Brainstorming

• Thumbnail extraction definitely happens in the backend.
  • But when does it happen?
  • Only when creating the post?
  • Or also when federating a post to a new instance?
  • PR which replaced iframely ➡ https://github.com/LemmyNet/lemmy/pull/1706
  • Now backend uses fetch_site_metadata ➡ https://github.com/LemmyNet/lemmy/blob/main/crates/api_common/src/request.rs
  • … which evaluates the opengraph (og:*) meta tags from a linked HTML document whenever a post is created or updated
• Thumbnails do neither work on lemmy.wtf nor lemmy.world but work on feddit.de
  • Does feddit.de extract the missing thumbnail when creating/updating the post? ➡ Yes, I think so
  • Or does it expect the thumbnail to be transmitted alongside the post? ➡ No, I don’t think so
• lemmy.world does not use cloudflare (I think) but they are also (like lemmy.wtf) using docker (I think)

Also Not Working on lemmy.world

• https://lemmy.world/c/music

But does on feddit.de

• https://feddit.de/c/[email protected]

It’s not only YT thumbnails which aren’t shown. This is your post about the free 24 slot bag as shown on lemmy.wtf (no thumbnail), lemmy.world (no thumbnail) and feddit.de (with thumbnail):

• https://lemmy.wtf/post/452
• https://lemmy.world/post/78622
• https://feddit.de/post/809185