curl -i -X GET "https://api.box.com/2.0/tasks/12345" \
     -H "authorization: Bearer <ACCESS_TOKEN>"

{
  "id": "11446498",
  "type": "task",
  "item": {
    "id": "12345",
    "type": "file",
    "etag": "1",
    "sequence_id": "3",
    "name": "Contract.pdf",
    "sha1": "85136C79CBF9FE36BB9D05D0639C70C265C18D37",
    "file_version": {
      "id": "12345",
      "type": "file_version",
      "sha1": "134b65991ed521fcfe4724b7d814ab8ded5185dc"
    }
  },
  "due_at": "2012-12-12T10:53:43-08:00",
  "action": "review",
  "message": "Legal review",
  "task_assignment_collection": {
    "total_count": 100,
    "entries": [
      {
        "id": "11446498",
        "type": "task_assignment",
        "item": {
          "id": "12345",
          "type": "file",
          "etag": "1",
          "sequence_id": "3",
          "name": "Contract.pdf",
          "sha1": "85136C79CBF9FE36BB9D05D0639C70C265C18D37",
          "file_version": {
            "id": "12345",
            "type": "file_version",
            "sha1": "134b65991ed521fcfe4724b7d814ab8ded5185dc"
          }
        },
        "assigned_to": {
          "id": "11446498",
          "type": "user",
          "name": "Aaron Levie",
          "login": "ceo@example.com"
        },
        "message": "Please review",
        "completed_at": "2012-12-12T10:53:43-08:00",
        "assigned_at": "2012-12-12T10:53:43-08:00",
        "reminded_at": "2012-12-12T10:53:43-08:00",
        "resolution_state": "incomplete",
        "assigned_by": {
          "id": "11446498",
          "type": "user",
          "name": "Aaron Levie",
          "login": "ceo@example.com"
        }
      }
    ]
  },
  "is_completed": true,
  "created_by": {
    "id": "11446498",
    "type": "user",
    "name": "Aaron Levie",
    "login": "ceo@example.com"
  },
  "created_at": "2012-12-12T10:53:43-08:00",
  "completion_rule": "all_assignees"
}