**注册 Request Handler** ~~~go func (w http.ResponseWriter, r *http.Request) ~~~ 这个函数接收两个参数： http.ResponseWriter：text/html响应 http.Request：包含关于这个HTTP请求的所有信息，包括像URL或header simple demo ~~~go http.HandleFunc("/", func (w http.ResponseWriter, r *http.Request) { fmt.Fprintf(w, "Hello, you've requested: %s\n", r.URL.Path) }) ~~~ 一个request handler 无法接受外部HTTP的请求，需要一个监听某个端口的http server来处理request，将其传给对应的request handler。 ~~~go http.ListenAndServe(":80", nil) ~~~ <details> <summary> Demo </summary> ``` package main import ( "fmt" "net/http" ) func main() { http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { fmt.Fprintf(w, "Hello, you've requested: %s\n", r.URL.Path) }) http.ListenAndServe(":80", nil) } ``` </details> ***** **http.FileServer** ``` fs := http.FileServer(http.Dir("static/")) http.Handle("/static/", http.StripPrefix("/static/", fs)) ```