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You can filter http content by specific categories using the FortiGuard managed web 
filtering service.

This section describes:

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FortiGuard is a managed web filtering solution provided by Fortinet. FortiGuard sorts 
hundreds of millions of web pages into a wide range of categories that users can 
allow, block, or monitor. The FortiGate unit accesses the nearest FortiGuard Service 
Point to determine the category of a requested web page and then follows the firewall 
policy configured for that user or interface.

FortiGuard includes over 60 million individual ratings of web sites applying to 
hundreds of millions of pages. Pages are rated into 56 categories that users can 
allow, block, or monitor. Categories may be added to or updated as the Internet 
evolves. Users can also choose to allow, block, or monitor entire groups of categories 
to make configuration simpler. Blocked pages are replaced with a message indicating 
that the page is not accessible according to the Internet usage policy.

FortiGuard ratings are performed by a combination of proprietary methods including 
text analysis, exploitation of the Web structure, and human raters. Users can notify 
the FortiGuard Service Points if they feel a web page is not categorized correctly, and 
new sites are quickly rated as required.

See 

 for a complete list and description of the 

FortiGuard web filter categories.

FortiGuard Service Points provide worldwide coverage. By default, the FortiGate unit 
will communicate with the closest Service Point. If the Service Point becomes 
unreachable for any reason, the FortiGate unit will contact another Service Point and 
rating information will be available within seconds. FortiGuard Service Points are 
highly scalable and new Service Points are added as required. The FortiGate unit 
communicates with the Service Point over UDP on port 8888. You can change the 
FortiGuard hostname if required, using the CLI. See