json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "id": "http://localhost:3000/schemas/post-device-request.json#",
      "title": "Post device request",
      "type": "object",
      "additionalProperties": false,
      "required": [
          "user_agent",
          "user_id"
      ],
      "properties": {
          "user_agent": {
              "type": "string",
              "minLength": 1
          },
          "user_id": {
              "type": "string",
              "minLength": 1
          }
      }
  }