client.js

// Send cookies for the socket.io handshake (sails.js)
// Based on https://gist.github.com/jfromaniello/4087861
// Socket.io open ticket (started by jfromaniello):
// https://github.com/LearnBoost/socket.io-client/pull/512

var io = require('socket.io-client');
var request = require('request');
var xhr = require('socket.io-client/node_modules/xmlhttprequest');
var xhrOriginal = require('xmlhttprequest');

var myUrl = 'http://192.168.56.101:1337';
var cookieJar = request.jar();

// From socket.io-client's module 'xmlhttprequest', rewrie its XMLHttpRequest function.
xhr.XMLHttpRequest = function() {
	this.XMLHttpRequest = xhrOriginal.XMLHttpRequest;
	xhrOriginal.XMLHttpRequest.apply(this, arguments);
	this.setDisableHeaderCheck(true); // Allow header modifications.
	
	// Rewrite the 'open' function.
	var openOriginal = this.open;
	this.open = function(method, url, async, user, password) {
		openOriginal.apply(this, arguments);
		var header = cookieJar.get({url: myUrl}).map(function(cookie) {
			return cookie.name + '=' + cookie.value;
		}).join('; ');
		this.setRequestHeader('cookie', header);
	};
};

// Send the cookie first before attempting to connect via socket-io,
// thus, avoiding the handshake error.
request.post({jar: cookieJar, url: myUrl}, function(err, resp, body) {
	var socket = io.connect(myUrl);
	socket.on('connecting', function() {
		console.log('(II) Connecting to server');
	});
	socket.on('connect', function() {
		console.log('(II) Successfully connected to server');
	});
	socket.on('error', function(reason) {
		console.log('(EE) Error connecting to server: ' + reason);
	});
	socket.on('disconnect', function(reason) {
		console.log('(II) Disconnected from server\n');
	});
});