HOWTO: forward matching URL path to external proxy?

Hi All,

I have tried to forward a certain URL path requested from clients to an external proxy located on a different subnet which is reachable. I placed the entire URL path into L7 protocol and have a Mangle rule to perform a passthrough pre-routing that marks all connection hitting this request.

The problem comes where I am not sure to use NAT or routing to forward the request towards the external proxy. Can someone enlighten me on this ? :confused: