I have an Azure Kubernetes Cluster on which a couple of NodesJS Express Applications runs. I handle the incoming request by nginx-ingress

nginx-ingress

controller: https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/mandatory.yaml

service: https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/provider/cloud-generic.yaml

ingress:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: myingress
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /$2
    #nginx.ingress.kubernetes.io/use-regex: "true"
spec:
  rules:
  - http:
      paths:
      - path: /app1(/|$)(.*)
        backend:
          serviceName: app1-service
          servicePort: 80
      - path: /app2(/|$)(.*)
        backend:
          serviceName: app2-service
          servicePort: 80

example app1-service

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: app1
spec:
  replicas: 2
  template:
    metadata:
      labels:
        app: app1
    spec:
      nodeSelector:
        "beta.kubernetes.io/os": linux
      containers:
      - name: nodejs
        image: xxx.azurecr.io/app1:v1.0
        imagePullPolicy: Always
        ports:
        - containerPort: 80
          protocol: TCP
---
kind: Service
apiVersion: v1
metadata:
  name: app1-service
spec:
  selector:
    app: app1
  ports:
    - port: 80
      protocol: TCP
  type: NodePort

Like you can see all traffic on kubernetesurl.com/app1 gets forwarded to app1-service. And until there everything works.

example app1

Dockerfile: FROM node:8 WORKDIR /opt

COPY package.json /opt
RUN npm install

COPY . /opt

CMD ["npm", "start"]

server.js:

app.get('/', function(request, response) {
    response.sendFile(path.join(__dirname + '/login.html'));
});
app.post('/auth', function(request, response) {
    ... some auth stuff
    response.redirect('/home');
});
app.get('/home', function(request, response) {
    response.sendFile(path.join(__dirname + '/home.html'));
})

login.html:

<form action="auth" method="POST">
    <input type="text" name="username" placeholder="Username" required>
    <input type="password" name="password" placeholder="Password" required>
    <input type="submit">
</form>

Question

1. If I submit my form, I get redirected to kubernetesurl.com/auth.

   But I need kubernetesurl.com/app1/auth.

2. If I use a response.redirect('/home') inside '/', I get redirected to kubernetesurl.com/home.

   But I need kubernetesurl.com/app1/home.

3. If I add a link with relative url to index.html like home, I get redirected to kubernetesurl.com/home.

   But I need kubernetesurl.com/app1/home.

When I start express as a service on my VM, everything works (of course, because the app runs on '/' without proxying).

How I get it running with proxying?