docs: def head(self, path=None, client_kwargs=None, header=None):
          """
          Returns object HTTP header.
  
          Args:
              path (str): Path or URL.
              client_kwargs (dict): Client arguments.
              header (dict): Object header.
  
          Returns:
              dict: HTTP header.
          """
          if header is not None:
              return header
          elif client_kwargs is None:
              client_kwargs = self.get_client_kwargs(path)
          return self._head(client_kwargs)