trouble with is_ajax_request()

X-Requested-With is set only by AJAX libraries like jQuery, Mootools, Prototype etc.

If you're using a custom AJAX handler and want this functionality, you can trigger the request header by adding
the following AFTER you've opened the request with .open():

xmlHttpRequestObject.setRequestHeader('X-Requested-With', 'XMLHttpRequest');

What did you Try? What did you Get? What did you Expect?

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