golang http中间件

中间件是把http.Handler包装后做请求的一些预处理或后处理。

#例子:
package main
import (
    "fmt"
    "log"
    "net/http"
)


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

// 封装中间件
func middleware(next http.Handler) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        log.Println(r.URL.Path)
        next.ServeHTTP(w, r)
    })
}

func main() {
    http.Handle("/test", middleware(http.HandlerFunc(test)))
    http.ListenAndServe(":8080", nil)
}