{
  "type": "recommendation",
  "candidate_category": "book",
  "user_id": "45ac83c25d4431735267568eadb33738",
  "candidate_list": [
    "22858419",
    "6609596",
    "1020284",
    "403546",
    "1381114",
    "659998",
    "19484062",
    "23356461",
    "354073",
    "1256206",
    "18193356",
    "2125618",
    "7796273",
    "35219866",
    "24126766",
    "3020384",
    "10974849",
    "6280389",
    "13706642",
    "2320786"
  ],
  "loc": [
    -1,
    -1
  ]
}