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When a filter is attached on a stream, the FLT_END analyser must not be removed from the response channel on L7 retry. It is especially important because CF_FLT_ANALYZE flag is still set. This means the synchronization between the two sides when the filter ends can be blocked. Depending on the timing, this can freeze the stream infinitely or lead to a spinning loop. Note that the synchronization between the two sides at the end of the analysis was introduced because the stream was reused in HTTP between two transactions. But, since the HTX was introduced, a new stream is created for each transaction. So it is probably possible to remove this step for 2.2 and higher. This patch must be backported as far as 2.0.
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)