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<H1>Squid 3.5.23 release notes</H1>

<H2>Squid Developers</H2>
<HR>
<EM>This document contains the release notes for version 3.5 of Squid.
Squid is a WWW Cache application developed by the National Laboratory
for Applied Network Research and members of the Web Caching community.</EM>
<HR>
<P>
<H2><A NAME="toc1">1.</A> <A HREF="#s1">Notice</A></H2>

<UL>
<LI><A NAME="toc1.1">1.1</A> <A HREF="#ss1.1">Known issues</A>
<LI><A NAME="toc1.2">1.2</A> <A HREF="#ss1.2">Changes since earlier releases of Squid-3.5</A>
<LI><A NAME="toc1.3">1.3</A> <A HREF="#ss1.3">Copyright disclaimer adjustments</A>
</UL>
<P>
<H2><A NAME="toc2">2.</A> <A HREF="#s2">Major new features since Squid-3.4</A></H2>

<UL>
<LI><A NAME="toc2.1">2.1</A> <A HREF="#ss2.1">Support libecap v1.0</A>
<LI><A NAME="toc2.2">2.2</A> <A HREF="#ss2.2">Authentication helper query extensions</A>
<LI><A NAME="toc2.3">2.3</A> <A HREF="#ss2.3">Support named services</A>
<LI><A NAME="toc2.4">2.4</A> <A HREF="#ss2.4">Upgraded squidclient tool</A>
<LI><A NAME="toc2.5">2.5</A> <A HREF="#ss2.5">Helper support for concurrency channels</A>
<LI><A NAME="toc2.6">2.6</A> <A HREF="#ss2.6">Native FTP Relay</A>
<LI><A NAME="toc2.7">2.7</A> <A HREF="#ss2.7">Receive PROXY protocol, Versions 1 &amp; 2</A>
<LI><A NAME="toc2.8">2.8</A> <A HREF="#ss2.8">Basic authentication MSNT helper changes</A>
<LI><A NAME="toc2.9">2.9</A> <A HREF="#ss2.9">Elliptic Curve Diffie-Hellman (ECDH)</A>
</UL>
<P>
<H2><A NAME="toc3">3.</A> <A HREF="#s3">Changes to squid.conf since Squid-3.4</A></H2>

<UL>
<LI><A NAME="toc3.1">3.1</A> <A HREF="#ss3.1">New tags</A>
<LI><A NAME="toc3.2">3.2</A> <A HREF="#ss3.2">Changes to existing tags</A>
<LI><A NAME="toc3.3">3.3</A> <A HREF="#ss3.3">Removed tags</A>
</UL>
<P>
<H2><A NAME="toc4">4.</A> <A HREF="#s4">Changes to ./configure options since Squid-3.4</A></H2>

<UL>
<LI><A NAME="toc4.1">4.1</A> <A HREF="#ss4.1">New options</A>
<LI><A NAME="toc4.2">4.2</A> <A HREF="#ss4.2">Changes to existing options</A>
<LI><A NAME="toc4.3">4.3</A> <A HREF="#ss4.3">Removed options</A>
</UL>
<P>
<H2><A NAME="toc5">5.</A> <A HREF="#s5">Regressions since Squid-2.7</A></H2>

<UL>
<LI><A NAME="toc5.1">5.1</A> <A HREF="#ss5.1">Missing squid.conf options available in Squid-2.7</A>
</UL>
<P>
<H2><A NAME="toc6">6.</A> <A HREF="#s6">Copyright</A></H2>


<HR>
<H2><A NAME="s1">1.</A> <A HREF="#toc1">Notice</A></H2>

<P>The Squid Team are pleased to announce the release of Squid-3.5.23.</P>
<P>This new release is available for download from 
<A HREF="http://www.squid-cache.org/Versions/v3/3.5/">http://www.squid-cache.org/Versions/v3/3.5/</A> or the
<A HREF="http://www.squid-cache.org/Download/http-mirrors.html">mirrors</A>.</P>

<P>Some interesting new features adding system flexibility have been added along with general improvements all around.
While this release is not fully bug-free we believe it is ready for use in production on many systems.</P>

<P>We welcome feedback and bug reports. If you find a bug, please see 
<A HREF="http://wiki.squid-cache.org/SquidFaq/BugReporting">http://wiki.squid-cache.org/SquidFaq/BugReporting</A>
for how to submit a report with a stack trace.</P>

<H2><A NAME="ss1.1">1.1</A> <A HREF="#toc1.1">Known issues</A>
</H2>

<P>Although this release is deemed good enough for use in many setups, please note the existence of 
<A HREF="http://bugs.squid-cache.org/buglist.cgi?query_format=advanced&amp;product=Squid&amp;bug_status=UNCONFIRMED&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;version=3.5">open bugs against Squid-3.5</A>.</P>

