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When a fatal error is detected by the QUIC MUX or H3 layer, the connection should be closed with a CONNECTION_CLOSE with an error code as the reason. Previously, a direct call was used to the quic_conn layer to try to close the connection. This API was adjusted to be more flexible. Now, when an error is detected, the function qcc_set_error() is called. This set the flag QC_CF_ERRL with the error code stored by the MUX. The connection will be closed soon so most of the operations are not conducted anymore. Connection is then finally closed during qc_send() via quic_conn layer if QC_CF_ERRL is set. This will set the flag QC_CF_ERRL_DONE which indicates that the MUX instance can be freed. This model is cleaner and brings the following improvments : - interaction with quic_conn layer for closure is centralized on a single function - CO_FL_ERROR is not set anymore. This was incorrect as this should be reserved to errors reported by the transport layer to be similar with other haproxy components. As a consequence, qcc_is_dead() has been adjusted to check for QC_CF_ERRL_DONE to release the MUX instance. 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)