Unable to call gRPC endpoint for listing users

[sudo-suhas]

Describe the bug I am receiving an unexpected error when calling the ListUsers endpoint using gRPC.

ERROR:
  Code: Internal
  Message: unexpected HTTP status code received from server: 400 (Bad Request); malformed header: missing HTTP content-type

The logs on the server indicate a failure to route the request:

middleware: failed to match rule	{"path": "/v1beta1/users", "err": "undefined proxy rule"}

To Reproduce Call the Shield service with grpcurl:

grpcurl \
  -protoset <(buf build -o - /path/to/proton/odpf/shield/v1beta1/shield.proto) \
  -plaintext shield-server-url:80 \
  odpf.shield.v1beta1.ShieldService/ListUsers

Note: Skipping the -protoset parameter causes the command to hang. On the server, the logs indicate a failure to route the request:

middleware: failed to match rule	{"path": "/grpc.reflection.v1alpha.ServerReflection/ServerReflectionInfo", "err": "undefined proxy rule"}

Expected behavior

The server responds with the list of users.

Additional context

This also impacts the Shield extractor and sink (https://github.com/odpf/meteor/pull/408) in odpf/meteor.