<H2><A NAME="ss1.2">1.2</A> <A HREF="#toc1.2">Changes since earlier releases of Squid-3.5</A>
</H2>

<P>The 3.5 change history can be 
<A HREF="http://www.squid-cache.org/Versions/v3/3.5/changesets/">viewed here</A>.</P>

<H2><A NAME="ss1.3">1.3</A> <A HREF="#toc1.3">Copyright disclaimer adjustments</A>
</H2>

<P>Squid sources are now administered by the Squid Software Foundation on
behalf of the Squid Project and community.</P>

<P>This version of Squid contains initial changes to streamline copyright
declarations in Squid sources and related metafiles. No functionality
or licensing changes are intended.</P>

<P>Once completed, the changes will consistently declare Squid contributors
(listed in CONTRIBUTORS and represented by the Squid Software Foundation) as
Squid copyright owners while referring the reader to the COPYING file for GPL
licensing details. The boilerplate with the above information is provided.</P>

<P>These changes do not affect copyright rights of individuals or organizations.
We are simply confirming the fact that there are many Squid copyright owners,
just like there are many Linux kernel copyright owners. We are also providing
a simple, consistent way to document that fact.</P>


<H2><A NAME="s2">2.</A> <A HREF="#toc2">Major new features since Squid-3.4</A></H2>

<P>Squid 3.5 represents a new feature release above 3.4.</P>

<P>The most important of these new features are:
<UL>
<LI>Support libecap v1.0</LI>
<LI>Authentication helper query extensions</LI>
<LI>Support named services</LI>
<LI>Upgraded squidclient tool</LI>
<LI>Helper support for concurrency channels</LI>
<LI>Native FTP Relay</LI>
<LI>Receive PROXY protocol, Versions 1 &amp; 2</LI>
<LI>Basic authentication MSNT helper changes</LI>
<LI>Elliptic Curve Diffie-Hellman (ECDH) (since 3.5.13)</LI>
</UL>
</P>
<P>Most user-facing changes are reflected in squid.conf (see below).</P>


<H2><A NAME="ss2.1">2.1</A> <A HREF="#toc2.1">Support libecap v1.0</A>
</H2>

<P>Details at 
<A HREF="http://wiki.squid-cache.org/Features/eCAP">http://wiki.squid-cache.org/Features/eCAP</A>.</P>

<P>The new libecap version allows Squid to better check the version of
the eCAP adapter being loaded as well as the version of the eCAP library
being used.</P>

<P>Squid-3.5 can support eCAP adapters built with libecap v1.0,
but no longer supports adapters built with earlier libecap versions
due to API changes.</P>


<H2><A NAME="ss2.2">2.2</A> <A HREF="#toc2.2">Authentication helper query extensions</A>
</H2>

<P>Details at 
<A HREF="http://www.squid-cache.org/Doc/config/auth_param/">http://www.squid-cache.org/Doc/config/auth_param/</A>.</P>

<P>The new <EM>key_extras</EM> parameter allows sending of additional
details to the authentication helper beyond the minimum required for
the HTTP authentication. This is primarily intended to allow switching
of authentication databases based on criteria such as client IP subnet,
Squid receiving port, or in reverse-proxy the requested domain name.</P>

<P>In theory any <EM>logformat</EM> code may be used, however only the
codes which have available details at the time of authentication
will send any meaningful detail.</P>


<H2><A NAME="ss2.3">2.3</A> <A HREF="#toc2.3">Support named services</A>
</H2>

<P>Details at 
<A HREF="http://wiki.squid-cache.org/MultipleInstances">http://wiki.squid-cache.org/MultipleInstances</A>.</P>
<P>Terminology details at 
<A HREF="http://wiki.squid-cache.org/Features/SmpScale#Terminology">http://wiki.squid-cache.org/Features/SmpScale#Terminology</A>.</P>

<P>The command line option <EM>-n</EM> assigns a name to the Squid service
instance to be used as a unique identifier for all SMP processes run as
part of that instance. This allows multiple instances of Squid service to
be run on a single machine without background SMP systems such as shared
memory and inter-process communication becoming confused or requiring
additional configuration.</P>

<P>A service name is always used. When the <EM>-n</EM> option is missing
from the command line the default service name is <EM>squid</EM>.</P>

<P>When multiple instances are being run the <EM>-n</EM> service name is
required to target all other options such as <EM>-z</EM> or <EM>-k</EM>
commands at the correct service.</P>

