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When the body length is greater than a chunk size (so if length of POST data exceeds the buffer size), the requests is rejected with the status code STAT_STATUS_EXCD. Otherwise the stats applet will wait to have all the data to copy and parse them. But there is a problem when the total request size (including the headers) is just lower than the buffer size but greater the buffer size less the reserve. In such case, the body length is considered as enough small to be processed but not entierly received. So the stats applet waits for more data. But because outgoing data are still there, the channel's buffer is considered as full and nothing more can be read, leading to a freeze of the session. Note this bug is pretty easy to reproduce with the legacy HTTP. It is harder with the HTX but still possible. To fix the bug, in the stats applet, when the request is not fully received, we check if at least the reserve remains available the channel's buffer. This patch must be backported as far as 1.5. But because the HTX does not exist in 1.8 and lower, it will have to be adapted for these versions.
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)