If you share a link to a book in social media platforms or in places like Slack, you used to get a little preview of the book name and description powered by either Open Graph meta tags or Twitter meta tags. However, those appear to have stopped working, at least on Slack and Discord, in the past week, or so.

If I navigate to a book page (eg, https://app.thestorygraph.com/books/dba55989-00a4-4727-af2d-3745ca8c5d0d) in my browser and view the source, I still see the meta tags in the HTML source. However, nothing is showing up when I share links in Slack or Discord.

I'm wondering if maybe Cloudflare is perhaps blocking these services from accessing the pages. If I curl these URLs, I get a 403 Forbidden error that appears to come from Cloudflare, so I'm wondering if maybe other services like Slack are also receiving this. Various OpenGraph checking tools also report getting nothing back (https://opengraph.dev/panel?url=https%3A%2F%2Fapp.thestorygraph.com%2Fbooks%2F9fcaffe0-7f5b-48a8-96b4-6a741cfdeb23), although Facebook's Official debugger (https://developers.facebook.com/tools/debug/) does return something, so maybe just Facebook's IPs are being allowed?

(The Facebook preview also includes an image preview, which hadn't seen before in Slack, but that would be exciting if that's now included!)

Thanks!