Automatic Proxy Configuration

• a javascript that tells the browser when to use the proxy server
  • contains same list of IP addresses we give to resource providers
  • contains the host names of all the IP filtered sites we subscribe to
  • the browser compares its IP address, and the requested URL, against both of these lists to determine how to route the request
  • executed for every request - there is a slight impact on browser responsiveness.
• stored on our web site, without access restrictions
  • web browsers must be able to access the APC file before they are authenticated