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h3_resp_trailers_send() may be called due to an HTX EOT block present without preceeding HTX TRAILER block. In this case, no HEADERS frame will be generated by H3 layer and MUX will emit an empty STREAM frame with FIN set. However, before skipping these, some operations are conducted on qcs buffer to realign it and try to encode the QPACK field section line in a buffer copy. These operation are thus unneeded if no trailer is generated. Even worse, the function will fail if there is not enough space in the buffer for the superfluous QPACK section line. To improve this situation, this patch adds an early goto statement to skip most operations in h3_resp_trailers_send() if no HTX trailer block is found. This patch is related to github issue #2006. This should be backported up to 2.7.
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)