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When the protocol is changed for a client connection at the stream level (from TCP to H1/H2), there are two cases. The stream may be reused or not. The first case, when the stream is reused is working. The second one is buggy since the conn-stream refactoring and leads to a crash. In this case, the new mux don't reuse the stream. It must be silently aborted. However, its front stream connector is still referencing the connection. So it must be detached. But it must be performed in two stages, to be sure to not loose the context for the upgrade and to be able to rollback on error. So now, before the upgrade, we prepare to detach the stconn and it is finally detached if the upgrade succeeds. There is a trick here. Because we pretend the stconn is detached but its state is preserved. This patch must be backported to 2.6.
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)