istio gateway, not loading the node application

I have tried to deploy a sample nginx app and it working. So, I replaced the same with another nodejs as this contains mutliple sub pages. So, I can test the routing.

Here, with LoadBalancer default service type, the page is loading as below.

But, with istio gateway, it is just showing an empty page.

Please suggest how to fix that?

My gateway:

apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  name: sampleserver-gateway
spec:
  selector:
    istio: ingressgateway # use istio default controller
  servers:
  - port:
      number: 80
      name: http
      protocol: HTTP
    hosts:
    - "*"

My virtualservice:

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: nginxserver
spec:
  hosts:
  - "*"
  gateways:
  - sampleserver-gateway
  http:
  - match:
    - uri:
        exact: /
    route:
    - destination:
        host: nginx-service
        port:
          number: 8080

My deployment and service file:

apiVersion: v1
kind: Service
metadata:
  name: nginx-service
  labels:
    app: nginx
    service: nginx
spec:
  selector:
    app: nginx
  ports:
    - name: http 
      port: 8080
      targetPort: 3000 #80

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: nginx-details
  labels:
    account: nginx
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
    version: v1
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
      version: v1
  template:
    metadata:
      labels:
        app: nginx
        version: v1
    spec:
      serviceAccountName: nginx-details
      containers:
        - name: nginx
          image: uday1kiran/getting-started:1.0 #nginx
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 3000 #80
              name: nginx-port
          #securityContext:
              #runAsUser: 1000

For gateway, I set the default kubernetes service as ClusterIP. But, as it is not showing, for testing purpose I changed it to LoadBalancer to check any issue with app, but throug normal LoadBalancer service it is loading but not with istio ingresss gateway.

The sample app is public image, you can test directly

The source code of application is in app folder of repo