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@trwnh @julian @thisismissem @silverpill In any case I don’t think “origin based authentication” for fetches is a good idea for the simple reason that its not, to my knowledge, what implementations do today and it strongly risks leaking private posts. Certainly what the ActivityPub spec heavily implies if not outright says is that anything fetchable via a given identity should be visible to that identity, and I’m generally iffy on the idea of trying to make implementations execute potentially complicated ACLs on behalf of each other; that way is certainly a security disaster.

So that then leaves us with the question: is leaking the identity of the actor who has pasted a post’s URL into their instance’s search bar a real issue?