docs: def swagger_definition(self, base_path=None, **kwargs):
          """
          return a valid swagger spec, with the values passed.
          """
          return Swagger(
              {
                  "info": Info(
                      {
                          key: kwargs.get(key, self.DEFAULT_INFO.get(key))
                          for key in Info.fields.keys()
                          if key in kwargs or key in self.DEFAULT_INFO
                      }
                  ),
                  "paths": self.paths,
                  "swagger": "2.0",
                  "basePath": base_path,
              }
          ).to_primitive()