title: How to Dict.get a case insensitive key?
body: <p>I'd like to grab the <code>Total-Records</code> key of a <code>response.headers</code> HTTP response.</p>
  
  <p>Problem is that in some browser it is as returned by the server <code>Total-Records</code> but in some other, it is in lower case.</p>
  
  <p>I'd like to get the value of the <code>Total-Records</code> header regardless of its case.
  How would you do that?</p>