K8s: gets HTTP 415 for PATCH request to Kubernetes REST API server

Question

I have seen that PATCH request is supported in Kubernetes REST API reference manual from this link: https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.18/#patch-ingress-v1beta1-networking-k8s-io

HTTP Request
PATCH /apis/networking.k8s.io/v1beta1/namespaces/{namespace}/ingresses/{name}

However, I get HTTP 415 Unsupported Media Type error when sending PATCH request to Kubernetes cluster through Kubernetes REST API server in Postman.

I want to update our specified ingress partially outside the cluster. For this purpose, I added a snapshot from my trial.

Kubernetes REST API server Ingress PATCH Request

Our Kubernetes version is:

Client Version: version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.3", GitCommit:"2d3c76f9091b6bec110a5e63777c332469e0cba2", GitTreeState:"clean", BuildDate:"2019-08-19T11:13:54Z", GoVersion:"go1.12.9", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.3", GitCommit:"2d3c76f9091b6bec110a5e63777c332469e0cba2", GitTreeState:"clean", BuildDate:"2019-08-19T11:05:50Z", GoVersion:"go1.12.9", Compiler:"gc", Platform:"linux/amd64"}

Patching JSON:

{
   "apiVersion": "networking.k8s.io/v1beta1",
   "kind": "Ingress",
   "metadata": {
      "name": "demo-ingress",
      "annotations": {
         "nginx.org/rewrites": "serviceName=demo-service-235 rewrite=/"
      }
   },
   "spec": {
      "rules": [
         {
            "host": "www.demodeployment.com",
            "http": {
               "paths": [
                  {
                     "path": "/235/",
                     "backend": {
                        "serviceName": "demo-service-235",
                        "servicePort": 8088
                     }
                  }
               ]
            }
         }
      ]
   }
}

I can use GET, POST, PUT and DELETE successfully, in PATCH request I can't get the same results. What could be the root cause of the problem? What are your ideas?

Answer 1

I solved this same issue by setting the following header:

"Content-Type": "application/strategic-merge-patch+json"