server - Copy.js

var express = require('express');
var POSTS = {
	'1' : {
		'post' : 'This is the first blog post.'
	},
	'2' : {
		'post' : 'This is the second blog post.'
	},
	'3' : {
		'post' : 'This is the third blog post.'
	}
};

/* var handleCors = function (req, res, next) {
res.set('Access-Control-Allow-Origin', '*');
next();
}; */

var handleCors = function (req, res, next) {
	res.set('Access-Control-Allow-Origin', 'http://localhost:1111');
	if (isPreflight(req)) {
		console.log('Received a preflight request!');
		res.set('Access-Control-Allow-Methods', 'GET, DELETE');
		res.set('Access-Control-Allow-Headers', 'Timezone-Offset, Sample-Source');
		res.status(204).end();
		return;
	}
	next();
};

var SERVER_PORT = 9999;
var serverapp = express();
serverapp.use(express.static(__dirname));
serverapp.use(handleCors);
serverapp.get('/api/posts', function (req, res) {
	res.json(POSTS);
});
serverapp.listen(SERVER_PORT, function () {
	console.log('Started server at http://localhost:' + SERVER_PORT);
});

var CLIENT_PORT = 1111;
var clientapp = express();
clientapp.use(express.static(__dirname));
clientapp.listen(CLIENT_PORT, function () {
	console.log('Started client at http://localhost:' + CLIENT_PORT);
});

serverapp.get('/api/posts', function (req, res) {
	res.json(POSTS);
});
serverapp.delete ('/api/posts/:id', function (req, res) {
	delete POSTS[req.params.id];
	res.status(204).end();
});
/* serverapp.listen(SERVER_PORT, function () {
	console.log('Started server at http://localhost:' + SERVER_PORT);
}); */

var isPreflight = function (req) {
	var isHttpOptions = req.method === 'OPTIONS';
	var hasOriginHeader = req.headers['origin'];
	var hasRequestMethod = req.headers['access-control-request-method'];
	return isHttpOptions && hasOriginHeader && hasRequestMethod;
};