At this point just a reminder, I might look for it myself:
the config generated for me tries LoadModule for mod_proxy_http2 before mod_proxy and fails, because it can't find the symbol mod_proxy. I guess we need to ensure, that the LoadModule lines we generate for httpd.conf put mod_proxy_http2 after the one for mod_proxy. The current other proxy modules are already behind mod_proxy.
Regards, Rainer
