I'm (attempting) to build an SE chat library in Ruby, since it's one of the few languages that doesn't yet seem to have one (Brainf**k, anyone?).
As part of that, I need to make a request to http://chat.stackoverflow.com/ws-auth to get the URL for a websocket.
This route requires a roomid parameter set to the room ID, and an fkey parameter set to your user fkey.
However, with all of those things set, I get a 404 from the route (and yes, I know it exists - I've checked it with a JS console hit from the browser). I suspect it's because I'm missing a cookie or two. The only cookie I currently have/am sending for chat.stackoverflow.com is .ASPXBrowserOverride, which sounds more to do with ASPX error pages than chat's functionality. I have previously authenticated with Stack Exchange OpenID, and have the usr cookie for that, and with stackoverflow.com (using SE OpenID).
What other cookies do I need to be sending? Is there anything else I need?
