text: {
    "@context": "http://www.w3.org/ns/activitystreams#",
    "type": "Undo",
    "actor": {
      "type": "Person",
      "id": "http://example.org/sally",
      "name": "Sally"
    },
    "object": {
      "type": "Like",
      "actor": {
        "type": "Person",
        "id": "http://example.org/sally",
        "name": "Sally"
      },
      "object": {
        "id": "http://example.org/notes/1",
        "type": "Note",
        "content": "This is a note",
        "url": [{
          "type": "Link",
          "href": "http://example.org/notes/1",
          "mediaType": "text/html"
        }]
      }
    }
  }
  