Such deduplication MUST be performed by comparing the id of the activities and dropping any activities already seen.

{
  "id": "urn:uuid:37ea3238-a8a1-4731-b6b9-2134ed3bd5dd",
  "type": "Behavior",
  "uuid": "37ea3238-a8a1-4731-b6b9-2134ed3bd5dd",
  "content": "Such deduplication MUST be performed by comparing the id of the activities and dropping any activities already seen.",
  "tag": [
    {
      "name": "ActivityPubServer",
      "id": "https://socialweb.coop/tag/ActivityPubServer"
    }
  ],
  "origin": {
    "source": "https://www.w3.org/TR/activitypub/",
    "section": {
      "id": "https://www.w3.org/TR/activitypub/#inbox",
      "branch": [
        5,
        2
      ]
    },
    "selector": {
      "type": "TextQuoteSelector",
      "exact": "Such deduplication MUST be performed by comparing the id of the activities and dropping any activities already seen.\n",
      "prefix": "The server MUST perform de-duplication of activities returned by the inbox. Duplication can occur if an activity is addressed both to an actor's followers, and a specific actor who also follows the recipient actor, and the server has failed to de-duplicate the recipients list.\n",
      "suffix": "The inboxes of actors on federated servers accepts HTTP POST requests, with behaviour described in Delivery.\n"
    }
  },
  "seeAlso": [
    "urn:uuid:2a0323ec-2500-4bc3-b116-11e641035d2f"
  ],
  "@context": [
    "https://www.w3.org/ns/activitystreams",
    "https://socialweb.coop/ns/testing/context.json"
  ]
}