This is one of many protocol behaviors described in ActivityPub.

Identifier

urn:uuid:c274b155-edbd-4676-bbf2-4a2499accf7e

Content

Servers performing delivery to the inbox or sharedInbox properties of actors on other servers MUST provide the object property in the activity: Create, Update, Delete, Follow, Add, Remove, Like, Block, Undo.

Origin

prefix an Activity being created in an actor's outbox or inbox which references another object.

Servers performing delivery to the inbox or sharedInbox properties of actors on other servers MUST provide the object property in the activity: Create, Update, Delete, Follow, Add, Remove, Like, Block, Undo.
 
suffix Additionally, servers performing server to server delivery of the following activities MUST also provide the target property: Add, Remove.

https://www.w3.org/TR/activitypub/

JSON

{
  "id": "urn:uuid:c274b155-edbd-4676-bbf2-4a2499accf7e",
  "uuid": "c274b155-edbd-4676-bbf2-4a2499accf7e",
  "type": "Behavior",
  "content": "Servers performing delivery to the inbox or sharedInbox properties of actors on other servers MUST provide the object property in the activity: Create, Update, Delete, Follow, Add, Remove, Like, Block, Undo.\n",
  "context": [
    "https://www.w3.org/TR/activitypub/",
    {
      "name": "Server to Server Interactions",
      "id": "https://www.w3.org/TR/activitypub/#server-to-server-interactions"
    }
  ],
  "origin": {
    "source": "https://www.w3.org/TR/activitypub/",
    "section": {
      "id": "https://www.w3.org/TR/activitypub/#server-to-server-interactions",
      "branch": [
        7
      ]
    },
    "selector": {
      "type": "TextQuoteSelector",
      "prefix": "an Activity being created in an actor's outbox or inbox which references another object.\n",
      "exact": "Servers performing delivery to the inbox or sharedInbox properties of actors on other servers MUST provide the object property in the activity: Create, Update, Delete, Follow, Add, Remove, Like, Block, Undo.\n",
      "suffix": "Additionally, servers performing server to server delivery of the following activities MUST also provide the target property: Add, Remove.\n"
    }
  },
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    "https://socialweb.coop/ns/testing/context.json"
  ]
}