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Historically, the ADDR pseudo-type did not exist. So when IPV6 support
was added to existing IPV4 sample fetches (e.g.: src,dst,hdr_ip...) the
expected out_type in related sample definitions was left on IPV4 because
it was required to declare the out_type as the lowest common denominator
(the type that can be casted into all other ones) to make compatibility
checks at parse time work properly.
However, now that ADDR pseudo-type may safely be used as out_type since
("MEDIUM: sample: add missing ADDR=>? compatibility matrix entries"), we
can use ADDR for fetches that may output both IPV4 and IPV6 at runtime.
One added benefit on top of making the code less confusing is that
'haproxy -dKsmp' output will now show "addr" instead of "ipv4" for such
fetches, so the 'haproxy -dKsmp' output better complies with the fetches
signatures from the documentation.
out_ip fetch, which returns an ip according to the doc, was purposely
left as is (returning IPV4) since the smp_fetch_url_ip() implementation
forces output type to IPV4 anyway, and since this is an historical fetch
I prefer not to touch it to prevent any regression. However if
smp_fetch_url_ip() were to be fixed to also return IPV6 in the future,
then its expected out_type may be changed to ADDR as well.
Multiple notes in the code were updated to mention that the appropriate
pseudo-type may be used instead of the lowest common denominator for
out_type when available.
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)