docs: def get_aliyun_config(name, default=None):
      '''
      Get configuration variable from environment variable or
      or django settings.py
      '''
      config = os.environ.get(name, getattr(settings, name, default))
      if config is not None:
          if isinstance(config, str):
              return config.strip()
          else:
              return config
      else:
          raise ImproperlyConfigured(
              'Can not get config for {} either in environment'
              'variable or in settings.py'.format(name))