I explained the problem at "Commons:Help desk" already, but got the advice to give a note here: https://commons.wikimedia.org/wiki/Commons:Help_desk#Warum_funktioniert_das_Einbinden_eines_Bildes_in_eine_externe_Website_nicht_(siehe_Beispiel)
What happens?:
All Commons pictures used on external websites did not work anymore. In my case these are far more then 100 pages with more than 700 pictures.
The cause (according to my tests) is that ‘use this file on web’ (or ‘embed’) works with image sizes such as ‘256’ or ‘512’, while technically it has obviously been changed to “250” and ‘500’! If I manually change the 256 or 512 to 250 or 500 in the ‘Embeds’ in the ‘Thumbnail Link’, it works again. With my extremely large number of affected pages from the last 10 years (which I cannot automatically adjust myself), this is extremely annoying. But even the current ‘use this file on web’ template (on German Wikimedia Commons) still offers only the old values (which no longer work) – so it is currently inoperable (no longer works). ..
What should have happened instead?:
Just changing the "use this file on web" template to the new sizes would not solve the "legacy" problem (in my case work from the last 10 years).
It would make sense for the ‘previous solutions’ in the existing world, such as my many pages, to continue to work, e.g. by redirecting the “256” link versions to the new ‘250’ versions. (This applies to the other sizes as well, of course: 512=>500, etc.) Or is there already an elegant solution for automatically changing the format in ‘externally hosted’ websites (in my case, Strato)? It would also be very unfavourable for the ‘use this file on web’ function as a whole if there were no guarantee that the integrations would continue to work in the long term and could not suddenly fail at any time (as is currently the case). Is anyone already working on a solution? Unfortunately, I am unable to do so. What does the solution will look like?