<P>The squid.conf macro ${service_name} is added to provide the service name
of the process parsing the config.</P>


<H2><A NAME="ss2.4">2.4</A> <A HREF="#toc2.4">Upgraded squidclient tool</A>
</H2>

<P>Details at 
<A HREF="http://www.squid-cache.org/Versions/v3/3.5/manuals/squidclient.html">http://www.squid-cache.org/Versions/v3/3.5/manuals/squidclient.html</A>.</P>

<P>The <EM>squidclient</EM> has begun the process of upgrading to support
protocols other than HTTP.</P>

<H3>Debug levels</H3>

<P>The tool displays the server response message on STDOUT unless the <EM>-q</EM>
command line option is used. Error messages will be output to STDERR.
All other possible output is considered debug and output to STDERR using
a range of debug verbosity levels (currently 1, 2 and 3).</P>

<P>When the <EM>-v</EM> command line option is used debugging is enabled.
The level of debug display is raised for each repetition of the option.</P>

<H3>PING</H3>

<P>When <EM>--ping</EM> is given the tool will send its message repeatedly
using whichever protocol that message has been formatted for.
Optional parameters to limit the number of pings and their frequency are
available.</P>

<P>Older tool versions also provide this feature but require the loop count
parameter to be set to enable use of the feature.</P>

<H3>HTTPS</H3>

<P>When Squid is built with the GnuTLS encryption library the tool is able
to open TLS (or SSL/3.0) connections to servers.</P>

<P>The <EM>--https</EM> option enables TLS using default values.</P>

<P>The <EM>--cert</EM> option specifies a file containing X.509 client
certificate and private key in PEM format to be loaded for use. Multiple
certificates are supported and the option may be used multiple times to
load certificates.
The default is not to use a client certificate.</P>

<P>The <EM>--params</EM> option specifies a library specific set of parameters
to be sent to the library for configuring the security context.
See 
<A HREF="http://gnutls.org/manual/html_node/Priority-Strings.html">http://gnutls.org/manual/html_node/Priority-Strings.html</A> for
available GnuTLS parameters.</P>

<P>The <EM>--trusted-ca</EM> option specifies a file in PEM format containing
one or more Certificate Authority (CA) certificates used to verify the
remote server. This option may be used multiple times to load additional
CA certificate lists.
The default is not to use any CA, nor trust any server.</P>

<P>Anonymous TLS (using non-authenticated Diffi-Hellman or Elliptic Curve
encryption) is available with the <EM>--anonymous-tls</EM> option.
The default is to use X.509 certificate encryption instead.</P>

<P>When performing TLS/SSL server certificates are always verified, the
results shown at debug level 3. The encrypted type is displayed at debug
level 2 and the connection is used to send and receive the messages
regardless of verification results.</P>


<H2><A NAME="ss2.5">2.5</A> <A HREF="#toc2.5">Helper support for concurrency channels</A>
</H2>

<P>Helper concurrency greatly reduces the communication lag between Squid
and its helpers allowing faster transaction speeds even on sequential
helpers.</P>

<P>The Digest authentication, Store-ID, and URL-rewrite helpers packaged
with Squid have been updated to support concurrency channels. They will
auto-detect the <EM>channel-ID</EM> field and will produce the appropriate
response format.
With these helpers concurrency may now be set to 0 or any higher number as desired.</P>


<H2><A NAME="ss2.6">2.6</A> <A HREF="#toc2.6">Native FTP Relay</A>
</H2>

<P>Details at 
<A HREF="http://wiki.squid-cache.org/Features/FtpRelay">http://wiki.squid-cache.org/Features/FtpRelay</A>.</P>

<P>Squid is now capable of accepting native FTP commands and relaying native
FTP messages between FTP clients and FTP servers. Native FTP commands
accepted at ftp_port are internally converted or wrapped into HTTP-like
messages. The same happens to Native FTP responses received from FTP origin
servers. Those HTTP-like messages are shoveled through regular access
control and adaptation layers between the FTP client and the FTP origin
server. This allows Squid to examine, adapt, block, and log FTP exchanges.
Squid reuses most HTTP mechanisms when shoveling wrapped FTP messages. For
example, http_access and adaptation_access directives are used.</P>

<P>FTP Relay is a new, experimental, complex feature that has seen limited
production exposure. Some Squid modules (e.g., caching) do not currently
work with native FTP proxying, and many features have not even been tested
for compatibility. Test well before deploying!</P>

<P>Native FTP proxying differs substantially from proxying HTTP requests with
<EM>ftp://</EM> URIs because Squid works as an FTP server and receives
actual FTP commands (rather than HTTP requests with FTP URLs).</P>

