express 4.x, Socket.IO 1.x 共享session

var express = require("express");var Server = require("http").Server;var session = require("express-session");var RedisStore = require("connect-redis")(session);var app = express();var server = Server(app);var sio = require("socket.io")(server);var sessionMiddleware = session({    store: new RedisStore({}), // XXX redis server config    secret: "keyboard cat",});sio.use(function(socket, next) {    sessionMiddleware(socket.request, socket.request.res, next);});app.use(sessionMiddleware);app.get("/", function(req, res){    req.session // Session object in a normal request});sio.sockets.on("connection", function(socket) {  socket.request.session // Now it's available from Socket.IO sockets too! Win!});server.listen(8080);