Express Middleware for CORS access.

preflightApi.js

module.exports = function preflightApi(){
 

  return function preflightApi(req, res, next){
  	//this is where the magic happens  	    
  		res.header('Access-Control-Allow-Origin', '*');
  		res.header('Access-Control-Allow-Methods', 'POST, GET, PUT, DELETE, OPTIONS');
  		res.header('Access-Control-Allow-Headers', 'User-Agent, Accept-Language, Accept-Encoding, Accept-Charset, Connection, Content-Length, Origin, Pragma, Accept-Charset, Cache-Control, Accept, Content-Type, Sessionid');
  		res.header('Access-Control-Max-Age', '1000');
  		
	if (req.method == 'OPTIONS') {
  		res.header('Content-Type',  'text/plain');
                res.writeHead(200);
  		res.end();
  	}
  	else {
  		next();
  	}
  
  }
  
};