<P>FTP Relay highlights:
<UL>
<LI>Added ftp_port directive telling Squid to relay native FTP commands.</LI>
<LI>Active and passive FTP support on the user-facing side; require
passive connections to come from the control connection source IP
address.</LI>
<LI>IPv6 support (EPSV and, on the user-facing side, EPRT).</LI>
<LI>Intelligent adaptation of relayed FTP FEAT responses.</LI>
<LI>Relaying of multi-line FTP control responses using various formats.</LI>
<LI>Support relaying of FTP MLSD and MLST commands (RFC 3659).</LI>
<LI>Several Microsoft FTP server compatibility features.</LI>
<LI>ICAP/eCAP support (at individual FTP command/response level).</LI>
<LI>Optional "current FTP directory" tracking with the assistance of
injected (by Squid) PWD commands (cannot be 100% reliable due to
symbolic links and such, but is helpful in some common use cases).</LI>
<LI>No caching support -- no reliable Request URIs for that (see above).</LI>
</UL>
</P>

<H2><A NAME="ss2.7">2.7</A> <A HREF="#toc2.7">Receive PROXY protocol, Versions 1 &amp; 2</A>
</H2>

<P>More info at 
<A HREF="http://www.haproxy.org/download/1.5/doc/proxy-protocol.txt">http://www.haproxy.org/download/1.5/doc/proxy-protocol.txt</A></P>

<P>PROXY protocol provides a simple way for proxies and tunnels of any kind to
relay the original client source details without having to alter or understand
the protocol being relayed on the connection.</P>

<P>Squid currently supports receiving HTTP traffic from a client proxy using this protocol.
An <EM>http_port</EM> which has been configured to receive this protocol may only be used
to receive traffic from client software sending in this protocol.
HTTP traffic without the PROXY header is not accepted on such a port.</P>

<P>The <EM>accel</EM> and <EM>intercept</EM> options are still used to identify the HTTP
traffic syntax being delivered by the client proxy.</P>

<P>Squid can be configured by adding an <EM>http_port</EM>
with the <EM>require-proxy-header</EM> mode flag. The <EM>proxy_protocol_access</EM>
must also be configured with <EM>src</EM> ACLs to whitelist proxies which are
trusted to send correct client details.</P>

<P>Forward-proxy traffic from a client proxy:
<PRE>
 acl frontend src 192.0.2.1
 http_port 3128 require-proxy-header
 proxy_protocol_access allow frontend
</PRE>
</P>

<P>Intercepted traffic from a client proxy or tunnel:
<PRE>
 acl frontend src 192.0.2.2
 http_port 3128 intercept require-proxy-header
 proxy_protocol_access allow frontend
</PRE>
</P>

<P>Reverse-proxy traffic from a frontend load balancer sending PROXY protocol:
<PRE>
 acl frontend src 192.0.2.3
 http_port 3128 accel require-proxy-header
 proxy_protocol_access allow frontend
</PRE>
</P>

<P><EM>Known Issue:</EM>
Use of <EM>require-proxy-header</EM> on <EM>https_port</EM> and <EM>ftp_port</EM> is not supported.</P>


<H2><A NAME="ss2.8">2.8</A> <A HREF="#toc2.8">Basic authentication MSNT helper changes</A>
</H2>

<P>The authentication helper previously known as <EM>basic_msnt_auth</EM> has
been deprecated and renamed to <EM>basic_smb_lm_auth</EM> to reflect that
it only performs SMB LanMan protocol(s) instead of modern MS authentication
protocols.</P>

<P>The <EM>basic_smb_lm_auth</EM> helper has been remodelled and no longer uses
configuration files. The Doman Controller servers are now configured via
command line parameters and user credentials are looked up in each DC in the
order configured until one matches or all have confirmed a non-match.</P>

<P>The <EM>MSNT-multi-domain</EM> helper provides the same functionality and
is also deprecated. It will be removed in the Squid-3.6 series.</P>


<H2><A NAME="ss2.9">2.9</A> <A HREF="#toc2.9">Elliptic Curve Diffie-Hellman (ECDH)</A>
</H2>

<P>All listening port which supported Diffie-Hellman key exchange are now updated
to support Elliptic Curve configuration which allows for forward secrecy with
better performance than traditional ephemeral Diffie-Hellman.</P>

<P>The http(s)_port <EM>dhparams=</EM> option is replaced with <EM>tls-dh=</EM> that
takes an optional curve name as well as filename for curve parameters. The new
option configured without a curve name uses the traditional ephemeral DH.</P>

<P>A new <EM>options=SINGLE_ECDH_USE</EM> parameter is added to enable ephemeral
key exchanges for Elliptic Curve DH.</P>



