Apache

To use the Xpra html5 client from behind an Apache proxy, start an xpra server listening on a TCP port, ie:

xpra start :100 --start-child=xterm --bind-tcp=0.0.0.0:14500

And add the following configuration to apache:

<Location "/xpra">

  RewriteEngine on
  RewriteCond %{HTTP:UPGRADE} ^WebSocket$ [NC]
  RewriteCond %{HTTP:CONNECTION} ^Upgrade$ [NC]
  RewriteRule .* ws://localhost:14500/%{REQUEST_URI} [P]

  ProxyPass ws://localhost:14500
  ProxyPassReverse ws://localhost:14500

  ProxyPass http://localhost:14500
  ProxyPassReverse http://localhost:14500
</Location>

Make sure to reload the server to update the configuration.

If you are not using the default connect dialog page, you may need to override the "path" option.