io.configure(function () {
io.set("transports", [
'websocket'
, 'xhr-polling'
, 'jsonp-polling'
, 'flashsocket'
]);
io.set("polling duration", 10);
});

Link to doc https://github.com/LearnBoost/socket.io-spec#transport-id

var express = require("express");
var app = express();
var port = process.env.PORT || 3700;
var io = require('socket.io').listen(app.listen(port));
var Instagram = require('instagram-node-lib');
var http = require('http');
var request = ('request');
var intervalID;

/**

• Set the paths for your files
• @type {[string]}
  */
  var pub = __dirname + '/public',
  view = __dirname + '/views';

/**

• Set the 'client ID' and the 'client secret' to use on Instagram
• @type {String}
  */
  var clientID = '41e187d89f4b42b784804e0981f30c11',
  clientSecret = '362ceaa9c63d4f7cbab7964919c9b4f2';

/**

• Set the configuration
  */
  Instagram.set('client_id', clientID);
  Instagram.set('client_secret', clientSecret);
  Instagram.set('callback_url', 'http://instagram-auto.herokuapp.com/callback');
  Instagram.set('redirect_uri', 'http://instagram-auto.herokuapp.com/');
  Instagram.set('maxSockets', 10);

/**

• Uses the library "instagram-node-lib" to Subscribe to the Instagram API Real Time
• with the tag "hashtag" lollapalooza
• @type {String}
  */
  Instagram.subscriptions.subscribe({
  object: 'tag',
  object_id: 'sunset',
  aspect: 'media',
  callback_url: 'http://instagram-auto.herokuapp.com/callback',
  type: 'subscription',
  id: '#'
  });

// if you want to unsubscribe to any hashtag you subscribe
// just need to pass the ID Instagram send as response to you
Instagram.subscriptions.unsubscribe({ id: '3668016' });

// https://devcenter.heroku.com/articles/using-socket-io-with-node-js-on-heroku
io.configure(function () {
io.set("transports", ["xhr-polling"]);
io.set("polling duration", 10);
});

/**

• Set your app main configuration
  */
  app.configure(function(){
  app.use(express.bodyParser());
  app.use(express.methodOverride());
  app.use(app.router);
  app.use(express.static(pub));
  app.use(express.static(view));
  app.use(express.errorHandler());
  });

/**

• Render your index/view "my choice was not use jade"
  */
  app.get("/views", function(req, res){
  res.render("index");
  });

// check subscriptions
// https://api.instagram.com/v1/subscriptions?client_secret=YOUR_CLIENT_ID&client_id=YOUR_CLIENT_SECRET

/**

• On socket.io connection we get the most recent posts
• and send to the client side via socket.emit
  */
  io.sockets.on('connection', function (socket) {
  Instagram.tags.recent({
  name: 'sunset',
  complete: function(data) {
  socket.emit('firstShow', { firstShow: data });
  }
  });
  });

/**

• Needed to receive the handshake
  */
  app.get('/callback', function(req, res){
  var handshake = Instagram.subscriptions.handshake(req, res);
  });

/**

• for each new post Instagram send us the data
  */
  app.post('/callback', function(req, res) {
  var data = req.body;

  // Grab the hashtag "tag.object_id"
  // concatenate to the url and send as a argument to the client side
  data.forEach(function(tag) {
  var url = 'https://api.instagram.com/v1/tags/' + tag.object_id + '/media/recent?client_id=479edbf0004c42758987cf0244afd3ef';
  sendMessage(url);

  });
  res.end();
  });

/**

• Send the url with the hashtag to the client side
• to do the ajax call based on the url
• @param {[string]} url [the url as string with the hashtag]
  */
  function sendMessage(url) {
  io.sockets.emit('show', { show: url });
  }

console.log("Listening on port " + port);