Facebook posting issue through Cloudflare

When proxying through Cloudflare and trying to post a URL from my site on Facebook it appears Facebook thinks there’s a 404:

However, when proxying through Cloudflare is turned off (DNS only) then Facebook is able to scrape the page just fine (HTTP code 200), and the page’s content is shown correctly.

Any ideas as to why Facebook posting gets a 404 error when proxying through Cloudflare?

Thanks. -Dan

  1. Definitely check your server log to see why it’s getting a 404. That should provide a pretty big hint.
  2. I see part of the message says it’s missing fb:app_id. Any idea where that comes from?

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