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There are reports of a few "SC" in logs during reloads when H2 is used on the backend side. Christopher analysed this as being caused by the proxy disabled test in h2_process(). As the comment says, this was done for frontends only, and must absolutely not send a GOAWAY to the backend, as all it will result in is to make newly queued streams fail. The fix consists in simply testing the connection side before deciding to send the GOAWAY. This may be backported as far as 2.0, though for whatever reason it seems to manifest itself only since 2.2 (probably due to changes in the outgoing connection setup sequence).
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)