How to make WordPress use protocol indepentent upload files?
You can define a function to remove the protocol and hook it to the attachment URL: function wpse_79958_remove_protocol_from_attachment($url) { $url = str_replace(array(‘http:’, ‘https:’), ”, $url); return $url; } add_filter( ‘attachment_link’, ‘wpse_79958_remove_protocol_from_attachment’ ); Also consider to use relative URLs for attachments by using WordPress builtin function wp_make_link_relative: add_filter( ‘attachment_link’, ‘wp_make_link_relative’ ); Place this code to your … Read more