Squid is a HTTP proxy server commonly used by businesses. The first version of Squid dates back to 1996.
Its main function is as a direct proxy, used to regulate web traffic and to cache frequently viewed content. In some cases it is also used as a reverse proxy in web architectures. When used for access control, blacklisted URLs can be procured from third party suppliers.
Squid is distributed under the GPL.
Squid was inspired by the Harvest project. It has been compatible with IPv6 since version 3.
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