Abstract: A method and system uses an improved protocol in content request filtering, in connection with a Content Filter Server and a Content Filter Client. The number and size of messages defined by the protocol is comparatively small, to achieve significant reduction in bandwidth requirements. In one useful embodiment, wherein a requester submits a request to access content at one or more sites of a network, a method is provided for content filtering. The method includes the step of sending a Content Decision Request, that contains one or more first information elements and is limited to a single second information element, from a first location to a Content Filter Server. Each of the first information elements uniquely identifies the location of one of the requested content sites, and the second element comprises an identifier uniquely identifying the requester.