HTTP middleware chain

package main

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

type Middleware func(http.Handler) http.Handler

func Chain(h http.Handler, middleware ...Middleware) http.Handler {
	for i := len(middleware) - 1; i >= 0; i-- {
		h = middleware[i](h)
	}
	return h
}

func RequestLogger(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		start := time.Now()
		next.ServeHTTP(w, r)
		log.Printf("%s %s %s", r.Method, r.URL.Path, time.Since(start))
	})
}

func main() {
	mux := http.NewServeMux()
	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		_, _ = w.Write([]byte("ok"))
	})
	handler := Chain(mux, RequestLogger)
	log.Fatal(http.ListenAndServe(":8080", handler))
}