Proxy autoconfig file could be used in browser (Opera,FireFox,IE) to change the proxy dynamically.

var ALLOWED = "DIRECT"; var DISALLOWED = "PROXY 0.0.0.0:1234"; function FindProxyForURL(url, host) { if (shExpMatch(url,"*.badsite.com/*"))  {return DISALLOWED;} var currentTime = new Date();// convert the current time to minutes var now = 60*currentTime.getHours() + currentTime.getMinutes(); // Do not allow the access before […]