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There is no reason to not use proxy's error replies to emit 401/407 responses. The function http_reply_40x_unauthorized(), responsible to emit those responses, is not really complex. It only adds a WWW-Authenticate/Proxy-Authenticate header to a generic message. So now, error replies can be defined for 401 and 407 status codes, using errorfile or http-error directives. When an http-request auth rule is evaluated, the corresponding error reply is used. For 401 responses, all occurrences of the WWW-Authenticate header are removed and replaced by a new one with a basic authentication challenge for the configured realm. For 407 responses, the same is done on the Proxy-Authenticate header. If the error reply must not be altered, "http-request return" rule must be used instead.
The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - BRANCHES to understand the project's life cycle and what version to use - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)