title: PHP download gives me empty pdf
body: <pre><code>$file = "http://www.abax.se/content/download/137/862/file/example.pdf";
  header('Content-Description: File Transfer');
  header('Content-Type: application/pdf');
  header('Content-Disposition: attachment; filename='.basename($file));
  header('Content-Transfer-Encoding: binary');
  header('Expires: 0');
  header('Cache-Control: must-revalidate');
  header('Pragma: public');
  header('Content-Length: ' . filesize($file));
  flush();
  readfile($file);
  </code></pre>
  
  <p>This is the code I'm running, I'm out of ideas, any solution?</p>