json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "title": "GetConfigurationRequest",
      "type": "object",
      "properties": {
          "key": {
              "type": "array",
              "items": {
                  "type": "string",
                  "maxLength": 50
              }
          }
      },
      "additionalProperties": false
  }