<H2><A NAME="s3">3.</A> <A HREF="#toc3">Changes to squid.conf since Squid-3.4</A></H2>

<P>There have been changes to Squid's configuration file since Squid-3.4.</P>

<P>Squid supports reading configuration option parameters from external
files using the syntax <EM>parameters("/path/filename")</EM>. For example:
<PRE>
    acl whitelist dstdomain parameters("/etc/squid/whitelist.txt")
</PRE>
</P>

<P>The squid.conf macro <EM>${service_name}</EM> is added to provide the service name
of the process parsing the config.</P>

<P>There have also been changes to individual directives in the config file.</P>
<P>This section gives a thorough account of those changes in three categories:</P>
<P>
<UL>
<LI>
<A HREF="#newtags">New tags</A></LI>
<LI>
<A HREF="#modifiedtags">Changes to existing tags</A></LI>
<LI>
<A HREF="#removedtags">Removed tags</A></LI>
</UL>
</P>


<H2><A NAME="newtags"></A> <A NAME="ss3.1">3.1</A> <A HREF="#toc3.1">New tags</A>
</H2>

<P>
<DL>
<DT><B>collapsed_forwarding</B><DD>
<P>Ported from Squid-2 with no configuration or visible behaviour changes.
Collapsing of requests is performed across SMP workers.</P>

<DT><B>sslproxy_foreign_intermediate_certs</B><DD>
<P>New directive to load intermediate TLS certificates for
filling incomplete server certificate chains. Added in 3.5.13.</P>

<DT><B>ftp_client_idle_timeout</B><DD>
<P>New directive controlling how long to wait for an FTP request on a
client connection to Squid <EM>ftp_port</EM>.</P>
<P>Many FTP clients do not deal with idle connection closures well,
necessitating a longer default timeout (30 minutes) than
<EM>client_idle_pconn_timeout</EM> used for incoming HTTP requests (2
minutes).</P>
<P>The current default may be changed as we get more experience with FTP relaying.</P>

<DT><B>ftp_port</B><DD>
<P>New configuration directive to accept and relay native FTP
commands. Typically used for port 21 traffic.  By default, native
FTP commands are not accepted.</P>

<DT><B>proxy_protocol_access</B><DD>
<P>New directive to control which clients are permitted to open PROXY
protocol connections on a port flagged with <EM>require-proxy-header</EM>.</P>

<DT><B>send_hit</B><DD>
<P>New configuration directive to enable/disable sending cached content
based on ACL selection. ACL can be based on client request or cached
response details.</P>

<DT><B>sslproxy_cert_sign_hash</B><DD>
<P>New directive to set the hashing algorithm to use when signing generated certificates.</P>

<DT><B>sslproxy_foreign_intermediate_certs</B><DD>
<P>New directive to load intermediate certificates for validating server
certificate chains. This directive is only available in 3.5.13 and later.</P>

<DT><B>sslproxy_session_cache_size</B><DD>
<P>New directive which sets the cache size to use for TLS/SSL sessions cache.</P>

<DT><B>sslproxy_session_ttl</B><DD>
<P>New directive to specify the time in seconds the TLS/SSL session is valid.</P>

<DT><B>store_id_extras</B><DD>
<P>New directive to send additional lookup parameters to the configured
Store-ID helper program. It takes a string which may contain logformat %macros.</P>
<P>The Store-ID helper input format is now:
<PRE>
         [channel-ID] url [extras]
        
</PRE>
</P>
<P>The default value for extras is: "%&gt;a/%&gt;A %un %&gt;rm myip=%la myport=%lp"</P>

<DT><B>store_miss</B><DD>
<P>New configuration directive to enable/disable caching of MISS responses.
ACL can be based on any request or response details.</P>

<DT><B>url_rewrite_extras</B><DD>
<P>New directive to send additional lookup parameters to the configured
URL-rewriter/redirector helper program. It takes a string which may
contain logformat %macros.</P>
<P>The url rewrite and redirector helper input format is now:
<PRE>
         [channel-ID] url [extras]
        
</PRE>
</P>
<P>The default value for extras is: "%&gt;a/%&gt;A %un %&gt;rm myip=%la myport=%lp"</P>

</DL>
</P>

<H2><A NAME="modifiedtags"></A> <A NAME="ss3.2">3.2</A> <A HREF="#toc3.2">Changes to existing tags</A>
</H2>

