code: def load_swagger_spec(self, filepath=None):
          
          if filepath is True or filepath is None:
              filepath = self.file_spec.format(server=self.server)
  
          return json.load(open(filepath))
docs: Loads the origin_spec from a local JSON file.  If `filepath`
          is not provided, then the class `file_spec` format will be used
          to create the file-path value.