sockect.io difference between creating http server and not creating http

Question

sockect.io difference between creating http server and not creating http

I am trying to create a new notifier system using nodejs, for that i am using socket.io. what is the difference between the below two codings.

Coding 1: //Created a HTTP server and Socket connection

var app = require('express').createServer() 
var io = require('socket.io').listen(app); 
app.listen(8080);

Coding 2: //only created Socket connection

var io = require('socket.io').listen(8080);

Please suggest?

node.js
express
websocket
socket.io

Answer 1

There is no real difference. The latter is merely a shortcut for the former.

One tiny difference does exist though: The shortcut will add a default HTTP request handler (for non-websocket requests) that responds with Welcome to socket.io..