Argocd Cli login – 307 HTTP Code

While setting up the argocd cli trying to access an argocd server whose endpoint is an ingress-nginx ssl-passthrough, I was getting the error:

FATA[0010] rpc error: code = Unknown desc = unexpected HTTP status code received from server: 307 (Temporary Redirect); malformed header: missing HTTP content-type

To solve the issue, I needed to add the following annotation to the ingress definition as defined on the official guide:

nginx.ingress.kubernetes.io/backend-protocol: "HTTPS"

The final ingress template looks like the following:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: my.argo.endpoint.com
  namespace: argocd
  annotations:
    nginx.ingress.kubernetes.io/force-ssl-redirect: "true"
    nginx.ingress.kubernetes.io/ssl-passthrough: "true"
    nginx.ingress.kubernetes.io/backend-protocol: "HTTPS"
spec:
  ingressClassName: nginx
  rules:
    - host: my.argo.endpoint.com
      http:
        paths:
        - path: /
          pathType: Prefix
          backend:
            service:
              name: argocd-server
              port:
                name: https