I installed knative-serving on a GKE cluster following those instruction below:
It works through external-ip of the istio-ingressgateway. However I want to make the knative-serving as a backend service of a HTTP(S) Load balancer.
I can create an Internet network endpoint group containing the external-ip of istio-ingressgateway. It works, but you know, it is not a best way I think.
I found this article, but I think it is not up to dated. I didn't tried. https://cloud.google.com/solutions/integrating-https-load-balancing-with-istio-and-cloud-run-for-anthos-deployed-on-gke
Maybe there is a way to proxy request from a service of standalone NEG to istio-ingressgateway, but I'm not sure.