Describe the bug

According to ActivityPub specification, servers should respond with ActivityStreams object representation to requests having application/ld+json; profile="https://www.w3.org/ns/activitystreams" in Accept header, but apparently only application/activity+json is supported

Servers ... MUST present the ActivityStreams object representation in response to application/ld+json; profile="https://www.w3.org/ns/activitystreams", and SHOULD also present the ActivityStreams representation in response to application/activity+json as well.

Steps to reproduce (if necessary)

curl -H 'Accept: application/ld+json; profile="https://www.w3.org/ns/activitystreams"' https://***/api/posts/***

The server returns the standard API response:

{
  "code": 200,
  "data": {
    ...
  }
}

Expected behavior

Server should return ActivityStreams object representation.