Board Thread:Technical Updates/@comment-26339491-20191203204132/@comment-3403151-20200217200045

Serving webp files when the url says .jpg and .png is by design. AND IS THE PROBLEM.

It's not a "bug", it was a design decision to intentionally allow the image server to be able to serve an image with a mime type which does not match the file extension.

Edit: Well I just wasted 30 minutes of my life wading through Wikia's spaghetti code on github to try to locate exactly where the thumbnails are generated. I suspect - but am happy to be disproven - that the source for Vignette (and "Thumblr", the thumbnail generator) is not public.