package main

import (
	"bufio"
	"bytes"
	"fmt"
	"net/http"
	"net/http/httptest"
	"net/http/httputil"
)

func main() {
	const body = "abc"
	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Date", "Wed, 19 Jul 1972 19:00:00 GMT")
		w.Header().Set("Content-Length", "9999")
		fmt.Fprintln(w, body)
	}))
	defer ts.Close()

	resp, err := http.Head(ts.URL)
	if err != nil {
		fmt.Println(err)
	}
	defer resp.Body.Close()

	dump, err := httputil.DumpResponse(resp, true)
	if err != nil {
		fmt.Println(err)
	}

	rd := bytes.NewReader(dump)
	buf := bufio.NewReader(rd)
	resp, err = http.ReadResponse(buf, nil)
	if err != nil {
		fmt.Println(err)
	}
	fmt.Println(resp.Body)
	err = resp.Body.Close()
	fmt.Println(err)

       //&{0xc0000b4018 <nil> <nil> false false {0 0} false false false <nil>}
       //unexpected EOF
}