rpc error: code = Unknown desc = Moved Permanently: HTTP status code 301 - grpc

Question

I have GRPC service written in go and i need to deploy the service on top of AWS-EKS, we are using nginx-ingress and cloudflare to point to our cluster gateway (nginx).
but when i tried to deploy the service and test it using this command grpcurl grpc.fd-admin.com:443 list
i always get the following error:
Failed to list services: rpc error: code = Unknown desc = Moved Permanently: HTTP status code 301; transport: missing content-type field
And this is what i did for kubernetes resources:
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: grpc
labels:
k8s-app: grpc
spec:
replicas: 1
template:
metadata:
labels:
k8s-app: grpc
spec:
containers:
- name: grpc
image: quay.io/kubernetes-ingress-controller/grpc-fortune-teller:0.1
ports:
- containerPort: 50051
name: grpc
---
apiVersion: v1
kind: Service
metadata:
name: grpc
namespace: grpc
spec:
selector:
k8s-app: grpc
ports:
- port: 50051
targetPort: 50051
protocol: TCP
name: grpc
type: ClusterIP
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
annotations:
kubernetes.io/ingress.class: "nginx"
nginx.ingress.kubernetes.io/backend-protocol: "GRPC"
nginx.ingress.kubernetes.io/ssl-redirect: "true"
name: grpc
namespace: grpc
spec:
rules:
- host: grpc.fd-admin.com
http:
paths:
- backend:
serviceName: grpc
servicePort: grpc
tls:
- secretName: grpc
hosts:
- grpc.fd-admin.com
So can any one explain why i got this error or what is the reasons may cause this kind of error ?

Answer 1

Try below the annotations of nginx ingress,
kind: Ingress
metadata:
annotations:
kubernetes.io/ingress.class: "nginx"
nginx.ingress.kubernetes.io/backend-protocol: "GRPC"
nginx.ingress.kubernetes.io/grpc-backend-for-port: "grpc"
name: grpc