HTTP2 Protocol Error / DSPE / Invalid Header

[swarren-sumglobal]

In a Kubenetes deployment with Istio or Linkerd, the grpc client created with @GrpcChannel("servicename") fails with a downstream protocol error (DSPE) / Invalid HTTP Header when calling the service.

If the grpc client is created with ManagedChannelBuilder.forTarget("servicename:port"), there are no errors.

While a Consul sidecar does not report the problem, both Istio and Linkerd sidecars (outbound) report the problem and kill the stream.

micronautVersion=2.0.2
micronautGrpcVersion = 2.0.5
kotlinVersion=1.3.72
kotlinxCoroutinesVersion=1.3.3
protocVersion=3.12.2
grpcVersion=1.29.0
grpcKotlinVersion=0.1.2

An example application (based on micronaut-grpc/examples/hello-world-kotlin), with additional detail and steps to produce, can be found here: https://github.com/SUMGlobal/dspe