code: def set_cached_output(self, placeholder_name, instance, output):
          
          cachekey = self.get_output_cache_key(placeholder_name, instance)
          if self.cache_timeout is not DEFAULT_TIMEOUT:
              cache.set(cachekey, output, self.cache_timeout)
          else:
              # Don't want to mix into the default 0/None issue.
              cache.set(cachekey, output)
docs: .. versionadded:: 0.9
             Store the cached output for a rendered item.
  
             This method can be overwritten to implement custom caching mechanisms.
             By default, this function generates the cache key using :func:`~fluent_contents.cache.get_rendering_cache_key`
             and stores the results in the configured Django cache backend (e.g. memcached).
  
             When custom cache keys are used, also include those in :func:`get_output_cache_keys`
             so the cache will be cleared when needed.
  
          .. versionchanged:: 1.0
             The received data is no longer a HTML string, but :class:`~fluent_contents.models.ContentItemOutput` object.