The Squid HTTP Proxy team is very pleased to announce the availability
of the Squid-5.1 release!

This release is we believe, stable enough for general production use.

Support for Squid-4 bug fixes has now officially ceased. Bugs in 4.x
will continue to be fixed, however the fixes will be added to the 5.x
series. All users of Squid-4.x are encouraged to plan for upgrades.

A short list of the major new features is:

 * ICAP Trailers
 * Happy Eyeballs Update
 * Kerberos Group Helper
 * TrivialDB Support
 * Loop Detection in Content Delivery Networks
 * Peering support for SSL-Bump

Several features have been removed in 5.1:

 * dns_v4_first directive replaced with "Happy Eyeballs" algorithm
 * --disable-inline and USE_CHUNKEDMEMPOOLS built options

Further details can be found in the release notes or the wiki.

Please remember to run "squid -k parse" when testing upgrade to a new
version of Squid. It will audit your configuration files and report
any identifiable issues the new release will have in your installation
before you "press go".

Please be particularly aware that databases for ext_session_acl and
ext_time_quota_acl helpers when built with TrivialDB may differ from
helpers built with BerkleyDB. Manual removal and rebuild of the
database is advised when upgrading.

All feature additions are considered *experimental* until they have
survived at least one series of releases in general production use.
Please be aware of that when rolling out features which are new in
this series. Not all use-cases have been well tested yet and some may
not even have been implemented. Assistance is still needed despite the
releases general stability level.

Plans for the next series of releases is already well underway. Our
future release plan and upcoming features can be found at:

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

  All users of Squid-5.0 beta releases are urged to upgrade to this
  release as soon as possible.

  All users of Squid-4 are encouraged to 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-5

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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