title: UrlFetchApp.fetch - need HTTP response status
body: <p>I am trying to obtain the status <em>message</em> of the response to a POST to a rest service via: </p>
  
  <pre><code>var response = UrlFetchApp.fetch(&lt;url&gt;, &lt;params&gt;);
  </code></pre>
  
  <p>I need the status description as reported by the server which does not appear to be available as part of the <a href="https://developers.google.com/apps-script/reference/url-fetch/http-response" rel="nofollow">HTTPResponse</a> object returned by the fetch method.</p>
  
  <p>I can get the status code using:</p>
  
  <pre><code>response.getResponseCode();
  </code></pre>
  
  <p>But no luck on the message associated with it. I have wrapped the fetch call in a try/catch block, but the error message returned using that method is an error message provided by the spreadsheet service, not the original, raw status description from the server response.</p>
  
  <p>Any ideas on how to obtain this piece of information, most appreciated.</p>