I try to configure Google Cloud CDN to my container engine project.

Following the documentation It has either a Content-Length header or a Transfer-Encoding header in order to be cached.

My backend use gzip compression so I have Transfer-Encoding: chunked

The problem is it seems the ingress load balancer remove the Transfer-encoding header so I can't have a "cache hit"

I used "kubectl port-forward" to connect direclty to an instance backend and I have the Transfer-encoding header.

But when I connect to the external IP, the header has disappear.

Here my ingress configuration

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: gateway-preprod3-ingress
  annotations:
    kubernetes.io/ingress.global-static-ip-name: gateway-preprod2-static-ip
spec:
  tls:
  - secretName: gateway-preprod-secret-2018-with-ca-7
  backend:
    serviceName: gateway-preprod
    servicePort: 80

Here my deployment configuration

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: gateway-preprod
spec:
  replicas: 1
  strategy:
    type: RollingUpdate
  minReadySeconds: 50
  template:
    metadata:
      labels:
        app: gateway-preprod
    spec:
      containers:
      - name: gateway-preprod
        image: eu.gcr.io/writecontrol-1055/gateway:v305
        env:
        - name: writecontrolEnv
          value: preprod
        ports:
        - containerPort: 80

In the opposite, for certain ressources not GZIP compressed, the Content-length header is given and I have a successful "cache hit"

The kubernetes version is 1.7.12-gke.1

Here an URL to test it : https://preprod-writecontrol.ovh