Oneboxing Discourse links

We’ve recently lost the ability to onebox links to other threads and posts within our installation. I can see this working on meta, so am assuming this isn’t a regression.

Are there any gotchas/known issues that can lead to failures? Are there any other sites using Discourse+SSL+Cloudflare?

Last time we looked this was due to internal DNS failing on your instance.

(Applies only to external oneboxing, now that I have read your post more closely)

Perhaps the link goes to a topic with restricted permissions or it is from a non-public category?

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Indeed, I’m being daft and forgot that it doesn’t work for secured categories, even if the post is in the same secure category.

Is that behaviour likely to change @codinghorror?