title: How to add a default error page using httpErrors
body: <p>i have successfully added a custom 404 page. what I want to do is to create another custom error page that is displayed when there is any error other than 404. e.g. 500, 403 etc.</p>
  
  <p>this is what I have right now in webconfig</p>
  
  <pre><code>&lt;httpErrors errorMode="Custom" existingResponse="Replace"&gt;
        &lt;remove statusCode="404" subStatusCode="-1" /&gt;
        &lt;error statusCode="404" path="/404.aspx" responseMode="ExecuteURL"/&gt;
      &lt;/httpErrors&gt;
  </code></pre>