<P>
<DL>
<DT><B>acl</B><DD>
<P>Deprecated type <EM>tag</EM>. Use type <EM>note</EM> with 'tag' key
name instead.</P>
<P>New type <EM>adaptation_service</EM> to match the name of any
icap_service, ecap_service, adaptation_service_set, or
adaptation_service_chain that Squid has used (or attempted to use)
for the HTTP transaction so far.</P>
<P>New type <EM>at_step</EM> to match the current SSL-Bump processing step.
Never matches and should not be used outside of <EM>ssl_bump</EM>.</P>
<P>New types <EM>ssl::server_name</EM> and <EM>ssl::server_name_regex</EM>
to match server name from various sources (CONNECT authority name,
TLS SNI domain, or X.509 certificate Subject Name).</P>
<P>Extended <EM>user_cert</EM> and <EM>ca_cert</EM> types to accept
numeric OID for certificate attributes.</P>

<DT><B>auth_param</B><DD>
<P>New parameter <EM>key_extras</EM> to send additional parameters to
the authentication helper.</P>

<DT><B>cache_dir</B><DD>
<P>New support for larger than 32KB objects in both <EM>rock</EM> type
cache and shared memory cache.</P>
<P>New <EM>slot-size=N</EM> option for rock cache to specify the database
slot/page size when small slot sizes are desired. The default and
maximum slot size is 32KB.</P>
<P>Removal of old rock cache dir followed by <EM>squid -z</EM> is required
when upgrading from earlier versions of Squid.</P>
<P><EM>COSS</EM> storage type is formally replaced by Rock storage type.
COSS storage type and all COSS specific options are removed.</P>

<DT><B>cache_peer</B><DD>
<P>New <EM>standby=N</EM> option to retain a set of N open and unused
connections to the peer at virtually all times to reduce TCP handshake
delays.</P>
<P>These connections differ from HTTP persistent connections in that they
have not been used for HTTP messaging (and may never be). They may be
turned into persistent connections after their first use subject to the
same keep-alive critera any HTTP connection is checked for.</P>
<P>Squid-2 option <EM>idle=</EM> replaced by <EM>standby=</EM>.</P>
<P>NOTE that standby connections are started earlier and available in
more circumstances than squid-2 idle connections were. They are
also spread over all IPs of the peer.</P>

<DT><B>configuration_includes_quoted_values</B><DD>
<P>Regex pattern values cannot be parsed in parts of squid.conf when this
directive is configured to <EM>ON</EM>. Instead of quoted strings Squid
now accepts regex \-escaped characters (including escaped spaces) in all
regex patterns.</P>

<DT><B>external_acl_type</B><DD>
<P>New format code <EM>%ssl::&gt;sni</EM> to send SSL client SNI.</P>
<P>New format code <EM>%ssl::&lt;cert_subject</EM> to send SSL server certificate DN.</P>
<P>New format code <EM>%ssl::&lt;cert_issuer</EM> to send SSL server certificate issuer DN.</P>
<P>New format code <EM>%un</EM> to send any available user name (requires 3.5.7 or later).</P>
<P>New format code <EM>%&gt;eui</EM> to send either EUI-48 or EUI-64 (requires 3.5.20 or later).</P>
<P>New response kv-pair <EM>clt_conn_tag=</EM> to associates a given tag with the client TCP connection.</P>

<DT><B>forward_max_tries</B><DD>
<P>Default value increased to <EM>25 destinations</EM> to allow better
contact and IPv4 failover with domains using long lists of IPv6
addresses.</P>

<DT><B>ftp_epsv</B><DD>
<P>Converted into an Access List with allow/deny value driven by ACLs
using Squid standard first line wins matching basis.</P>
<P>The old values of <EM>on</EM> and <EM>off</EM> imply <EM>allow all</EM>
and <EM>deny all</EM> respectively and are now deprecated.
Do not combine use of on/off values with ACL configuration.</P>

<DT><B>http_port</B><DD>
<P><EM>protocol=</EM> option altered to accept protocol version details.
Currently supported values are: HTTP, HTTP/1.1, HTTPS, HTTPS/1.1</P>
<P>New option <EM>require-proxy-header</EM> to mark ports receiving PROXY
protocol version 1 or 2 traffic.</P>
<P>New <EM>options=NO_TICKET</EM> parameter to disable TLS tickets
extension.</P>
<P>New <EM>options=SINGLE_ECDH_USE</EM> parameter to enable ephemeral
ECDH key exchange. Added in 3.5.13.</P>
<P>Deprecated <EM>dhparams=</EM> option. Use <EM>tls-dh=</EM> instead.
The new option allows to optionally specify an elliptic curve for
ephemeral ECDH by adding <EM>curve-name:</EM> in front of the
parameter file name. Added in 3.5.13.</P>

