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If any DATA frame is received before all headers are fully received, a protocol error must be reported. It is required by the HTTP/2 RFC but it is also important because the HTTP analyzers expect the first HTX block is a start-line. It leads to a crash if this statement is not respected. For instance, it is possible to trigger a crash by sending an interim message with a DATA frame (It may be an empty DATA frame with the ES flag). AFAIK, only the server side is affected by this bug. To fix the issue, an protocol error is reported for the stream. This patch should fix the issue #2291. It must be backported as far as 2.2 (and probably to 2.0 too).
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)