Cannot use curl to access to Kong for Kubernetes

Hi, I am new to Kong. And I had set up Kong for Kubernetes following the steps from Install Kong for Kubernetes - v2.0.x.

I think everything is fine, I use

curl -i $PROXY_IP

It prints:

HTTP/1.1 404 Not Found
Date: Tue, 02 Jun 2020 13:43:29 GMT
Content-Type: application/json; charset=utf-8
Connection: keep-alive
Content-Length: 48
X-Kong-Response-Latency: 0
Server: kong/2.0.4

{"message":"no Route matched with those values"}

I create a pod in namespace kong and execute curl -i, it prints:

HTTP/1.1 404 Not Found
Date: Tue, 02 Jun 2020 13:57:06 GMT
Content-Type: application/json; charset=utf-8
Connection: keep-alive
Access-Control-Allow-Origin: *
Server: kong/2.0.4
Content-Length: 23
X-Kong-Admin-Latency: 0

{"message":"Not found"}

curl -i will return status data successfully as well. is the IP of the pod where Kong running.

So I expect I can use curl to configure Kong, I use curl -i -X GET
But it prints:
curl: (7) Failed to connect to port 8444: Connection refused

Here is the fractions of the yaml I use:

apiVersion: v1
kind: Service
    # I add annotations here to use the alicloud loadbalancer ********** "true"
  name: kong-proxy
  namespace: kong

apiVersion: apps/v1
kind: Deployment
    app: ingress-kong
  name: ingress-kong
  namespace: kong
      - env:
        - name: KONG_PROXY_LISTEN
          value:, ssl http2
        - name: KONG_ADMIN_LISTEN                          # Turn off ssl here
      - env:
      # value:
        value:                             # use http instead of https
        value: "true"
        value: kong/kong-proxy

How can I access to Kong? I am frustrated, have no idea what should I do now. I want to access to Kong and go with the Getting Stated Guide to learn Kong. Any help would be appreciated, Thinks.

Under normal conditions, you should not need to access Kong’s Admin API if you are using Ingress Controller.
If you do want to do it, I suggest you use kubectl port-forward to achieve it:

kubectl port-forward -n kong <pod-name> 8444:8444