<DT><B>https_port</B><DD>
<P><EM>protocol=</EM> option altered to accept protocol version details.
Currently supported values are: HTTP, HTTP/1.1, HTTPS, HTTPS/1.1</P>
<P>New <EM>options=NO_TICKET</EM> parameter to disable TLS tickets
extension.</P>
<P>New <EM>options=SINGLE_ECDH_USE</EM> parameter to enable ephemeral
ECDH key exchange. Added in 3.5.13.</P>
<P>Deprecated <EM>dhparams=</EM> option. Use <EM>tls-dh=</EM> instead.
The new option allows to optionally specify an elliptic curve for
ephemeral ECDH by adding <EM>curve-name:</EM> in front of the
parameter file name. Added in 3.5.13.</P>

<DT><B>logformat</B><DD>
<P>New format code <EM>%credentials</EM> to log the client credentials token.</P>
<P>New format code <EM>%ssl::&gt;sni</EM> to TLS client SNI sent to Squid.</P>
<P>New format code <EM>%tS</EM> to log transaction start time in
"seconds.milliseconds" format, similar to the existing access.log
"current time" field (%ts.%03tu) which logs the corresponding
transaction finish time.</P>
<P>New format codes <EM>%&lt;rs</EM> and <EM>%&gt;rs</EM> to log request URL
scheme from client or sent to server/peer respectively.</P>
<P>New format codes <EM>%&lt;rd</EM> and <EM>%&gt;rd</EM> to log request URL
domain from client or sent to server/peer respectively.</P>
<P>New format codes <EM>%&lt;rP</EM> and <EM>%&gt;rP</EM> to log request URL
port from client or sent to server/peer respectively.</P>

<DT><B>ssl_bump</B><DD>
<P>Bumping 'modes' redesigned as 'actions' and ACLs evaluated repeatedly in a number of steps.</P>
<P>Renamed <EM>server-first</EM> as <EM>bump</EM> action.</P>
<P>Renamed <EM>none</EM> as <EM>splice</EM> action.</P>
<P>New actions <EM>peek</EM> and <EM>stare</EM> to receive client or server
certificate while preserving the ability to later decide between bumping
or splicing the connections later.</P>
<P>New action <EM>terminate</EM> to close the client and server connections.</P>

<DT><B>url_rewrite_program</B><DD>
<P>New response kv-pair <EM>clt_conn_tag=</EM> to associates a given tag with the client TCP connection.</P>

</DL>
</P>

<H2><A NAME="removedtags"></A> <A NAME="ss3.3">3.3</A> <A HREF="#toc3.3">Removed tags</A>
</H2>

<P>
<DL>
<DT><B>cache_dns_program</B><DD>
<P>DNS external helper interface has been removed. It was no longer
able to provide high performance service and the internal DNS
client library with multicast DNS cover all modern use-cases.</P>

<DT><B>dns_children</B><DD>
<P>DNS external helper interface has been removed.</P>

<DT><B>hierarchy_stoplist</B><DD>
<P>Removed. The old directive values prohibiting CGI and dynamic content
going to cache_peer are no longer relevant.</P>
<P>The functionality provided by this directive can be configured
using <EM>always_direct allow</EM> if still needed.</P>

</DL>
</P>


<H2><A NAME="s4">4.</A> <A HREF="#toc4">Changes to ./configure options since Squid-3.4</A></H2>

<P>There have been some changes to Squid's build configuration since Squid-3.4.</P>
<P>This section gives an account of those changes in three categories:</P>
<P>
<UL>
<LI>
<A HREF="#newoptions">New options</A></LI>
<LI>
<A HREF="#modifiedoptions">Changes to existing options</A></LI>
<LI>
<A HREF="#removedoptions">Removed options</A></LI>
</UL>
</P>


<H2><A NAME="newoptions"></A> <A NAME="ss4.1">4.1</A> <A HREF="#toc4.1">New options</A>
</H2>

<P>
<DL>
<DT><B>BUILDCXX=</B><DD>
<P>Used when cross-compiling Squid.</P>
<P>The path and name of a compiler for building cf_gen and related
tools used in the compile process.</P>

<DT><B>BUILDCXXFLAGS=</B><DD>
<P>Used when cross-compiling Squid.</P>
<P>C++ compiler flags used for building cf_gen and related
tools used in the compile process.</P>

<DT><B>--without-gnutls</B><DD>
<P>New option to explicitly disable use of GnuTLS encryption library.
Use of this library is auto-enabled if v3.1.5 or later is available.</P>
<P>It is currently only used by the squidclient tool.</P>

<DT><B>--without-mit-krb5</B><DD>
<P>New option to explicitly disable use of MIT Kerberos library.
Default is to auto-detect and use if possible.</P>
<P>Only one Kerberos library may be built against.</P>

