title: Failed to load resource: Preflight response is not successful
body: <p>Am trying to call CORS Rest API but am getting this error:</p>
  
  <blockquote>
    <p>Failed to load resource: Preflight response is not successful</p>
  </blockquote>
  
  <p>This happens on my cordova apps after upgrading to iOS10, before that it used to work normally!</p>
  
  <p>Here are the request/response headers, it does not complain about a specific header it only gives the above message!</p>
  
  <p><a href="https://i.stack.imgur.com/PkzDO.png" rel="noreferrer"><img src="https://i.stack.imgur.com/PkzDO.png" alt="request/response headers"></a></p>