Use beforeSend
:
$.ajax({ url: "http://localhost/PlatformPortal/Buyers/Account/SignIn", data: { signature: authHeader }, type: "GET", beforeSend: function(xhr){xhr.setRequestHeader('X-Test-Header', 'test-value');}, success: function() { alert('Success!' + authHeader); } });
http://www.w3.org/TR/XMLHttpRequest/#the-setrequestheader-method
http://api.jquery.com/jQuery.ajax/
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