webserver.go

package main

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

func dumpReq(r *http.Request) {
	fmt.Println("========================================================")
	fmt.Printf("Connection from %v\n", r.RemoteAddr)
	fmt.Println("--------------------------------------------------------")
	fmt.Printf("%s %s %s\n", r.Method, r.RequestURI, r.Proto)
	for name, val := range r.Header {
		fmt.Printf("%s:%s\n", name, val)
	}
	body, _ := ioutil.ReadAll(r.Body)
	fmt.Println()
	fmt.Println(string(body))
	fmt.Println()
}

func defaultHandler(w http.ResponseWriter, r *http.Request) {
	dumpReq(r)
}

func main() {
	if len(os.Args) != 2 {
		println("You must provide a listening port")
		return
	}
	port := os.Args[1]
	http.HandleFunc("/", defaultHandler)
	if err := http.ListenAndServe(":"+port, nil); err != nil {
		panic(err)
	}
}