short_icon_urls on
+
+
+# ERROR PAGE OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: error_directory
+#	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.
+#
+#Default:
+# error_directory /usr/share/squid/errors/English
+
+#  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: email_err_data	on|off
+#	If enabled, information about the occurred error will be
+#	included in the mailto links of the ERR pages (if %W is set)
+#	so that the email body contains the data.
+#	Syntax is <A HREF="mailto:%w%W">%w</A>
+#
+#Default:
+# email_err_data on
+
+#  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: accept_filter
+#	FreeBSD:
+#
+#	The name of an accept(2) filter to install on Squid's
+#	listen socket(s).  This feature is perhaps specific to
+#	FreeBSD and requires support in the kernel.
+#
+#	The 'httpready' filter delays delivering new connections
+#	to Squid until a full HTTP request has been received.
+#	See the accf_http(9) man page for details.
+#
+#	The 'dataready' filter delays delivering new connections
+#	to Squid until there is some data to process.
+#	See the accf_dataready(9) man page for details.
+#
+#	Linux:
+#	
+#	The 'data' filter delays delivering of new connections
+#	to Squid until there is some data to process by TCP_ACCEPT_DEFER.
+#	You may optionally specify a number of seconds to wait by
+#	'data=N' where N is the number of seconds. Defaults to 30
+#	if not specified.  See the tcp(7) man page for details.
+#EXAMPLE:
+## FreeBSD
+#accept_filter httpready
+## Linux
+#accept_filter data
+#
+#Default:
+# none
+
+#  TAG: tcp_recv_bufsize	(bytes)
+#	Size of receive buffer to set for TCP sockets.  Probably just
+#	as easy to change your kernel's default.  Set to zero to use
+#	the default buffer size.
+#
+#Default:
+# tcp_recv_bufsize 0 bytes
+
+
+# ICAP OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: icap_enable	on|off
+# Note: This option is only available if Squid is rebuilt with the
+#       -DICAP_CLIENT define
+#
+#	If you want to enable the ICAP module support, set this to on.
+#
+#Default:
+# icap_enable off
+
+#  TAG: icap_connect_timeout
+# Note: This option is only available if Squid is rebuilt with the
+#       -DICAP_CLIENT define
+#
+#	This parameter specifies how long to wait for the TCP connect to
+#	the requested ICAP server to complete before giving up and either
+#	terminating the HTTP transaction or bypassing the failure.
+#
+#	The default for optional services is peer_connect_timeout.
+#	The default for essential services is connect_timeout.
+#	If this option is explicitly set, its value applies to all services.
+#
+#Default:
+# none
+
+#  TAG: icap_io_timeout	time-units
+# Note: This option is only available if Squid is rebuilt with the
+#       -DICAP_CLIENT define
+#
+#	This parameter specifies how long to wait for an I/O activity on
+#	an established, active ICAP connection before giving up and
+#	either terminating the HTTP transaction or bypassing the
+#	failure.
+#
+#	The default is read_timeout.
+#
+#Default:
+# none
+
+#  TAG: icap_service_failure_limit
+# Note: This option is only available if Squid is rebuilt with the
+#       -DICAP_CLIENT define
+#
+#	The limit specifies the number of failures that Squid tolerates
+#	when establishing a new TCP connection with an ICAP service. If
+#	the number of failures exceeds the limit, the ICAP service is
+#	not used for new ICAP requests until it is time to refresh its
+#	OPTIONS. The per-service failure counter is reset to zero each
+#	time Squid fetches new service OPTIONS.
+#
+#	A negative value disables the limit. Without the limit, an ICAP
+#	service will not be considered down due to connectivity failures
+#	between ICAP OPTIONS requests.
+#
+#Default:
+# icap_service_failure_limit 10
+
+#  TAG: icap_service_revival_delay
+# Note: This option is only available if Squid is rebuilt with the
+#       -DICAP_CLIENT define
+#
+#	The delay specifies the number of seconds to wait after an ICAP
+#	OPTIONS request failure before requesting the options again. The
+#	failed ICAP service is considered "down" until fresh OPTIONS are
+#	fetched.
+#
+#	The actual delay cannot be smaller than the hardcoded minimum
+#	delay of 30 seconds.
+#
+#Default:
+# icap_service_revival_delay 180
+
+#  TAG: icap_preview_enable	on|off
+# Note: This option is only available if Squid is rebuilt with the
+#       -DICAP_CLIENT define
+#
+#	The ICAP Preview feature allows the ICAP server to handle the
+#	HTTP message by looking only at the beginning of the message body
+#	or even without receiving the body at all. In some environments, 
+#	previews greatly speedup ICAP processing.
+#
+#	During an ICAP OPTIONS transaction, the server may tell	Squid what
+#	HTTP messages should be previewed and how big the preview should be.
+#	Squid will not use Preview if the server did not request one.
+#
+#	To disable ICAP Preview for all ICAP services, regardless of
+#	individual ICAP server OPTIONS responses, set this option to "off".
+#Example:
+#icap_preview_enable off
+#
+#Default:
+# icap_preview_enable on
+
+#  TAG: icap_preview_size
+# Note: This option is only available if Squid is rebuilt with the
+#       -DICAP_CLIENT define
+#
+#	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_default_options_ttl
+# Note: This option is only available if Squid is rebuilt with the
+#       -DICAP_CLIENT define
+#
+#	The default TTL value for ICAP OPTIONS responses that don't have
+#	an Options-TTL header.
