package main

import (
	"fmt"
	"net/http"
)

func middleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		fmt.Println("前置操作")
		next.ServeHTTP(w, r)
		fmt.Println("後置操作")
	})
}

func root(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")
	w.Write([]byte(`{"name":"SuperWang","hobbies":["football","programming"]}`))
}

func main() {
	http.Handle("/jump", http.RedirectHandler("http://www.baidu.com", 302))
	http.Handle("/", middleware(http.HandlerFunc(root)))
	err := http.ListenAndServe(":8080", nil)
	if err != nil {
		fmt.Println(err)
	}
}