Known bookmark

{
  "object": {
    "id": false,
    "content": "",
    "formattedContent": "",
    "displayName": "",
    "objectType": "bookmark",
    "published": "1970-01-01T00:00:00+00:00",
    "url": "https:\/\/stream.jeremycherfas.net\/like\/edit\/",
    "actor": {
      "id": "http:\/\/stream.jeremycherfas.net\/profile\/jeremy",
      "content": "",
      "formattedContent": "",
      "displayName": "Jeremy Cherfas",
      "objectType": "person",
      "published": "2017-02-11T13:24:55+00:00",
      "url": "https:\/\/stream.jeremycherfas.net\/profile\/jeremy",
      "image": {
        "url": "https:\/\/stream.jeremycherfas.net\/file\/5323e86f4819ad962c270ffe7abdb3f4"
      }
    }
  },
  "url": false,
  "value": null,
  "wordcount": false,
  "class": "wysiwyg-short",
  "height": 250,
  "placeholder": "Add notes to your bookmark...",
  "label": "Description",
  "services": {
    "twitter": [
      {
        "username": "EatPodcast",
        "name": "EatPodcast"
      }
    ]
  },
  "content_type": "bookmark",
  "posseLinks": [
    
  ],
  "disabled": "",
  "details": {
    "username": "EatPodcast",
    "name": "EatPodcast"
  },
  "selected": false,
  "action": "\/like\/edit",
  "time": 1504589159,
  "title": "New bookmark",
  "messages": [
    
  ]
}

Sending this:

  ["body"]=>
  string(237) "["https:\/\/www.tbray.org\/ongoing\/When\/201x\/2017\/09\/03\/Murder-chez-Hitler","PESOS from reading.am<\/a>"]"

Results in an error message: {"messages":[{"message":"That doesn't look like a valid URL.","message_type":"alert-danger"}]}