title: Error: Content-Type is not allowed by Access-Control-Allow-Headers
body: <p>I am getting this error in Chrome when trying to send an ajax request:</p>
  
  <pre><code>Content-Type is not allowed by Access-Control-Allow-Headers
  </code></pre>
  
  <p>Everything works fine in Firefox. </p>
  
  <p>Can anyone help me to resolve this issue?</p>