We probably don't need this. The default behavior is that it maps the URL to the query. But since the URL doesn't change with the same query, we don't cache it at all.

If you were thinking of not caching the response from Enervee, you can do `spice proxy_cache_valid => "418 1d";`. Default caching is 1 day. You can learn more about it here: https://dukgo.com/duckduckhack/spice_advanced_backend