You're opening yourself up to a serious race condition by using a global variable ('params') to share state across requests. The delay between the GET and the s

You're opening yourself up to a serious race condition by using a global variable ('params') to share state across requests. The delay between the GET and the socket connect could easily be seconds; under load, it will likely be next to impossible to join the right room. You probably want to use cookies (which socket.io helpfully supplies) for this instead.