Main function for grpc-gateway REST and gRPC muxed on a simgle port

main.go (partial)

func main() {
	keyPair, certPool := certificates.GetCert()

	grpcServer := makeGRPCServer(certPool)
	restMux, err := getRestMux(certPool)
	if err != nil {
		log.Panic(err)
	}

	// register root Http multiplexer (mux)
	mux := http.NewServeMux()

	// we can add any additional non-grpc endpoints here.
	mux.HandleFunc("/foobar/", simpleHTTPHello)

	// register the gateway mux onto the root path.
	mux.Handle("/", restMux)

	// the grpcHandlerFunc takes an grpc server and a http muxer and will
	// route the request to the right place at runtime.
	mergeHandler := grpcHandlerFunc(grpcServer, mux)

	// configure TLS for our server. TLS is REQUIRED to make this setup work.
	// check https://golang.org/src/net/http/server.go?#L2746
	srv := &http.Server{
		Addr:    serveAddress,
		Handler: mergeHandler,
		TLSConfig: &tls.Config{
			Certificates: []tls.Certificate{*keyPair},
			NextProtos:   []string{"h2"},
		},
	}

	// start listening on the socket
	conn, err := net.Listen("tcp", serveAddress)
	if err != nil {
		panic(err)
	}

	// start the server
	fmt.Printf("starting GRPC and REST on: %v\n", serveAddress)
	err = srv.Serve(tls.NewListener(conn, srv.TLSConfig))
	if err != nil {
		log.Fatalf("failed to serve: %v", err)
	}
}