main.go

package main

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

func main() {
	http.Handle("/", loggingMiddleware(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
		fmt.Fprintln(w, "Hello World!")
	})))

	http.Handle("/healthz", loggingMiddleware(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
		fmt.Fprintln(w, "ok")
	})))

	log.Fatal(http.ListenAndServe(":8080", nil))
}

func loggingMiddleware(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 %s %s\" %d %d \"%s\" \"%s\"",
			r.RemoteAddr,
			start.Format("02/Jan/2006:15:04:05 -0700"),
			r.Method,
			r.RequestURI,
			r.Proto,
			http.StatusOK,
			r.ContentLength,
			r.Referer(),
			r.UserAgent(),
		)
	})
}