How can I get (Express's) sessionID for a websocket connection
===

I'm using WebSockets `npm install ws` on the same port as Express is running.

I'd like to pick up the associated 'sessionID' from the HTTP connection which had just been made and upgraded to a WebSocket.


    // start express listening
    server.listen(conf.server.port, conf.server.host);
    
    var WebSocketServer = require('ws').Server
      , wss = new WebSocketServer({server: server});
    
    wss.on('connection', function(ws) {
        var sessionID = // how do I get this?
        ws.on('message', function(message) {
            console.log('received: %s', message);
        });
        ws.send('something');
    });


How can this be done?

(I currently work around the issue by sending the sessionID in the page, but this is ugly.)


