Support for authentication ? (e.g. Client certificates)

[arianvp]

Like documented on https://grpc.io/docs/guides/auth/

[serras]

Looking at the documentation for http2-client-grpc, which is the underliying gRPC implementation we are using, you can pass TLS client parameters. Note that Haddock has screwed up and points to a different ClientParams type, the right one comes from Network.TLS.

Is this enough? We do not support per-call credentials, though.