Proxy Servers

Most server-based filtering is based on filters integrated into proxy servers. Clients are directed through the proxy, either by explicitly setting the browser to do so, or by transparent redirection. Each request is checked, then fulfilled or redirected by the proxy server as appropriate.

Because proxies usually offer additional services, such as caching, there are often additional benefits, including bandwidth savings, access speedups, and tracking capabilities. Requests for inappropriate sites can be redirected to more appropriate sites or to a page explaining why the request was denied and offering suggestions for finding more appropriate content.