Acheiving CORS via a Node HTTP Server

cors.js

// Create our server
var server;
server = http.createServer(function(req,res){
	// Set CORS headers
	res.setHeader('Access-Control-Allow-Origin', '*');
	res.setHeader('Access-Control-Request-Method', '*');
	res.setHeader('Access-Control-Allow-Methods', 'OPTIONS, GET');
	res.setHeader('Access-Control-Allow-Headers', '*');
	if ( req.method === 'OPTIONS' ) {
		res.writeHead(200);
		res.end();
		return;
	}

	// ...
});

Failing that:

If you using Chrome and your not sure what headers are being requested, use the Developer Console, Network select the call being made and you can view what headers are being requested by Access-Control-Request-Headers

(http://stackoverflow.com/questions/32500073/request-header-field-access-control-allow-headers-is-not-allowed-by-itself-in-pr)

e.g.: res.setHeader('Access-Control-Allow-Headers', 'authorization, content-type');

This did it, finally. Thanks +1(000)!