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When the sample validity flags are computed to check if a sample is used in a valid scope, the flags depending on the proxy capabilities must be cumulated. Historically, for a sample on the request, only the frontend capability was used to set the sample validity flags while for a sample on the response only the backend was used. But it is a problem for listen or defaults proxies. For those proxies, all frontend and backend samples should be valid. However, at many place, only frontend ones are possible. For instance, it is impossible to set the backend name (be_name) into a variable from a listen proxy. This bug exists on all stable versions. Thus this patch should probably be backported. But with some caution because the code has probably changed serveral times. Note that nobody has ever noticed this issue. So the need to backport this patch must be evaluated for each branch.
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)