ingress in AKS for API - asp.net-core

Question

I'm trying to deploy an ASP-Net Core API and make it available from outside cluster trough an ingress. I have followed the steps mentioned in the learn page. All the steps are working fine, however, I'm unable to access my ingress on the route /api/opportunities/. Below I'm describing my K8S files, might I be missing something?
apiVersion: apps/v1
kind: Deployment
metadata:
name: opportunities-api
spec:
replicas: 1
selector:
matchLabels:
component: opportunities-api
template:
metadata:
labels:
component: opportunities-api
spec:
containers:
- name: opportunities-api
image: mycontainer.azurecr.io/opportunities-api:{BUILD_NO}
imagePullPolicy: Always
ports:
- containerPort: 80
apiVersion: v1
kind: Service
metadata:
name: opportunities-api
spec:
ports:
- port : 80
protocol: TCP
targetPort: 80
selector:
component: opportunities-api
type: ClusterIP
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: opportunities-api
annotations:
nginx.ingress.kubernetes.io/ssl-redirect: "false"
nginx.ingress.kubernetes.io/use-regex: "true"
nginx.ingress.kubernetes.io/rewrite-target: /$2
spec:
ingressClassName: nginx
rules:
- http:
paths:
- path: /api(/|$)(.*)
pathType: Prefix
backend:
service:
name: opportunities-api
port:
number: 80

Answer 1

I see that host field is missing in above ingress yaml. Did you try adding .spec.rules.host in the ingress yaml as below and see if it helps?
As per the nginx document, it is one of the restrictions.
Also, if AKS v>=1.24, then can you check what is the value set for annotation service.beta.kubernetes.io/azure-load-balancer-health-probe-request-path in ingress controller service. It should be /healthz as discussed in AKS Ingress-Nginx ingress controller failing to route by host
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: opportunities-api
annotations:
nginx.ingress.kubernetes.io/ssl-redirect: "false"
nginx.ingress.kubernetes.io/use-regex: "true"
nginx.ingress.kubernetes.io/rewrite-target: /$2
spec:
ingressClassName: nginx
rules:
- host: abc.com #your host name here
http:
paths:
- path: /api(/|$)(.*)
pathType: Prefix
backend:
service:
name: opportunities-api
port:
number: 80