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According to the H2 spec (see #8.1.4), setting the REFUSED_STREAM error code is a way to indicate that the stream is being closed prior to any processing having occurred, such as when a server-side H1 keepalive connection is closed without sending anything (which differs from the regular error case since haproxy doesn't even generate an error message). Any request that was sent on the reset stream can be safely retried. So, when a stream is closed, if no data was ever sent back (ie. the flag H2_SF_HEADERS_SENT is not set), we can set the REFUSED_STREAM error code on the RST_STREAM frame. This patch may 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)