code: def _server_error_handler(self, code: int):
          
          if code == 501:
              self._login_fut.set_result(False)
          else:
              self.clean()
              raise abort(code)
          return True
docs: 处理500~599段状态码,抛出对应警告.
  
          Parameters:
              (code): - 响应的状态码
  
          Return:
              (bool): - 已知的警告类型则返回True,否则返回False
  
          Raise:
              (ServerException): - 当返回为服务异常时则抛出对应异常