title: Forbidden page when submit a form with an url
body: <p>few days ago i've changed host for my site, and now on the new server i have a strange error, when i submit a form with method get and an input text field with an url inside the server seem unable to find page.</p>
  
  <p>here is where i'm testing it</p>
  
  <p><a href="http://www.oscurodrago.it/tools/testserver.php" rel="nofollow">http://www.oscurodrago.it/tools/testserver.php</a></p>
  
  <p>that is an exemple of the error generated 404 forbidden page</p>
  
  <p><a href="http://www.oscurodrago.it/tools/testserver.php?u=http%3A%2F%2Fexemple.com" rel="nofollow">http://www.oscurodrago.it/tools/testserver.php?u=http%3A%2F%2Fexemple.com</a></p>
  
  <p>and that is url w/o an url</p>
  
  <p><a href="http://www.oscurodrago.it/tools/testserver.php?u=test" rel="nofollow">http://www.oscurodrago.it/tools/testserver.php?u=test</a></p>
  
  <p>do you know why it dosen't work?</p>