title: Change http status 503 to 200 when serving app_offline.htm for specific URL
body: <p>The app_offline.htm file that ASP.NET serves returns the http status 503.  This is the correct behavior for most situations.  However, in the scenario where a specific URL is requested (e.g. <a href="https://www.mywebsite.com/monitor">https://www.mywebsite.com/monitor</a>), I'd like to change the returned http status to 200, while still returning http status 503 in all other situations.  Is this possible?</p>
  
  <p>The reason why I want to do this is whenever we do scheduled maintenance on our website, we use the app_offline.htm file, but we don't want our uptime monitoring service (Pingdom.com) to report downtime during our scheduled maintenance.</p>
  
  <p>I assume this would have to be at the IIS level because the app_offline.htm gets served very early on in the request processing cycle.</p>