LITA Regional Institute: Proxy Web Servers and AuthenticationProxy Web Servers and Authentication > Free Proxy Servers
"This module implements a proxy/cache for Apache. It implements proxying capability for FTP, CONNECT (for SSL), HTTP/0.9, and HTTP/1.0. The module can be configured to connect to other proxy modules for these and other protocols."
http://www.apache.org/docs/mod/mod_proxy.html