+#
+#Default:
+# icap_default_options_ttl 60
+
+#  TAG: icap_persistent_connections	on|off
+# Note: This option is only available if Squid is rebuilt with the
+#       -DICAP_CLIENT define
+#
+#	Whether or not Squid should use persistent connections to
+#	an ICAP server.
+#
+#Default:
+# icap_persistent_connections on
+
+#  TAG: icap_send_client_ip	on|off
+# Note: This option is only available if Squid is rebuilt with the
+#       -DICAP_CLIENT define
+#
+#	This adds the header "X-Client-IP" to ICAP requests.
+#
+#Default:
+# icap_send_client_ip off
+
+#  TAG: icap_send_client_username	on|off
+# Note: This option is only available if Squid is rebuilt with the
+#       -DICAP_CLIENT define
+#
+#	This sends authenticated HTTP client username (if available) to
+#	the ICAP service. The username value is encoded based on the
+#	icap_client_username_encode option and is sent using the header
+#	specified by the icap_client_username_header option.
+#
+#Default:
+# icap_send_client_username off
+
+#  TAG: icap_client_username_header
+# Note: This option is only available if Squid is rebuilt with the
+#       -DICAP_CLIENT define
+#
+#	ICAP request header name to use for send_client_username.
+#
+#Default:
+# icap_client_username_header X-Client-Username
+
+#  TAG: icap_client_username_encode	on|off
+# Note: This option is only available if Squid is rebuilt with the
+#       -DICAP_CLIENT define
+#
+#	Whether to base64 encode the authenticated client username.
+#
+#Default:
+# icap_client_username_encode off
+
+#  TAG: icap_service
+# Note: This option is only available if Squid is rebuilt with the
+#       -DICAP_CLIENT define
+#
+#	Defines a single ICAP service
+#
+#	icap_service servicename vectoring_point bypass service_url
+#
+#	vectoring_point = reqmod_precache|reqmod_postcache|respmod_precache|respmod_postcache
+#		This specifies at which point of transaction processing the
+#		ICAP service should be activated. *_postcache vectoring points
+#		are not yet supported.
+#	bypass = 1|0
+#		If set to 1, the ICAP service is treated as optional. If the
+#		service cannot be reached or malfunctions, Squid will try to
+#		ignore any errors and process the message as if the service
+#		was not enabled. No all ICAP errors can be bypassed.
+#		If set to 0, the ICAP service is treated as essential and all
+#		ICAP errors will result in an error page returned to the
+#		HTTP client.
+#	service_url = icap://servername:port/service
+#
+#Example:
+#icap_service service_1 reqmod_precache 0 icap://icap1.mydomain.net:1344/reqmod
+#icap_service service_2 respmod_precache 0 icap://icap2.mydomain.net:1344/respmod
+#
+#Default:
+# none
+
+#  TAG: icap_class
+# Note: This option is only available if Squid is rebuilt with the
+#       -DICAP_CLIENT define
+#
+#	Defines an ICAP service chain. Eventually, multiple services per
+#	vectoring point will be supported. For now, please specify a single
+#	service per class:
+#
+#	icap_class classname servicename
+#
+#Example:
+#icap_class class_1 service_1
+#icap class class_2 service_1
+#icap class class_3 service_3
+#
+#Default:
+# none
+
+#  TAG: icap_access
+# Note: This option is only available if Squid is rebuilt with the
+#       -DICAP_CLIENT define
+#
+#	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
+
+
+# DNS OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: check_hostnames
+#	For security and stability reasons Squid can check
+#	hostnames for Internet standard RFC compliance. If you want
+#	Squid to perform these checks turn this directive on.
+#
+#Default:
+# check_hostnames off
+
+#  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/libexec/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: refresh_all_ims	on|off
+#	When you enable this option, squid will always check
+#	the origin server for an update when a client sends an
+#	If-Modified-Since request.  Many browsers use IMS
+#	requests when the user requests a reload, and this
+#	ensures those clients receive the latest version.
+#
+#	By default (off), squid may return a Not Modified response
+#	based on the age of the cached version.
+#
+#Default:
+# refresh_all_ims off
+
+#  TAG: reload_into_ims	on|off
+#	When you enable this option, client no-cache or ``reload''
+#	requests will be changed to If-Modified-Since requests.
+#	Doing this VIOLATES the HTTP standard.  Enabling this
+#	feature could make you liable for problems which it
+#	causes.
+#
+#	see also refresh_pattern for a more selective approach.
+#
+#Default:
+# reload_into_ims off
+
+#  TAG: maximum_single_addr_tries
+#	This sets the maximum number of connection attempts for a
+#	host that only has one address (for multiple-address hosts,
+#	each address is tried once).
+#
+#	The default value is one attempt, the (not recommended)
+#	maximum is 255 tries.  A warning message will be generated
+#	if it is set to a value greater than ten.
+#
+#	Note: This is in addition to the request re-forwarding which
+#	takes place if Squid fails to get a satisfying response.
+#
+#Default:
+# maximum_single_addr_tries 1
+
+#  TAG: retry_on_error
+#	If set to on Squid will automatically retry requests when
+#	receiving an error response. This is mainly useful if you
+#	are in a complex cache hierarchy to work around access
+#	control errors.
+#
+#Default:
+# retry_on_error off
+
+#  TAG: 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/log/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
+