Playing around with github.com/cheggaaa/pb

progress.go

package main

import (
	"flag"
	"io/ioutil"
	"log"
	"net/http"
	"strconv"

	"github.com/cheggaaa/pb"
)

var url = flag.String("url", "", "URL to get")

func main() {
	flag.Parse()
	resp, err := http.Get(*url)
	if err != nil {
		log.Fatal(err)
	}
	defer resp.Body.Close()
	l, err := strconv.Atoi(resp.Header.Get("Content-Length"))
	if err != nil {
		log.Fatal("no content-length")
	}
	b := pb.New(l).SetUnits(pb.U_BYTES)
	b.ShowSpeed = true
	b.Start()
	ioutil.ReadAll(b.NewProxyReader(resp.Body))
	b.Finish()
}