Squid redirector written in python implements a dynamic whitelisting scheme. Users add new websites to the whitelist via a webform, which is user-friendly and sysadmin-friendly, but mitigates compromise and data exfiltration over the web.
...The blockpage requires use of the PHP 5.4.x CLI. In order to do HTTPS filtering, you must first install squid compiled with SSL support and configure it to talk to archangel.