By entering the following URLs into a lookup (discovery) search box in your Fediverse software, the desired object should be shown. Currently it is known that Mastodon works for cases 1 to 3.
Retrieving the ActivityPub objects requires one to perform signed GET requests.
Source code is available at codeberg.org and issues can be filed there. It might be helpful to document this mechanism in a FEP. I have written up some details on the first method here. A Gherkin feature is available here.
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Description Lookup by link tag
URL https://bovine.social/http_activitypub_test/case1
ActivityPub ID https://bovine.social/objects/8f9e37ed-557f-4511-a818-f518fecc485f
Content Test Case 1
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Description Lookup by link header
URL https://bovine.social/http_activitypub_test/case2
ActivityPub ID https://bovine.social/objects/90782cff-80fd-4fcf-a9d8-24330aa8fae8
Content Test Case 2
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Description Return ActivityPub Object
URL https://bovine.social/http_activitypub_test/case3
ActivityPub ID https://bovine.social/objects/569dfb60-92cb-4e49-92ff-489f6a594701
Content Test Case 3
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Description Redirect to ActivityPub Object
URL https://bovine.social/http_activitypub_test/case4
ActivityPub ID https://bovine.social/objects/da169826-4980-46e3-adbc-494a006980bc
Content Test Case 4