Thumbnail metatag not working in Synapse

[joepie91]

Synapse isn't detecting the og:image (and similar) metatags for some reason. The other metatags are processed correctly. Possibly something to do with the uppercase .JPG extension?

[Peetz0r]

Nope, we now think it may be because the content-type is missing.

It works when I proxy trough Caddy, which somehow automagically adds a content-type header.

See also https://matrix.to/#/!HguitypRcaLhKzXJbP:pixie.town/$9ry7nsNAregHw-MVKBGC84wFxT_g9rpfECpq8wGpO5Y?via=pixie.town&via=matrix.org&via=glitch.im

Credits to @lieuwex