title: .asp Extension Configuration in IIS
body: <p>I have installed IIS, and then browsed to a URL representing a file containing:</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;body&gt;
  &lt;%
  response.write("hello world ");
  %&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>but got this error:</p>
  
  <pre>
  Error Summary
  HTTP Error 404.3 - Not Found
  The page you are requesting cannot be served because of the extension configuration. If the page is a script, add a handler. If the file should be downloaded, add a MIME map.
  </pre>
  
  <p>What kind of extension configuration have I missed? There is also short summary:</p>
  
  <blockquote>
    <p>It is possible that a handler mapping is missing. By default, the static file handler processes all
    content. The feature you are trying to use may not be installed. The appropriate MIME map is not
    enabled for the Web site or application. (Warning: Do not create a MIME map for content that users
    should not download, such as .ASPX pages or .config files.) If ASP.NET is not installed.</p>
  </blockquote>