Node.js connect 介绍
connect 是 Node.js 的中间件，捆绑了超过 18 个中间件，同时还提供丰富的第三方中间件。
示例代码：
var connect = require('connect');
var http = require('http');
var app = connect();
// gzip/deflate outgoing responses
var compression = require('compression');
app.use(compression());
// store session state in browser cookie
var cookieSession = require('cookie-session');
app.use(cookieSession({
keys: ['secret1', 'secret2']
}));
// parse urlencoded request bodies into req.body
var bodyParser = require('body-parser');
app.use(bodyParser.urlencoded({extended: false}));
// respond to all requests
app.use(function(req, res){
res.end('Hello from Connect!\n');
});
//create node.js http server and listen on port
http.createServer(app).listen(3000);