Go Web 示例: 中间件(基础)

中间件(基础)

个例子将展示如何在 Go 中创建基本的日志中间件。

中间件简单地将 http.HandlerFunc 作为其参数之一,包装它并返回一个新的 http.HandlerFunc 供服务器调用。

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// basic-middleware.go
package main

import (
    "fmt"
    "log"
    "net/http"
)

func logging(f http.HandlerFunc) http.HandlerFunc {
    return func(w http.ResponseWriter, r *http.Request) {
        log.Println(r.URL.Path)
        f(w, r)
    }
}

func foo(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintln(w, "foo")
}

func bar(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintln(w, "bar")
}

func main() {
    http.HandleFunc("/foo", logging(foo))
    http.HandleFunc("/bar", logging(bar))

    http.ListenAndServe(":8080", nil)
}
$ go run basic-middleware.go
2017/02/10 23:59:34 /foo
2017/02/10 23:59:35 /bar
2017/02/10 23:59:36 /foo?bar

$ curl -s http://localhost:8080/foo
$ curl -s http://localhost:8080/bar
$ curl -s http://localhost:8080/foo?bar

本文翻译自:https://gowebexamples.com/basic-middleware/

updatedupdated2021-07-032021-07-03
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