keycloak: The plain HTTP request was sent to HTTPS port

Question

I have installed a keycloak software in the default namespace but when I access the URL on the browser getting the error "The plain HTTP request was sent to HTTPS port" can anyone suggest to me what I need to correct in my conf?

$ cat keycloak.yaml

apiVersion: v1
kind: Service
metadata:
  name: keycloak
  labels:
    app: keycloak
spec:
  ports:
  - name: http
    port: 8080
    targetPort: 8080
  selector:
    app: keycloak
  type: ClusterIP
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: keycloak
  labels:
    app: keycloak
spec:
  replicas: 1
  selector:
    matchLabels:
      app: keycloak
  template:
    metadata:
      labels:
        app: keycloak
    spec:
      containers:
      - name: keycloak
        image: quay.io/keycloak/keycloak:20.0.3
        args: ["start-dev"]
        env:
        - name: KEYCLOAK_ADMIN
          value: "admin"
        - name: KEYCLOAK_ADMIN_PASSWORD
          value: "admin"
        - name: KC_PROXY
          value: "edge"
        ports:
        - name: http
          containerPort: 8080
        readinessProbe:
          httpGet:
            path: /realms/master
            port: 8080

$ cat keycloak-subdomain-ingress.yaml
# keycloak-subdomain-ingress.yaml
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    nginx.ingress.kubernetes.io/backend-protocol: "HTTPS"
  labels:
    app: keycloak
  name: keycloak
spec:
  rules:
  - host: keycloak.host.internal.lab
    http:
      paths:
      - pathType: Prefix
        path: "/"
        backend:
          service:
            name: keycloak
            port:
              number: 8080
  tls:
  - hosts:
    - keycloak.hosts.internal.lab
    secretName: tls-credential