Apache Reverse Proxy

Has anyone had any success doing this? I can connect, but I get the spinning loading circle indefinitely.

I’ve tried with and without the parameters that are commented out. What am I missing?

This is inside of a virtual host config:

        ProxyPreserveHost On
        ProxyRequests On

        ProxyPass          /
        ProxyPassReverse   /
        SSLProxyEngine On

#       ProxyHTMLURLMap https://volumio.mydomain.com/

 #       Header set Host volumio.mydomain.com
 #       RequestHeader set Host
 #       Header unset Referer
 #       RequestHeader unset Referer

Any suggestions appreciated. Thanks!