json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "id": "http://localhost:9999/schemas/ticket.json",
      "type": "object",
      "properties": {
          "id": {
              "id": "id",
              "type": "integer"
          },
          "message": {
              "id": "message",
              "type": "string"
          },
          "url": {
              "id": "url",
              "type": "string"
          },
          "priority": {
              "id": "priority",
              "enum": [
                  "low",
                  "medium",
                  "high"
              ]
          }
      },
      "required": [
          "id",
          "message",
          "url",
          "priority"
      ]
  }