title: Grails URL Mappings. Redirect 404 to URL e.g. http://www.mysite.com/404.html
body: <p>In my URL mappings I would like to send my application to an extrernal webpage URL for 404 errors. So, if my 404 page is hosted at <a href="http://www.myorganisation.com/404.html" rel="nofollow">http://www.myorganisation.com/404.html</a> I would like my URL mapping to be:</p>
  
  <pre><code>"404"(uri:"http://www.myorganisation.com/404.html")
  </code></pre>
  
  <p>However, this does not work. I have also tried replacing 'uri' with 'url' with no success. Is this even possible?</p>