get status code from a gRPC endpoint not using a gRPC client - amazon-web-services

Question

How could I get the status code from a gRPC endpoint without having a gRPC client?
I need to test some gRPC endpoints that are behind an AWS application load balancer (target group) with a health check configured to only accept status 12
UNIMPLEMENTED 12 The operation is not implemented or is not supported/enabled in this service.
I tried grpcurl for example:
grpcurl -plaintext 10.1.2.8:8443 AWS.ALB/healthcheck:
But in many cases I get:
Error invoking method "AWS.ALB/healthcheck": failed to query for service descriptor "AWS.ALB": server does not support the reflection API
Any alternatives or ideas? I am just interested in the status code 12 or description UNIMPLEMENTED

Answer 1

For status code 12, you can change it through
alb.ingress.kubernetes.io/success-codes: '0' // change success code to 0
spec:
rules:
- host: server.xxx.com
http:
paths:
- path: /* // set to * to match all grpc service paths
backend:
serviceName: server
servicePort: 9420
Also enable server reflection
## -40,6 +40,7 ## import (
"google.golang.org/grpc"
pb "google.golang.org/grpc/examples/helloworld/helloworld"
+ "google.golang.org/grpc/reflection"
)
const (
## -61,6 +62,8 ## func main() {
}
s := grpc.NewServer()
pb.RegisterGreeterService(s, &pb.GreeterService{SayHello: sayHello})
+ // Register reflection service on gRPC server.
+ reflection.Register(s)
if err := s.Serve(lis); err != nil {
log.Fatalf("failed to serve: %v", err)
}