The Squid HTTP Proxy team is very pleased to announce the availability
of the Squid-4.0.13 release!

This release is a bug fix release resolving several issues found in the
prior Squid releases.

The major changes to be aware of:

* HTTP/1.1: Update all stored headers on 304 revalidation.

Previous specifications for HTTP outlined a limited number of headers
that could be updated by 304 responses to a small set related to
revalidation. The latest RFC 7234 specification removes those limits and
permits custom headers, or content headers to be altered by a 304 response.

* TLS Authority Key Identifier certificate extension

The Server TLS certificate mimic feature now supports mimicking this TLS
extension in Squid generated TLS certificates if possible.

* Collapse internal revalidation requests (SMP-unaware caches).

Prior to these changes, multiple concurrent HTTP requests for the same
stale cached object always resulted in multiple internal revalidation
requests sent by Squid to the origin server. Those internal requests
were likely to result in multiple competing Squid cache updates, causing
cache misses and/or more internal revalidation requests, negating
collapsed forwarding savings.

* kerberos_ldap_group: support SSL/TLS used to connect to an LDAP server

This release of the helper extends and updates the use of TLS/SSL to
support connecting to an LDAP server.

* General portability and stability changes

This release also includes a large number of code polishing and cleanup
changes too small to mention individually, but which resolve a lot of
portability and build issues.

 All users of Squid-4.0.x are encouraged to upgrade to this release.

 All users of Squid-3 are encouraged to test this release out and plan
for upgrades where possible.

 See the ChangeLog for the full list of changes in this and earlier

Please refer to the release notes at
when you are ready to make the switch to Squid-4

This new release can be downloaded from our HTTP or FTP servers

or the mirrors. For a list of mirror sites see

If you encounter any issues with this release please file a bug report.

Amos Jeffries
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