package main import ( "net" "github.com/bsm/redeo" ) func main() { listener, _ := net.Listen("tcp", ":6379") server := redeo.NewServer(nil) server.HandleFunc("null_response", func(out *redeo.Responder, _ *redeo.Request) { out.WriteNil() }) server.Serve(listener) }In this example, we create a TCP listener on port 6379 and a new Redis server using the redeo package. We then add a new handler function that listens for the command "null_response". When this command is received, the handler function responds with a null response using the WriteNil method. Finally, the server is started and listens for incoming connections. Overall, the bsm.redeo Responder library provides a simple way to handle Redis protocol messages using Go. With the WriteNil command, you can easily generate null responses to send back to clients.