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Created Jun 19, 2013
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cors.js Nicholas Zakas' helper method to help sort out the browser differences in CORS or Cross Origin Resource Sharing support.
function createCORSRequest(method, url) {
var xhr = new XMLHttpRequest();
if ("withCredentials" in xhr) {
// Check if the XMLHttpRequest object has a "withCredentials" property.
// "withCredentials" only exists on XMLHTTPRequest2 objects., url, true);
} else if (typeof XDomainRequest != "undefined") {
// Otherwise, check if XDomainRequest.
// XDomainRequest only exists in IE, and is IE's way of making CORS requests.
xhr = new XDomainRequest();, url);
} else {
// Otherwise, CORS is not supported by the browser.
xhr = null;
return xhr;
var xhr = createCORSRequest('GET', url);
if (!xhr) {
throw new Error('CORS not supported');
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