Look here:
https://www.invitehawk.com/applications/core/interface/imageproxy/imageproxy.php?img=http://41.media.tumblr.com/c20866456bb11f4765a09a1f84c895fc/tumblr_mrwn69iXjl1rj28rmo1_500.jpg&key=dbcd95f5f731e41fe7d6a8ed2f22fddf7e7f90272e73c2bb34ec9e6a8ce6b88d
this is a tumblr image, and i have blocked tumblr.
Other images have always tumblr.com, imgur.com etc…, all sites that i have blocked, but through this “imageproxy.php”, it’s possible to show everything.
This is a problem, i found that other forums use this method too, i don’t know why the use it, but they do.
I tried to insert “imageproxy.php” in the blacklist but it has no effect.
I found sites like these:
https://gist.github.com/nicoptere/a23ffae9ed51a5ca9766
https://gist.github.com/searsia/e141c4aca4ca1f3bd8a2c04877f4b26e
https://stackoverflow.com/questions/21537306/use-php-to-proxy-images
i don’t know if they can help you but i need to resolve this problem, they are dangerous as like the proxy sites.