HTTP Listener

listener.go

package main

import (
	"io/ioutil"
	"log"
	"net/http"
	"os"
	"strings"
)

func requestToString(r *http.Request) string {
	s := r.Proto + " " + r.Method + " " + r.URL.String() + "\n"
	for k, v := range r.Header {
		s += k + ": " + strings.Join(v, ", ") + "\n"
	}

	body, err := ioutil.ReadAll(r.Body)
	if err == nil {
		s += "\n" + string(body) + "\n"
	}

	return s
}

func main() {
	port := ":8080"
	if len(os.Args) > 1 {
		port = ":" + os.Args[1]
	}

	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		log.Println(requestToString(r))
	})

	log.Println("Listening on port", port)
	log.Fatal(http.ListenAndServe(port, nil))
}