http://www.w3.org/Provider/Style/URI.html
http://flow-tests.wmflabs.org/w/index.php?title=Topic:Sd4yv8rsdn6x53h0 comes from https://www.mediawiki.org/wiki/Thread:Project:Support_desk/enable_compression_of_images_to_speed_up_the_page_load_%282%29 , yet http://flow-tests.wmflabs.org/w/index.php?title=Thread:Project:Support_desk/enable_compression_of_images_to_speed_up_the_page_load_%282%29 doesn't go anywhere.