title: What are the possible values for `jqXHR.status`?
body: <p>What are the possible values for <code>jqXHR.status</code>?</p>
  
  <p>So far, I can see the following:</p>
  
  <pre><code>if (jqXHR.status === 0) { msg = 'Network Problem'; }
  else if (jqXHR.status == 404) { msg = 'Requested page not found. [404]'; }
  else if (jqXHR.status == 500) { msg = 'Internal Server Error [500].'; }
  </code></pre>