如何获取Websocket连接的（Express）会话ID

1. 解析cookie
2. 获取会话ID
3. 获取会话数据

        var express = require('express');    var parsecookie = express.cookieParser();    var MemoryStore = express.session.MemoryStore;    var store = new MemoryStore();    app.configure(function() {        app.use(express.session({ store: store, secret: '123456', key: 'sid' }));    });    wss.on('connection', function(ws) {        parsecookie(ws.upgradeReq, null, function(err) { var sessionID = ws.upgradeReq.cookies['sid']; store.get(sessionID, function(err, session) {     // session });        });         ws.on('message', function(message) { console.log('received: %s', message);        });        ws.send('something');    });