remoteip: add option to enable PROXY proto for specific clients only #487
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This PR implements a config directive which is effectively the opposite of the existing
RemoteIPProxyProtocolExceptions(reusing the code already in place for that). It allows PROXY protocol to be enabled for only a specific set of IPs, which can be useful for example when a webserver is both directly accessible to clients and also behind a reverse proxy.I've been using this for IPv6-only webservers where IPv6 clients connect directly but IPv4 clients go through a reverse proxy. I believe this also addresses part of bug https://bz.apache.org/bugzilla/show_bug.cgi?id=64433 which describes a similar use case.