The documentation is correct. RT does not currently use or need HTTP/2, so unless you need it for other things you are running with the same Apache, you can safely disable it. We have experimented with running with the event mpm, and as noted in the docs, it seems OK under no load. But with any traffic, the event threads don’t route requests to RT processes well, and in the worst cases RT will become unresponsive. Until we can track this down, prefork running with mod_fcgid is still the most stable configuration to run with.
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