title: Missing Documentation for web.config for a Node.js application on Azure Website
body: <p>I'm running a Node.js server as API for my mobile app on a Windows Azure Website. And I'm having some trouble with it due to the needed web.config - but I couldn't find any really helpful documentation about it. Everything I can find is googling for specific problems on it and with a bit luck I can use the config snippets.</p>
  
  <ul>
  <li>is there any general documentation about the contents the web.config can contain and their meaning?</li>
  <li>in the start I had the problem that errors were modified by IIS to a general error. But since it's a REST API I want the HTTP status codes to be returned. I got around that with the <code>&lt;httpErrors existingResponse="PassThrough" /&gt;</code> element, but it doesn't seem to work for every error.</li>
  </ul>
  
  <p>The only documentation I found so far are example configuration files of the iisnode module.</p>