CORS – Cross-Domain AJAX Without JSONP By Allowing Origin On Server

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There is no need to use JSONP if you enable CORS. 

Access-Control-Allow-Origin: http://www.example.com

if this header is set in the response, then normal XmlHttpRequest will be able to access the response as if it is like same domain. Check whether this header is set correctly.

I hope that this link will help you if you are using jquery A CORS POST request works from plain javascript, but why not with jQuery?

Update:
Example 

var xmlhttp= new XMLHttpRequest();
var url="https://developer.mozilla.org/en-US/docs/HTTP/Access_control_CORS?redirectlocale=en-US&redirectslug=HTTP_access_control";
xmlhttp.open("GET",url,false);
xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
xmlhttp.send();

Try this in any domain, you will get response.

Update solution:

Request url without “http://” caused the problem, prepending “http://” solved the issue

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