code: def get_cached_response(self, key):
          
          cached_value = self.data.get(key, _CACHE_MISS)
          is_found = cached_value is not _CACHE_MISS
          return CachedResponse(is_found, key, cached_value)
docs: Retrieves a CachedResponse for the provided key.
  
          Args:
              key (string)
  
          Returns:
              A CachedResponse with is_found status and value.