Squid (software)

Squid

Squid project Logo[1]
Developer(s)	Duane Wessels, Henrik Nordström, Amos Jeffries, Alex Rousskov, Francesco Chemolli, Robert Collins, Guido Serassio and volunteers[2]
Initial release	July 1996; 27 years ago (1996-07)
Stable release	6.10[3]  / 10 June 2024
Repository	github.com/squid-cache/squid
Written in	C++[4]
Operating system	BSD, Linux, Unix, Windows[5]
Type	Proxy server
License	GPL 2.0 or later[6]
Website	www.squid-cache.org

Squid is a caching and forwarding HTTP web proxy. It has a wide variety of uses, including speeding up a web server by caching repeated requests, caching World Wide Web (WWW), Domain Name System (DNS), and other network lookups for a group of people sharing network resources, and aiding security by filtering traffic. Although used for mainly HTTP and File Transfer Protocol (FTP), Squid includes limited support for several other protocols including Internet Gopher, Secure Sockets Layer (SSL),^[7] Transport Layer Security (TLS), and Hypertext Transfer Protocol Secure (HTTPS). Squid does not support the SOCKS protocol, unlike Privoxy, with which Squid can be used in order to provide SOCKS support.

Squid was originally designed to run as a daemon on Unix-like systems. A Windows port was maintained up to version 2.7. New versions available on Windows use the Cygwin environment.^{[8] [9]} Squid is free software released under the GNU General Public License.