Expressjs + socket.io +快递会话

我在server.js中有这个代码.

var app = require('express')(),
        session = require('express-session'),
        cookie = require('cookie'),
        cookieParser = require('cookie-parser'),
        manager = require('./sockets/manager');

var sessionStore = new session.MemoryStore();


app.use(cookieParser('secret'));
app.use(session({
    name: 'sid',
    store: sessionStore,
    secret: 'secret',
    saveUninitialized: true,
    resave: true,
    cookie: {
        path: '/',
        httpOnly: true,
        secure: false,
        maxAge: null
    }
}));

var server = require('http').Server(app).listen(8888),
    io = require('socket.io')(server);

io.use(function(socket, next) {
    var data= socket.request;

    if (data.headers.cookie) {
        data.cookie = cookie.parse(cookieParser.signedCookie(data.headers.cookie, 'secret'));

        console.log('data.cookies ( %s )', JSON.stringify(data.cookie)); 
        // print 'io=id_place', cookies doesn't have sid, why?

        if (data.cookie.sid) {
            data.sid = request.cookie.sid;
            sessionStore.get(request.cookie.sid, function(err, session) {
                request.session = session;
            });
        }
    }

    next();
});

manager.use(io);

控制台日志向我显示此cookie request.cookies({"io":"lHKSseNH5UrnJisSAAAA"}).我刚刚看到了很多使用expressjs 3和socket 0.9的例子,但我有:

"socket.io":"^ 1.0.6","express":"~4.5.1","express-session":"~1.6.4"

它不起作用.

我有什么错误吗？