Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web pages. Squid has extensive access controls and makes a great server accelerator.

Squid 3.4 represents a new feature release above 3.3.

The most important of these new features are:

* Helper protocol extensions
* SSL Server Certificate Validator
* Store-ID
* TPROXY Support for OpenBSD 5.1+ and FreeBSD 9+
* Transaction Annotations
* Multicast DNS

Most user-facing changes are reflected in squid.conf (see below).

First STABLE release Date: 08 Dec 2013