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[Bug report] Lemmy CA rich link previews for some posts show the captcha challenge, not actual content (lemmy.ca)

submitted 11 months ago by CrashLoopBackOff@lemmy.ca to c/lemmy_ca_support@lemmy.ca

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Link posts from thetyee.ca appear to be previewing the Cloudflare captcha challenge "Attention Required! | Cloudflare" prompt instead of actual content.

What it looks like (two examples - this seems to be a consistent problem for thetyee):

(from https://lemmy.ca/post/39053782)

(from https://lemmy.ca/post/39058782)

What it should look like (a different post):

My guess is that the rich link preview is generated in Lemmy's backend, and Cloudflare thinks that the IP address of lemmy.ca's host is full of bots.

No educated guess on the solution, though, but I'd guess that other Lemmy admins have seen sort of thing too.

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[–] CrashLoopBackOff@lemmy.ca 1 points 11 months ago

Lemmy mainline could also skip rich link preview generation if it returns a non-2xx status. Have a few retries if link preview generation fails, and omit the preview entirely if retries are exhausted. I think the Attention Required! | Cloudflare prompt is associated with a 403 Forbidden status code.

And also generate some logs of what addresses are being refused, so the Lemmy admins can reach out to the content owners and get their servers unblocked, maybe.