package main import ( "fmt" "io" "log" "net/http" ) func Greet(writer io.Writer, name string) { fmt.Fprintf(writer, "Hello, %s\n", name) } // func main() { // Greet(os.Stdout, "Drew") // } // Here you can see that since now our greeter function takes an object that // implements the io.Writer interface we can now pass an object like the http.ResponseWriter // to it. func MyGreeterHandler(w http.ResponseWriter, r *http.Request) { Greet(w, "world") } func main() { log.Fatal(http.ListenAndServe(":5001", http.HandlerFunc(MyGreeterHandler))) }