It seems that some theme stuff (like the favicon and the logo and probably unaggregated CSS/JS) is passed as Drupal paths into file_create_url while aggregated CSS and JS is served from public://. So we need to implement file_url_alter and override the getExternalUrl of the DrupalPublicWrapper class
Except where otherwise noted, content on this site is licensed under a Creative Commons Attribution 3.0 Unported License.