Azure Kubernetes Nginx Ingress: How do I properly route to an API service and an Nginx web server with HTTPS and avoid 502? - kubernetes

Question

I have 2 services, one serves up a rest API and the other serves up static content via nginx web server.
I can retrieve the static content from the pod running an nginx web server via the ingress controller using https provided that I don't use the following annotation within the ingress yaml
nginx.ingress.kubernetes.io/backend-protocol: HTTPS
However, the backend API service no longer works. If I add that annotation back, the backend service URL https://fqdn/restservices/engine-rest/v1/api works but the front end https://fqdn/ web server throws a 502.
Ingress
Ingress
kind: Ingress
apiVersion: extensions/v1beta1
metadata:
name: ingress
namespace: namespace-abc
annotations:
nginx.ingress.kubernetes.io/backend-protocol: HTTPS
spec:
rules:
- http:
paths:
- path: /restservices/engine-rest/v1
backend:
serviceName: a
servicePort: 8080
- path: /
backend:
serviceName: b
servicePort: 8011
Service API
kind: Service
apiVersion: v1
metadata:
name: a
namespace: namespace-abc
labels:
app: a
version: 1
spec:
ports:
- name: https
protocol: TCP
port: 80
targetPort: 8080
nodePort: 31019
selector:
app: a
version: 1
clusterIP: <cluster ip>
type: LoadBalancer
sessionAffinity: ClientIP
externalTrafficPolicy: Cluster
sessionAffinityConfig:
clientIP:
timeoutSeconds: 10800
Service UI
kind: Service
apiVersion: v1
metadata:
name: b
namespace: namespace-abc
labels:
app: b
version: 1
annotations:
spec:
ports:
- name: http
protocol: TCP
port: 8011
targetPort: 8011
nodePort: 32620
selector:
app: b
version: 1
clusterIP: <cluster ip>
type: LoadBalancer
sessionAffinity: None
externalTrafficPolicy: Cluster

Answer 1

If your problem is that adding nginx.ingress.kubernetes.io/backend-protocol: HTTPS makes service-A work but fails service-B, and removing it makes service-A fail but works for service-B, then the solution is to create two different Ingress objects so they can be annotated independently
---
kind: Ingress
apiVersion: extensions/v1beta1
metadata:
name: ingress-a
namespace: namespace-abc
annotations:
nginx.ingress.kubernetes.io/backend-protocol: HTTPS
spec:
rules:
- http:
paths:
- path: /restservices/engine-rest/v1
backend:
serviceName: a
servicePort: 8080
---
kind: Ingress
apiVersion: extensions/v1beta1
metadata:
name: ingress-b
namespace: namespace-abc
spec:
rules:
- http:
paths:
- path: /
backend:
serviceName: b
servicePort: 8011