Pound (networking)

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Pound is a lightweight open source reverse proxy program suitable to be used as a web server load balancing solution. Developed by an IT security company, it has a strong emphasis on security. Using regular expression matching on the requested URLs, Pound can pass different kinds of requests to different backend server groups. A few more of its most important features:

detects when a backend server fails or recovers, and bases its load balancing decisions on this information: if a backend server fails, it will not receive requests until it recovers
decrypts https requests to http ones
rejects incorrect requests
can be used in a chroot environment
has no special requirements concerning which web server software or browser to use
supports virtual hosts
configurable

Pound is distributed under the terms of the GNU General Public License and can be used free of charge even in business environments.