Fortinet FortiGate 1U Quick Start Manual page 63

Enabling explicit web proxy
on the internal interface
Go to System > Network > Interfaces.
Edit an internal port (port 4 in the example).
Enable both DHCP Server and Explicit
Web Proxy.
Go to System > Config > Features. Ensure
that WAN Opt. & Cache is enabled.
Setting up an explicit proxy for users on a private network 43