download.go

// Test case for http://code.google.com/p/go/issues/detail?id=4191
package main

import (
        "bytes"
	"io"
	"log"
	"net/http"
	"time"
)

func main() {
	url := "https://dl.google.com/chrome/mac/stable/GGRO/googlechrome.dmg" // anything relatively big
	resp, err := http.Get(url)
	if err != nil {
		log.Fatal(err)
	}

	done := make(chan bool)
	go func() {
		dst := &bytes.Buffer{}
		bytes, err := io.Copy(dst, resp.Body)
		log.Printf("Copied %d/%d bytes.", bytes, resp.ContentLength)
		if err != nil {
			log.Fatalf("Copy error: %s", err)
		}
		done <- true
	}()

	// abort download after one second
	time.Sleep(time.Second)
	log.Print("Closing...")
	err = resp.Body.Close()
	if err != nil {
		log.Fatalf("Close error: %s", err)
	}
	log.Print("Closed.")
	<-done
}