This KB list all the Tech Pubs related to URL-Filtering and Cloud-Lookup

General/Info KB's

Configuration KB's

Configuring URL Filtering on the Versa FlexVNF using Versa Director
How to configure firewall rule using URL Filtering to block certain websites (criminal/pornography)
How to configure firewall rule to block traffic for shopping category
How to configure firewall rule to block traffic towards Facebook
How to Enable URL Cloud Lookup?
String and Regex pattern match for URL filtering
Configuring Custom Captive Portal