title: 400 Bad Request not finding defined 404 error page
body: <p>If I mistype a URL for one of my sites and intentionally pull up the 400 Bad Request, I'm getting this message:</p>
  
  <blockquote>
    <p>Bad Request</p>
    
    <p>Your browser sent a request that this server could not understand.
    Additionally, a 404 Not Found error was encountered while trying to
    use an ErrorDocument to handle the request.</p>
  </blockquote>
  
  <p>which is standard and expected, except I have a 404 page setup and defined using .htaccess:</p>
  
  <pre><code>ErrorDocument 400 http://www.mywebsite.com/error
  ErrorDocument 403 http://www.mywebsite.com/error
  ErrorDocument 404 http://www.mywebsite.com/error
  </code></pre>
  
  <p>Why isn't the browser recognizing this on a 400 error? </p>
  
  <p>My 404 page is working when typing in a non-existent URL.</p>