I already set up Google Cloud Endpoints project and can invoke http/https requests. Endpoints gives me MY_API.endpoints.MY_PROJECT.cloud.goog domain name that I can use. I'm using gRPC Cloud Endpoints with HTTP/JSON to gRPC transcoding feature.

It is deployed on Google Kubernetes Engine (deployment yaml script attached at the end).

When I'm trying to create push subscription with that URL I getting next error:

"The supplied HTTP URL is not registered in the subscription's parent project (url="https://MY_API.endpoints.MY_PROJECT.cloud.goog/v1/path", project_id="PROJECT_ID").

My gcloud call:

gcloud pubsub subscriptions create SUB_NAME --topic=projects/MY_PROJECT/topics/MY_TOPIC --push-endpoint="https://MY_API.endpoints.MY_PROJECT.cloud.goog/v1/path"

I tried to create Cloud DNS public zone with that DNS name and set corresponding records. But I still can't verify ownership in Google Search Console.

The question is how can I set DNS TXT record for MY_API.endpoints.MY_PROJECT.cloud.goog domain to verify ownership? Or how to use Pubsub push subscription with Cloud Endpoints gRPC in other way?

I could verify ownership of domain if I have ability to change meta or headers of gRPC responses converted to HTTP. But I doubt if there is a way.

Kubernetes script I used for deployment (if it would be helpful).

apiVersion: v1
kind: Service
metadata:
  name: GKE_SERVICE_NAME
spec:
  ports:
  # Port that accepts gRPC and JSON/HTTP2 requests over HTTP.
  - port: 80
    targetPort: 9000
    protocol: TCP
    name: http2
  selector:
    app: GKE_SERVICE_NAME
  type: LoadBalancer
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: GKE_SERVICE_NAME
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: GKE_SERVICE_NAME
    spec:
      containers:
      - name: esp
        image: gcr.io/endpoints-release/endpoints-runtime:1
        args: [
          "--http2_port=9000",
          "--service=MY_API.endpoints.MY_PROJECT.cloud.goog",
          "--rollout_strategy=managed",
          "--backend=grpc://127.0.0.1:50051"
        ]
        ports:
          - containerPort: 9000
      - name: MY_CONTAINER_NAME
        image: gcr.io/MY_PROJECT/IMAGE_NAME:v1
        ports:
          - containerPort: 50051