<DT><B>--without-heimdal-krb5</B><DD>
<P>New option to explicitly disable use of Hiemdal Kerberos library.
Default is to auto-detect and use if possible.</P>
<P>Only one Kerberos library may be built against.</P>

<DT><B>--without-gnugss</B><DD>
<P>New option to explicitly disable use of GNU GSSAPI library for Kerberos.
Default is to auto-detect and use if possible.</P>
<P>Only one Kerberos library may be built against.</P>

</DL>
</P>

<H2><A NAME="modifiedoptions"></A> <A NAME="ss4.2">4.2</A> <A HREF="#toc4.2">Changes to existing options</A>
</H2>

<P>
<DL>
<DT><B>--enable-icap-client</B><DD>
<P>Deprecated. ICAP client is now auto-enabled.
Use --disable-icap-client to disable if you need to.</P>

<DT><B>--with-nat-devpf</B><DD>
<P>IPv6 NAT interception support added for BSD built with this option.</P>

</DL>
</P>
<H2><A NAME="removedoptions"></A> <A NAME="ss4.3">4.3</A> <A HREF="#toc4.3">Removed options</A>
</H2>

<P>
<DL>
<DT><B>--disable-internal-dns</B><DD>
<P>DNS external helper interface has been removed. It was no longer
able to provide high performance service and the internal DNS
client library with multicast DNS cover all modern use-cases.</P>

<DT><B>--enable-ssl</B><DD>
<P>Removed. Use <EM>--with-openssl</EM> to enable OpenSSL library support.</P>

<DT><B>--with-coss-membuf-size</B><DD>
<P>The COSS cache type has been removed.
It has been replaced by <EM>rock</EM> cache type.</P>

<DT><B>--with-krb5-config</B><DD>
<P>Removed. The Kerberos library is auto-detected now.</P>
<P>Use <EM>--with/--without-mit-krb5</EM>, <EM>--with/--without-heimdal-krb5</EM>, or
<EM>--with/--without-gnugss</EM> options for specific library selection if necesary.</P>

</DL>
</P>


<H2><A NAME="s5">5.</A> <A HREF="#toc5">Regressions since Squid-2.7</A></H2>

<P>Some squid.conf options which were available in Squid-2.7 are not yet available in Squid-3.5</P>

<P>If you need something to do then porting one of these from Squid-2 to Squid-3 is most welcome.</P>

<H2><A NAME="ss5.1">5.1</A> <A HREF="#toc5.1">Missing squid.conf options available in Squid-2.7</A>
</H2>

<P>
<DL>
<DT><B>broken_vary_encoding</B><DD>
<P>Not yet ported from 2.6</P>

<DT><B>cache_peer</B><DD>
<P><EM>monitorinterval=</EM> not yet ported from 2.6</P>
<P><EM>monitorsize=</EM> not yet ported from 2.6</P>
<P><EM>monitortimeout=</EM> not yet ported from 2.6</P>
<P><EM>monitorurl=</EM> not yet ported from 2.6</P>

<DT><B>cache_vary</B><DD>
<P>Not yet ported from 2.6</P>

<DT><B>error_map</B><DD>
<P>Not yet ported from 2.6</P>

<DT><B>external_refresh_check</B><DD>
<P>Not yet ported from 2.7</P>

<DT><B>location_rewrite_access</B><DD>
<P>Not yet ported from 2.6</P>

<DT><B>location_rewrite_children</B><DD>
<P>Not yet ported from 2.6</P>

<DT><B>location_rewrite_concurrency</B><DD>
<P>Not yet ported from 2.6</P>

<DT><B>location_rewrite_program</B><DD>
<P>Not yet ported from 2.6</P>

<DT><B>refresh_pattern</B><DD>
<P><EM>stale-while-revalidate=</EM> not yet ported from 2.7</P>
<P><EM>ignore-stale-while-revalidate=</EM> not yet ported from 2.7</P>
<P><EM>negative-ttl=</EM> not yet ported from 2.7</P>

<DT><B>refresh_stale_hit</B><DD>
<P>Not yet ported from 2.7</P>

<DT><B>update_headers</B><DD>
<P>Not yet ported from 2.7</P>

</DL>
</P>

<H2><A NAME="s6">6.</A> <A HREF="#toc6">Copyright</A></H2>

<P>Copyright (C) 1996-2016 The Squid Software Foundation and contributors</P>
<P>Squid software is distributed under GPLv2+ license and includes
contributions from numerous individuals and organizations.
Please see the COPYING and CONTRIBUTORS files for details.</P>

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