Cody on Nostr: Because the URL doesn’t include a file extension, Jumble can’t quickly infer that ...

Because the URL doesn’t include a file extension, Jumble can’t quickly infer that it’s an image. In theory, you could solve this by sending a `HEAD` request for every URL to check the `Content-Type`, but that runs into a practical issue: a lot of these URLs are blocked by cross-origin restrictions.

Browsers simply don’t allow a webpage to fetch or inspect headers from cross-domain URLs unless the server explicitly enables CORS. I just checked `pbs.twimg.com` as well, and it has those cross-origin limitations too, so the client wouldn’t be able to reliably probe it anyway.