Squid is a fully-featured HTTP/1.0 proxy which is almost (but not quite - we're getting there!) a fully-featured HTTP/1.1 proxy. Squid offers a rich access control, authorization and logging environment to develop web proxy and content serving applications. Squid offers a rich set of traffic optimization options, most of which are enabled by default for simpler installation and high performance.
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
* TPROXY Support for OpenBSD 5.1+ and FreeBSD 9+
* Transaction Annotations
* Multicast DNS