Squid-2.5 features

New cache peer options

Cache peers can now be
Passed the basic authentication by the user
Useful if you wish to run a local proxy but have the authentication dealt with by an upstream proxy/firewall
cache_peer proxy parent 3128 3130 login=PASS

Passed the presented username only by the user
Pass only the username, with a fixed password
Useful for providing upstream proxies with accounting information
cache_peer proxy parent 3128 3130 login=*:password

Limited by the number of simultaneous connections
cache_peer proxy sibling 3128 3130 max-conn 50