code: def save_session_to_file(self, filename: Optional[str] = None) -> None:
          
          if filename is None:
              filename = get_default_session_filename(self.context.username)
          dirname = os.path.dirname(filename)
          if dirname != '' and not os.path.exists(dirname):
              os.makedirs(dirname)
              os.chmod(dirname, 0o700)
          with open(filename, 'wb') as sessionfile:
              os.chmod(filename, 0o600)
              self.context.save_session_to_file(sessionfile)
              self.context.log("Saved session to %s." % filename)
docs: Saves internally stored :class:`requests.Session` object.
  
          :param filename: Filename, or None to use default filename.