io.TeeReader usage

tee_page.go

package main

import (
	"net/http"
	"log"
	"io"
	"bufio"
	"os"
)


func SaveAndPrint(r io.Reader, fileName string) {
	file, err := os.Create(fileName)
	defer file.Close()

	if err != nil {
		log.Fatal("ERROR", err)
		return
	}
	w := bufio.NewWriter(file)

	io.Copy(os.Stdout, io.TeeReader(r, w))
}

func main() {
	resp, err := http.Get("http://www.golang.org")

	if err != nil {
		log.Fatal("ERROR", err)
	}

	defer resp.Body.Close()

	SaveAndPrint(resp.Body, "index.html")
}