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iif() takes a boolean as input and returns one of the two argument strings depending on whether the boolean is true. This converter most likely is most useful to return the proper scheme depending on the value returned by the `ssl_fc` fetch, e.g. for use within the `x-forwarded-proto` request header. However it can also be useful for use within a template that is sent to the client using `http-request return` with a `lf-file`. It allows the administrator to implement a simple condition, without needing to prefill variables within the regular configuration using `http-request set-var(req.foo)`.
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)