Istio virtual service subset not able to send request to specific pods - go

Question

I have following scenario
FastAPI (API Gateway)
Users (gRPC service)
below is the deployment yaml
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: users
labels:
app: users
version: v1
spec:
replicas: 1
selector:
matchLabels:
app: users
version: v1
template:
metadata:
labels:
app: users
version: v1
spec:
containers:
- image: users:v0.0.1
imagePullPolicy: Always
name: svc
ports:
- containerPort: 9090
---
kind: Service
apiVersion: v1
metadata:
name: users
labels:
app: users
spec:
selector:
app: users
ports:
- name: grpc
protocol: TCP
port: 9090
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: fastapi
labels:
app: fastapi
version: v1
spec:
replicas: 1
selector:
matchLabels:
app: fastapi
version: v1
template:
metadata:
labels:
app: fastapi
version: v1
spec:
containers:
- image: fastapi:latest
imagePullPolicy: Always
name: web
ports:
- containerPort: 8080
env:
- name: USERS_SVC
value: 'users:9090'
---
kind: Service
apiVersion: v1
metadata:
name: fastapi
labels:
app: fastapi
spec:
selector:
app: fastapi
ports:
- port: 8080
name: http
After this I tried to test virtual service and route to users service (version: v2) when https header is passed. below is the codes for virtual service and destination rules
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
name: users-service-destination-rule
spec:
host: users
subsets:
- name: v1
labels:
version: v1
- name: v2
labels:
version: v2
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: users-virtual-service
spec:
hosts:
- users
http:
- match:
- headers:
x-user-testing:
exact: tester
route:
- destination:
host: users
subset: v2
- route:
- destination:
host: users
subset: v1
Below is the deployment for user service (version v2)
apiVersion: apps/v1
kind: Deployment
metadata:
name: users-v2
labels:
app: users
version: v2
spec:
replicas: 1
selector:
matchLabels:
app: users
version: v2
template:
metadata:
labels:
app: users
version: v2
spec:
containers:
- image: users:v0.0.1
imagePullPolicy: Always
name: svc
ports:
- containerPort: 9090
When i passed header value, the request always goes to version v1.
curl -H "x-user-testing: tester" localhost/users
Can anyone help me please.
Thanks in advance