Http match scheme dis not effect

Networking
1

with following config,http got 404

apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: bookinfo
spec:
  gateways:
  - bookinfo-gateway
  hosts:
  - '*'
  http:
  - match:
    - scheme:
        exact: "http"
    route:
    - destination:
        host: productpage
        port:
          number: 9080
apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: bookinfo
spec:
  gateways:
  - bookinfo-gateway
  hosts:
  - '*'
  http:
  - match:
    - scheme:
        prefix: "http"
    route:
    - destination:
        host: productpage
        port:
          number: 9080
apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: bookinfo
spec:
  gateways:
  - bookinfo-gateway
  hosts:
  - '*'
  http:
  - match:
    - scheme:
        regex: ".*"
    route:
    - destination:
        host: productpage
        port:
          number: 9080