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The set-var() expression naturally checks whether expressions are valid in the context of the rule, but it fails to differentiate frontends from backends. As such for tcp-content and http-request rules, it will only accept frontend-compatible sample-fetches, excluding those declared with SMP_UES_BKEND (a few such as be_id, be_name). For the response it accepts the backend-compatible expressions only, though it seems that there are no sample-fetch function that are valid only in the frontend's content, so that should not cause any problem. Note that while allowing valid configs to be used, the fix might also uncover some incorrect configurations where some expressions currently return nothing (e.g. something depending on frontend declared in a backend), and which could be rejected, but there does not seem to be any such keyword. Thus while it should be backported, better not backport it too far (2.4 and possibly 2.3 only). |
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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)