To be able to offload HTTP inspection to a FortiWeb device you should:
1. Go to System > External Security Devices, enable HTTP Service, select FortiWeb and add the IP address of your FortiCache device.
2. Go to Policy & Objects > IPv4 Policy, add or edit a firewall policy and select Web Application Firewall. When you add Web Application Firewall to a firewall policy, web traffic accepted by the policy is offloaded to the FortiWeb device for processing.
Enabling FortiWeb on the External Security Devices page adds the following configuration to the CLI:
config system wccp set service-id 51
set router-id 18.104.22.168 (the IP address of the FortiGate interface that communicates with the FortiWeb)
set group address 0.0.0.0
set server-list 22.214.171.124 255.255.255.255 (the IP address of the FortiWeb)
set authentication disable set forward-method GRE
set return-method GRE
set assignment-method HASH
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