Squid/gl

Squid is a high-performance proxy server that can also be used as a HTTP accelerator for the webserver. (WMF has switched to using Varnish for HTTP-layer caching in preference to Squid but the term remains.)

See:
 * Squid Reverse Proxy
 * Manual:Squid caching
 * Manual:Varnish caching

and associated configuration variables:

and hook:


 * Manual:Hooks/TitleSquidURLs