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During tcp/http check rules parsing, when a sample fetch or a log-format string is parsed, the proxy's argument list used to track unresolved argument is no longer passed for default proxies. It means it is no longer possible to rely on sample fetches depending on the execution context (for instance 'nbsrv'). It is important to avoid HAProxy crashes because these arguments are resolved during the configuration validity check. But, default proxies are not evaluated during this stage. Thus, these arguments remain unresolved. It will probably be possible to relax this rule. But to ease backports, it is forbidden for now. This patch must be backported as far as 2.2. It depends on the commit "MINOR: arg: Be able to forbid unresolved args when building an argument list". It must be adapted for the 2.3 because PR_CAP_DEF capability was introduced in the 2.4. A solution may be to test The proxy's id agains NULL.
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)