Follow the official document got an error


#1

I follow the instruction from https://preliminary.istio.io/zh/docs/tasks/traffic-management/ingress/
got this error,need help
[root@node1 ~]# curl -I http://httpbin.example.com/status/200
HTTP/1.1 503 Service Unavailable
date: Tue, 05 Feb 2019 09:04:03 GMT
server: envoy
transfer-encoding: chunked
[root@node1 ~]# curl -I -HHost:httpbin.example.com http://$INGRESS_HOST:$INGRESS_PORT/status/200
HTTP/1.1 503 Service Unavailable
date: Tue, 05 Feb 2019 09:10:54 GMT
server: envoy
transfer-encoding: chunked