title: URL in get parameters returns page not found error
body: <p>I am trying to use timthumb.php for image processing on my site. When I try to pass image url to timthumb.php using:
  <code>&lt;img src="'.home_url().'/timthumb.php?src='.$image_attributes[0].'&amp;w=200"/&gt;</code>
  It returns page not found error.</p>
  
  <p><code>$image_attributes[0]</code> is the <strong>absolute URL</strong> of the image.</p>
  
  <p>When I logged in using any user account, it works perfectly but for non-logged in users it returns page not found error.</p>
  
  <p>if I pass anything else except URl or if I remove <code>http://</code>, it returns without any issue. I need to pass image URL so that I can generate thumbnails but its not working for only guest users.</p>