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Instead of using the same proxy as other http client calls (through lua for instance), the OCSP update will use a dedicated proxy which will enable it to change the log format and log conditions (for instance). This proxy will have the NOLOGNORM option and regular logging will be managed by the update task itself because in order to dump information related to OCSP updates, we need to control the moment when the logs are emitted (instead or relying on the stream's life which is decorrelated from the update itself). The update task then calls sess_log directly, which uses a dedicated ocsp logformat that fetches specific OCSP data. Sess_log was preferred to the more low level app_log because it offers the strength of "regular" sample fetches and allows to add generic information alongside OCSP ones in the log line. In case of connection error (unreachable server for instance), a regular httpclient log line will also be emitted. This line will have some extra HTTP related info that can't be provided by the ocsp update logging mechanism.
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)