Apache Reverse Proxy for Websockets

From Mexico.purplecow.org

Handling Apache Reverse Proxy with Websockets

I first had to do this to take care of a Unifi instance.

        RewriteEngine on
        RewriteCond %{HTTP:Upgrade} websocket [NC]
        RewriteCond %{HTTP:Connection} upgrade [NC]
        RewriteRule .* "wss://localhost:8443%{REQUEST_URI}" [P]

I'm sure I cribbed the base from somewhere, but I have no idea where it might have originally come from. I'm posting it here to save someone else the pain of digging around!