server.js

/**
 * Created by delwar on 4/28/16.
 */
var http = require("http");
var url = require('url');
var fs = require('fs');
var io = require('socket.io');

var server = http.createServer(function (request, response) {
  var path = url.parse(request.url).pathname;
  switch (path) {
    case '/':
      response.writeHead(200, {'Content-Type': 'text/html'});
      response.write('hello world');
      response.end();
      break;
    case '/socket.html':
      fs.readFile(__dirname + path, function (error, data) {
        if (error) {
          response.writeHead(404);
          response.write("opps this doesn't exist - 404");
          response.end();
        }
        else {
          response.writeHead(200, {"Content-Type": "text/html"});
          response.write(data, "utf8");
          response.end();
        }
      });
      break;
    case '/lib/socket.io.js':
      fs.readFile(__dirname + path, function (error, data) {
        response.writeHead(200, {"Content-Type": "text/javascript"});
        response.write(data, "utf8");
        response.end();
      });
      break;
    default:
      response.writeHead(404);
      response.write("opps this doesn't exist - 404");
      response.end();
      break;
  }

});

server.listen(8001);

var listener = io.listen(server);
listener.sockets.on('connection', function (socket) {

  setInterval(function () {
    socket.emit('sendFromServer', {'serverData': new Date()});
  }, 1000);

  socket.on('sendFromClient', function (data) {
    console.log('response from client', data.clientData);
  });

});