go http两种使用方法

1，常规教程使用，实际中基本不会这么用

    http.HandleFunc("/", func(writer http.ResponseWriter, request *http.Request) {
        _, err := writer.Write([]byte("hello world"))
        if err != nil {
            panic(err)
        }
    })
    
    err := http.ListenAndServe(":9090", nil)
    if err != nil {
        panic(err)
    }
    fmt.Println("监听了9090端口")

2，实际使用

type MyMux struct {}

func (m *MyMux) ServeHTTP(w http.ResponseWriter, r *http.Request){
    if r.URL.Path == "/" {
        _, err := fmt.Fprintln(w, "hello world it me")
        if err != nil {
            panic(err)
        }
    } else {
        http.NotFound(w,r)
    }
    return
}

func Server2(){
    mux := &MyMux{}

    err := http.ListenAndServe(":9091", mux)
    if err != nil {
        panic(err)
    }
}