easy_chat_app_01.js

var express = require('express');
var app = express();
app.use(express.static('public')); 
var http = require('http').Server(app);
var port = process.env.PORT || 3001;

var io = require('socket.io')(http);
 
io.on('connection', function(socket) {
    console.log('new connection');
    socket.on('message', function(msg) {
        console.log('Got message from client: ' + msg);     
    });
});

app.get('/', function(req, res) {
  res.sendFile(__dirname + '/public/default.html');
});

http.listen(port, function() {
  console.log('listening on *: ' + port);
});