title: wkhtmltopdf - no pdf only error in log
body: <p>I try to use wkhtmltopdf with drupal.</p>
  
  <p>Via terminal I can make a pdf of a certain website. But if I try to make a pdf of my drupal content I got a page refesh an this error.. I'm wondering what this error means..</p>
  
  <p>wkhtmltopdf: Loading pages (1/6) [> ] 0% [======> ] 10% [======> ] 11% Error: Authentication Required [============================================================] 100% Error: Failed loading page file:///tmp/wktemp-b02df673-db7f-4683-99ae-68ce16ec7ab6.html (sometimes it will work just to ignore this error with --load-error-handling ignore)</p>