Reported by @Shonagon in T89552
Hello,
It seems that there are many corrupted files in the cache :
http://zone47.com/crotos/lab/cropper/get.php?q=14619165
http://zone47.com/crotos/lab/cropper/get.php?q=Q1231009
http://zone47.com/crotos/lab/cropper/get.php?q=Q19939091
Actually almost all images I tested (the one that works http://zone47.com/crotos/lab/cropper/get.php?q=21013224 )
By the way, I made a public presention in March about IIIF on Wikimedia projects at IIIF Biblissima meeting in Paris: http://www.biblissima-condorcet.fr/en/indexation-iconographique-sur-projets-wikimedia-iiif . Luckily the service worked well at that time. Many would be very happy to do more, but the instabaility of the service is today unfortunately a major obstacle to the development of IIIF in Wikimedia.
I'm sorry to say that this recurrent issue is very annoying, especially that there is no solution for users to fix it. Although my technical skills are limited, I would be happy to help if I can do something.
Best regards
Example url https://tools.wmflabs.org/zoomviewer/iiif.php?f=Chicago.jpg