A computer-implemented method for implementing URL (Uniform Resource Locator) filtering is disclosed. The method includes receiving an access request for a webpage from a client, the access request being transmitted from a gateway device via a computer network and including at least a portion of a URL for the webpage. The method also includes ascertaining a rating for the at least the webpage. The method additionally includes providing a response to the gateway device via the computer network, the response including the rating and at least a cache hint that includes at least directory block caching for caching in a directory block of a local cache, domain block caching for caching in a domain block of the local cache, and do-not-cache for not caching in the local cache.