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YXORP is a reverse proxy for HTTP, written by Sytse van Slooten. The main focus for YXORP is checking the validity of the traffic, i.e. what would be called 'application level firewalling' or 'secure reverse proxy' in commercial products. It can check, validate, and change just about anything about an HTTP request or response, can load balance, and perform all other normal reversed proxy functions. YXORP aims to conform to RFC 2616, RFC 2518, RFC 2109 and other applicable standards.