main.go

package main

import (
	"log"
	"net/http"
	_ "net/http/pprof"
)

func main() {
	http.Handle("/", &MyHandler{})
	http.Handle("/hello", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("world"))
	}))
	http.HandleFunc("/ping", hello)
	http.ListenAndServe(":8080", nil)
}

func hello(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte("pong"))
}

type MyHandler struct{}

func (m *MyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte("MyHandler ServeHTTP"))
}