Creating a CORS Request that Works on IE 8 and IE 9

gistfile1.txt

function createCORSRequest(method, url){
 var xhr = new XMLHttpRequest();
 if ("withCredentials" in xhr){
 xhr.open(method, url, true); 
 } else if (typeof XDomainRequest != "undefined"){
 xhr = new XDomainRequest(); 
 xhr.open(method, url);
 } else {
 xhr = null; 
 }
 return xhr;
}