My cross-domain jQuery.ajax calls works well. But if i make the same calls using XMLHttpRequest they dont work! (im switching from jQuery to XHR because i need to put ajax into a web worker). Ive already tried using the crossDomain parameter but it didnt work.jQuery Ajax Notes. Due to browser security restrictions, most Ajax requests are subject to the same origin policy the request can not successfully retrieve data from a different domain, subdomain, port, or protocol. That couldnt be further from the truth. All of the heavy lifting is done by the browser via the XMLHttpRequest object. jQuerys ajax is just aCORS, or Cross Origin Resource Sharing (sending cross-domain ajax requests) is actually a fairly complex topic, and there is much to discuss here. Jquery ajax cross domain. Posted on May 30, 2015 by Ambar Hasbiyatmoko. In this tutorial, we will see how to send request ajax from a server to another server.Line 1, we must add header(Access-Control-Allow-Origin: ) when using ajax for cross domain. For security reasons, we cannot make cross-domain AJAX requests with jQuery. For example, I cant call the load() method, and pass in cnn.com.Ajax XMLHttpRequest security - Duration: 1:34. Muhammad Umer Farooq 974 views. In IE6 and below, the XMLHttpRequest() is not supported, but instead relies on the proprietary ActiveXObject for Ajax requests.For cross domain Ajax requests, a "web proxy" needs to be used to first bring the data from the remote host onto the current, such as via PHPs filegetcontents Cross-domain Ajax requests ( Using the XMLHttpRequest / ActiveX object ) are not allowed in the current standard, as per the W3C specIts true that you normally cant do Ajax outside your domain due to the browsers. However using JSONP it is possible to do this. jQuery also has a jsonp param crossDomain.The ajax() method returns an object of jQuery XMLHttpRequest.