Cannot call my GRPC server with kong-gateway

Questions
1

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why i cannot call grpc through localhost:9080 /pb.UserService/CreateUser
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i already reflect my server grpc
func main() {
config, err := util.LoadConfig(“.”)
if err != nil {
log.Logger.Fatal(“Error when loading env!!”, err)
}
runGrpcServer(config)
}
func runGrpcServer(config util.Config) {
server, err := gapi.NewServer(config)
if err != nil {
log.Logger.Fatal(“Error when creating server”)
}

grpcServer := grpc.NewServer()
pb.RegisterUserServiceServer(grpcServer, server)
reflection.Register(grpcServer) // Reflect grpc server

listener, err := net.Listen("tcp", config.APIEndpoint)
if err != nil {
	log.Logger.Fatal("Error when creating listener")
}
log.Logger.Printf("start gRPC server at %s", listener.Addr().String())

err = grpcServer.Serve(listener)
if err != nil {
	log.Logger.Fatal("Cannot creating grpc server")
}

}