Pass request headers in a jquery AJAX GET call

Question

I am trying to pass request headers in an AJAX GET using jQuery. In the following block, "data" automatically passes the values in the querystring. Is there a way to pass that data in the request header instead ?

$.ajax({
         url: "http://localhost/PlatformPortal/Buyers/Account/SignIn",
         data: { signature: authHeader },
         type: "GET",
         success: function() { alert('Success!' + authHeader); }
      });

The following didn't work either

$.ajax({
         url: "http://localhost/PlatformPortal/Buyers/Account/SignIn",
         beforeSend: { signature: authHeader },
         async: false,                    
         type: "GET",
                    success: function() { alert('Success!' + authHeader); }
      });

Answer 1

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://api.jquery.com/jQuery.ajax/

http://www.w3.org/TR/XMLHttpRequest/#the-setrequestheader-method