istio: Create two gateways will lead the second gateway does not work

I deployed two applications including bookinfo and httpbin.

1. Create gateway and virutalservice for httpbin first, and httpbin works fine.

[root@gyliu-icp-1 istio-0.8.0]# cat <<EOF | istioctl create -f -
> apiVersion: networking.istio.io/v1alpha3
> kind: Gateway
> metadata:
>   name: httpbin-gateway
> spec:
>   selector:
>     istio: ingressgateway # use Istio default gateway implementation
>   servers:
>   - port:
>       number: 80
>       name: http
>       protocol: HTTP
>     hosts:
>     - "*"
> EOF
Created config gateway/default/httpbin-gateway at revision 1709253

[root@gyliu-icp-1 istio-0.8.0]#
[root@gyliu-icp-1 istio-0.8.0]# cat <<EOF | istioctl create -f -
> apiVersion: networking.istio.io/v1alpha3
> kind: VirtualService
> metadata:
>   name: httpbin
> spec:
>   hosts:
>   - "*"
>   gateways:
>   - httpbin-gateway
>   http:
>   - match:
>     - uri:
>         prefix: /status
>     - uri:
>         prefix: /delay
>     route:
>     - destination:
>         port:
>           number: 8000
>         host: httpbin
> EOF
Created config virtual-service/default/httpbin at revision 1709254

[root@gyliu-icp-1 istio-0.8.0]# curl --resolve httpbin.example.com:$INGRESS_PORT:$INGRESS_HOST -I http://httpbin.example.com:$INGRESS_PORT/status/200
HTTP/1.1 200 OK
server: envoy
date: Wed, 06 Jun 2018 03:15:45 GMT
content-type: text/html; charset=utf-8
access-control-allow-origin: *
access-control-allow-credentials: true
content-length: 0
x-envoy-upstream-service-time: 8

1. Deploy gateway and virtualservice for bookinfo and bookinfo will not work.

[root@gyliu-icp-1 istio-0.8.0]# istioctl create -f samples/bookinfo/routing/bookinfo-gateway.yaml
Created config gateway/default/bookinfo-gateway at revision 1709319
Created config virtual-service/default/bookinfo at revision 1709320

The curl command return nothing and no log in istio-proxy of bookinfo.

[root@gyliu-icp-1 istio-0.8.0]# curl $INGRESS_HOST:$INGRESS_PORT/productpage

1. All of the gateway and virtualservices in my cluster.

[root@gyliu-icp-1 istio-0.8.0]# istioctl get virtualservices -oyaml
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  creationTimestamp: null
  name: bookinfo
  namespace: default
  resourceVersion: "1709320"
spec:
  gateways:
  - bookinfo-gateway
  hosts:
  - '*'
  http:
  - match:
    - uri:
        exact: /productpage
    - uri:
        exact: /login
    - uri:
        exact: /logout
    - uri:
        prefix: /api/v1/products
    route:
    - destination:
        host: productpage
        port:
          number: 9080
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  creationTimestamp: null
  name: httpbin
  namespace: default
  resourceVersion: "1709254"
spec:
  gateways:
  - httpbin-gateway
  hosts:
  - '*'
  http:
  - match:
    - uri:
        prefix: /status
    - uri:
        prefix: /delay
    route:
    - destination:
        host: httpbin
        port:
          number: 8000
---

[root@gyliu-icp-1 istio-0.8.0]# istioctl get gateway -oyaml
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  creationTimestamp: null
  name: bookinfo-gateway
  namespace: default
  resourceVersion: "1709319"
spec:
  selector:
    istio: ingressgateway
  servers:
  - hosts:
    - '*'
    port:
      name: http
      number: 80
      protocol: HTTP
---
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  creationTimestamp: null
  name: httpbin-gateway
  namespace: default
  resourceVersion: "1709253"
spec:
  selector:
    istio: ingressgateway
  servers:
  - hosts:
    - '*'
    port:
      name: http
      number: 80
      protocol: HTTP
---

But if I delete gateway of httpbin, then productpage works fine.

[root@gyliu-icp-1 istio-0.8.0]# istioctl delete virtualservices httpbin
Deleted config: virtualservices httpbin

[root@gyliu-icp-1 istio-0.8.0]# istioctl delete gateway httpbin-gateway
Deleted config: gateway httpbin-gateway

[root@gyliu-icp-1 istio-0.8.0]# curl $INGRESS_HOST:$INGRESS_PORT/productpage
<!DOCTYPE html>
<html>
  <head>
    <title>Simple Bookstore App</title>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">

<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">

<!-- Optional theme -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap-theme.min.css">

  </head>
  <body>



<nav class="navbar navbar-inverse navbar-static-top">
    <div class="container">
        <div class="navbar-header">
            <a class="navbar-brand" href="#">BookInfo Sample</a>
        </div>

        <button type="button" class="btn btn-default navbar-btn navbar-
....

@rshriram @vadimeisenbergibm @cmluciano comments for this?