title: Ajax Request Randomly Fails
body: <p>whats hapenning is that my ajax request randomly fails, and I don't know why.</p>
  
  <p>I've been testing only in chrome and when the error callback gets called the controller returns successfully so i think that the problem is not in the server side.but i'm not sure. the responseText error in chrome is blank so i have no tip to troubleshoot.</p>
  
  <p>This is My Ajax call m I doing somehting wrong, I'm Clueless?</p>
  
  <pre><code>$.ajax({
      type: "GET",
      url: url,
      data: { postalCode: postalCode },
      dataType: "json",
      success: function (response) {
          if (isPostBack != 'True') {
              switch (response["Code"]) {
                  case "-1":
                      alert('msg 1.');
                      break;
                  case "0":
                      alert('msg 2.');
                      break;
                  case "1":
                      alert('msg 3.');
                      break;
                  case "2":
                      alert('msg 4.');
                      break;
                  default:
                      alert('unexpected value.');
              }
          }
      }
  });
  </code></pre>
  
  <p>if not what could be the most likely causes?
  I'm Developing Asp.NET MVC for Sitefinity, and I only detect this issue in this ajax request.</p>
  
  <p><strong>UPDATE:</strong></p>
  
  <p>I've detected in the browser that the request is being cancelled.
  it arrives successfully to the server and is cancelled during the code execution. it is not cancelled in a specific line because I commented the lines to find which one is causing troubles but it was cancelled regardless of the code line.
  Then I started thinking about timeout and added a timeout. first 3 seconds than 10 seconds. but the problem was still there. this is the request status:</p>
  
  <p><a href="https://i.stack.imgur.com/QsLh6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/QsLh6.png" alt="enter image description here"></a></p>