Support for gRPC protocol

[rustycl0ck]

Currently there is documentation (and support?) only for HTTPS protocol. Creating a service which exposes only gRPC ports, does not work with Gateway.

$ grpcurl my-service.example.com:443 list
Failed to list services: rpc error: code = Unavailable desc = upstream connect error or disconnect/reset before headers. reset reason: protocol error

Is there any guide for using Gateway with gRPC services? Or is this even supported currently?

[rustycl0ck]

Seems like this is already in their issue tracker:

• HTTP2 friendly ingress gateway setup when using L7 load balancers
• Add support for GrpcRoute in gateway.networking.k8s.io/v1

But no updates on either yet.

[gojanpaolo]

Related/duplicate issue: https://issuetracker.google.com/issues/318546837