Set enablereuse with mod_proxy_http2

[gfrankliu]

Here is the sample config:

...

  ServerAlias *.external

  RewriteCond "%{HTTP_HOST}"   "^([-_a-z0-9]+)\.external" [NC]
  RewriteCond "%{REQUEST_URI}" "!^/static" [NC]
  RewriteRule "^/(.*)$" "h2c://%1.internal/$1" [P,NC,QSA]

...

mod_proxy_http2 doesn't seem to reuse the connections to backend servers. A quick test against server1.external causes 200+ connections to server1.internal. If I turn on enablereuse, the connections drop to < 10. For my test, I hard code below in my config:

  <Proxy "h2c://server1.internal">
    ProxySet enablereuse=on
  </Proxy>

Since my list of backend servers may change, is there a way to not hardcode every server? Can we enablereuse=on globally, or make it default? Or is there a wildcard? something like

  <Proxy "h2c://*.internal">
    ProxySet enablereuse=on
  </Proxy>

If none of above exists, where is the source can I set the default enablereuse to be on and build my own custom binary?

Thanks!