code: def base_path(self):
      
      path = self.request.path
      base_path = path[:path.rfind("/")]
      if not base_path.endswith("/command"):
        raise BadRequestPathError(
            "Json handlers should have /command path prefix")
      return base_path[:base_path.rfind("/")]
docs: Base path for all mapreduce-related urls.
  
      JSON handlers are mapped to /base_path/command/command_name thus they
      require special treatment.
  
      Raises:
        BadRequestPathError: if the path does not end with "/command".
  
      Returns:
        The base path.