Simple Gorilla Mux HTTP server with each request logged in Go lang

main.go

package main

import (
	"fmt"
	"log"
	"net/http"
	"net/http/httptest"
	"net/http/httputil"

	"github.com/gorilla/mux"
)

const port = ":8080"

func logHandler(fn http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		x, err := httputil.DumpRequest(r, true)
		if err != nil {
			http.Error(w, fmt.Sprint(err), http.StatusInternalServerError)
			return
		}
		log.Println(fmt.Sprintf("%q", x))
		rec := httptest.NewRecorder()
		fn(rec, r)
		if _, err = w.Write(rec.Body.Bytes()); err != nil {
			http.Error(w, fmt.Sprint(err),
				http.StatusInternalServerError)
			return
		}
		log.Println(fmt.Sprintf("%q", rec.Body))
	}
}

func messageHandler(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintln(w, "Hello, World!")
}

func main() {
	router := mux.NewRouter()
	router.HandleFunc("/", logHandler(messageHandler))
	log.Println("Starting server on", port)
	log.Fatal(http.ListenAndServe(port, router))
}

Replace

    router := mux.NewRouter()
    router.HandleFunc("/", logHandler(messageHandler))

with

    http.HandleFunc("/", logHandler(messageHandler))

and

	log.Fatal(http.ListenAndServe(port, nil))

can be used to start the server if using plain net/http package instead of gorilla/mux.