Web Cache Communication Protocol (WCCP) is a Cisco-developed content-routing protocol that provides a mechanism to redirect traffic flows in real-time. It has built-in load balancing, scaling, fault tolerance, and service-assurance (failsafe) mechanisms.
PA obviously does not support WCCP. PBF is designed to just forward all traffic matching the PBF rule to wherever it needs to forward to. There is no connection or interaction as such with any sort of server. It just sends the traffic. I do not know much else about WCCP so cannot say if just forwarding all HTTP traffic to your WCCP server would have any problems.
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