title: Custom 404 page sends 200 status code
body: <p>404 error page's <code>200 OK</code> header error:</p>
  
  <blockquote>
    <p>Server Response:<br>
    <a href="http://www.example.com/err404.html" rel="nofollow noreferrer">http://www.example.com/err404.html</a> HTTP<br>
    Status Code: HTTP/1.1 200 OK</p>
  </blockquote>
  
  <p>And it should give 404, my client says.</p>