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This function is used to decide whether to put an idle connection back into the idle pool. While it considers the limit in number of concurrent requests, it does not consider the limit in number of streams, so if a server announces a low limit in a GOAWAY frame, it will be ignored. However there is a caveat : since we assign the stream IDs when sending them, we have a number of allocated streams which max_id doesn't take care of. This can be addressed by adding a new nb_reserved count on each connection to keep track of the ID-less streams. This patch makes sure we take care of the remaining number of streams if such a limit was announced, or of the number of streams before the highest ID. Now it is possible to accurately know how many streams can be allocated, and the number of failed outgoing streams has dropped in half. This 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)