#### return
var http = require('http-res-redirect');

* it returns a http object;
* you only need change require('http) to require('http-res-redirect');

$3

app.use('/redirect',(req,res,next) => {
res.redirect(301,'/hello');
// statusCode 302 by default
res.redirect('/hello');
//res.redirect('http://www.google.com');
})

app.use('/hello',(req,res,next) => {
res.end('hello world');
})

var server = http.Server(app);

* The res is an instance of http.ServerResponse, so we can append a redirect property to http.ServerResponse.prototype, like: