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w3c / activitypub

http://w3c.github.io/activitypub/
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The MIME media type `application/ld+json; profile="https://www.w3.org/ns/activitystreams"` is mandatory in ActivityStreams and optional in ActivityPub #447

Closed cristianolongoodhl closed 5 months ago

cristianolongoodhl commented 5 months ago

Please Indicate One:

Please Describe the Issue: in Section 2 of the Activity Streams 2.0 recommendation an Activity Streams Document is defined as

a JSON document whose root value is an Activity Streams Object [...] whose MIME media type is " application/activity+json".

Instead, the ActivityPub specification in Section 3.2 indicates the MIME media type application/ld+json; profile="https://www.w3.org/ns/activitystreams" as mandatory.

Considering ActivityPub as an extension of ActivityStreams2, the latter media type should be mandatory.

nightpool commented 5 months ago

This was done to add compatibility with linked data notifications, a separate standard by the W3C that was undergoing development at the same time. ActivityPub indicates that implementers should treat both MIME types interchangeably.

Unfortunately, while AFAIK no widely-deployed systems rely on the aforementioned LDN compatibility, and it seems to have been a bit of a dead-end, we cannot change the normative requirements of the spec at this time.