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When an HTTP request with an empty body is received, the flag HTX_SL_F_BODYLESS is set on the HTX start-line block. It is true if the header content-length is explicitly set to 0 or if it is omitted for a non chunked request. On the server side, when the request is reformatted, because HTX_SL_F_BODYLESS is set, the flag H1_MF_CLEN is added on the request parser. It is done to not add an header transfer-encoding on bodyless requests. But if an header content-length is explicitly set to 0, when it is parsed, because H1_MF_CLEN is set, the function h1_parse_cont_len_header() returns 0, meaning the header can be dropped. So in such case, a request without any header content-length is sent to the server. Some servers seems to reject empty POST requests with an error 411 when there is no header content-length. So to fix this issue, on the output side, only headers with an invalid content length are skipped, ie only when the function h1_parse_cont_len_header() returns a negative value. This patch must be backported to 1.9.
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 - 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)