color-istio-gw-client-cookie.yaml

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

apiVersion: v1
kind: Service
metadata:
  name: color-service
  labels:
    app: color
spec:
  ports:
  - name: http
    port: 8000
    targetPort: 8080 #Port in containers
  selector:
    app: color    

---
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: color-is-dr
spec:
  host: color-service
  subsets:
  - name: blue-sub
    labels:
      color: blue
  - name: green-sub
    labels:
      color: green

---   
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: color-is-vs-cookie
spec:
  hosts:
  - "*"
  gateways:
  - color-is-gw
  http:
  - match:
    - uri:
        prefix: /cookie
      headers:
        cookie:
          regex: ^(.\*?;)?(my-color=green)(;.\*)?$
    route:
    - destination:
        host: color-service #Name of the service
        subset: green-sub
  - match:
    - uri:
        prefix: /cookie
    route:
    - destination: #Default (if match is false)
        host: color-service #Name of the service
        subset: blue-sub