How to force IIS to throw an exception
<p>From this <a href="https://stackoverflow.com/a/18404091/24267">https://stackoverflow.com/a/18404091/24267</a> I gather that </p>

<blockquote>
  <p>The customErrors attribute is used when the .net code is throwing an
  exception (404, 403, 500 etc) and the httpErrors attribute is used
  when IIS itself is throwing an exception.</p>
</blockquote>

<p>I want QA to be able to test my 500 page.  It's easy enough to throw an asp.net exception to test customErrors ("throw new Exception()" in an .aspx page), but how do I force IIS to throw an exception to test httpErrors?</p>