Issues with proxies blocking web sockets

[azeemba]

From my internet at work, I see this a lot:
WebSocket connection to 'ws://wikimon.hatnote.com:9000/' failed: Error during WebSocket handshake: Unexpected response code: 407

I think something to consider is switching to socket.io. Socket.io cleanly falls back to alternate protocols in case websockets fail to work for whatever reason.

[JamesCullum]

Same here:
app.js:160 Connection Error to de: [object Event] /#de,en:1 WebSocket connection to 'ws://wikimon.hatnote.com:9000/' failed: WebSocket is closed before the connection is established.

[hugolpz]

See also #48