You can add web caching to a WAN optimization topology when users on a private network communicate with web servers located across the WAN on another private network.

The topology in Figure 317 is the same as that of Figure 313 with the addition of web caching to the FortiGate unit in front of the private network that includes the web servers. You can also add web caching to the FortiGate unit that is protecting the private network. In a similar way, you can add web caching to all of the topologies shown in “WAN optimization topologies”.