GRPC Gateway setup example

Hi All,

I am trying to setup ISTIO Gateway with GRPC. I am using example from:https://github.com/h3poteto/istio-grpc-example.

This example does not contain Gateway. I added the Gateway:

apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  name: my-gateway
  namespace: istio-grpc-example
spec:
  selector:
    istio: ingressgateway
  servers:
  - port:
      number: 80
      name: grpc-wildcard
      protocol: GRPC
    hosts:
    - "*"

and modified the VirtualService:

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: backend
  namespace: istio-grpc-example
spec:
  hosts:
    - "backend"
  gateways:
  - my-gateway
  http:
  - match:
    - port: 50051
    route:
    - destination:
        host: backend
        subset: v0
      weight: 90
    - destination:
        host: backend
        subset: v1
      weight: 10

Is there somethig else I should do? I still cannot go through Gateway… Received an error when querying services endpoint.

Thank you!

Why are we defining gateway to listen to port 80, but defining VirtualService to match port 50051?