Today I tried to set up a simplified version of the network setup I described using some VirtualBox virtual machines running Ubuntu Server. It just had three machines instead of the planned six: the reverse proxy, a gameserver which also ran the MongoDB, and a LAMP server with the client files.
It turned out, apache configured as reverse proxy can not route WebSocket transparently. It strips the Upgrade line from the http headers, sabotaging the handshake.
Now I have to find another proxy server which is able to handle WebSocket.
Or maybe I just write my own reverse proxy. It can't be that difficult. Listen to socket, wait for HTTP header. when it has Upgrade:websocket, forward the tcp stream to the application server, when it hasn't, forward it to the web server. It should be possible to hack together in C in an afternoon and it will most likely be much less bloated than using the humongous Apache HTTP Server.
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