title: CORS request blocked in Firefox
body: <p>I am trying to make a CORS get request to my server. My server is properly CORS enabled.</p>
  
  <p>I am sending an additional header so preflighted option call is sent by browser.</p>
  
  <p>This is working in Chrome but not in firefox. In firefox i can see the options call with 200 as return status code but the subsequent get call is not sent which is happening perfectly in Chrome</p>
  
  <p>In firefox i see these messages in console</p>
  
  <pre><code>Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://serverurl. (Reason: CORS header ‘Access-Control-Allow-Origin’ does not match ‘https://tryit.w3schools.com, *’).[Learn More]
  
  Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://serverurl. (Reason: CORS request did not succeed).[Learn More]
  </code></pre>
  
  <p>I am making XMLHttpRequest call to trigger the call.</p>
  
  <p>I am not able to figure why the call is failing in firefox</p>