Proxy Web Servers and Authentication > Proxies for Filtering > Fake a proxy server to prevent access to all but authorized sites

3. Use a PAC file

• #2 is better, but whenever you add or remove services you have to visit every machine
• Create a Proxy Auto-Config file which only allows access to particular sites

    if (shExpMatch(host, "*eb.com") || shExpMatch(host, "*oclc.org")) {
        return "DIRECT";
      }
      
      return "PROXY www.institution.org:8080";