Question

我一直在研究golang，我注意到很多人使用http.NewServeMux()函数创建服务器，我真的不明白它是做什么的。

我读到了这个：

在go ServeMux是一个HTTP请求多路复用器。它匹配的URL 针对已注册模式和调用列表的每个传入请求与该URL最匹配的模式的处理程序。

这与做以下事情有什么不同：

http.ListenAndServe(addr, nil)
http.Handle("/home", home)
http.Handle("/login", login)

使用多路复用的目的是什么？

Answer 1

来自net/http GoDoc和来源。

ListenAndServe starts an HTTP server with a given address and handler. The handler is usually nil, which means to use DefaultServeMux. Handle and HandleFunc add handlers to DefaultServeMux

DefaultServeMux只是预定义的http.ServeMux

var DefaultServeMux = &defaultServeMux
var defaultServeMux ServeMux

您可以在内部看到http.Handle来电DefaultServeMux。

func Handle(pattern string, handler Handler) { DefaultServeMux.Handle(pattern, handler) }

http.NewServeMux()的目的是为您的实例设置http.Servermux实例，例如当您需要两个http.ListenAndServe函数来侦听具有不同路由的不同端口时。

Answer 2

Golang中的多路复用器类似于硬件中的多路复用器，它将某些输入乘以某些输出

我给了你一个简单的例子

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给定的多路复用器必须实现type CustomMultiplexer struct { }方法才能将http int注册到服务器输入

ServeHTTP

我的func (mux CustomMultiplexer) ServeHTTP(w http.ResponseWriter, r *http.Request) { if r.URL.Path == "/" { SimpleRequestHandler(w, r) return } http.NotFound(w, r) return }是如下方法

SimpleRequestHandler

知道我可以使用我的func SimpleRequestHandler(w http.ResponseWriter, r *http.Request) { switch r.Method { case http.MethodGet: mySimpleGetRequestHandler(w, r) break default: http.Error(w, "method not allowed", http.StatusMethodNotAllowed) break } }在请求的传入之间进行多路复用

CustomMultiplxere

func main() { customServer := CustomServer{} err := http.ListenAndServe(":9001", &customServer) if err != nil { panic(err) } }方法用作我给定的简单多路复用器。

什么是http请求多路复用器？

2 个答案: