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The Content-Length header is always added into the request for an HTTP health-check. However, when there is no payload, this header may be skipped for OPTIONS, GET, HEAD and DELETE methods. In fact, it is a "SHOULD NOT" in the RCF 9110 (#8.6). It is not really an issue in itself but it seems to be an issue for AWS ELB. It returns a 400-Bad-Request if a HEAD/GET request with no payload contains a Content-Length header. So, it is better to skip this header when possible. This patch should fix the issue #2026. It could be backported as far as 2.2.
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)