main.go

	for {
		buf := make([]byte, 1024*4)
		n, err := res.Body.Read(buf)
		if err == io.EOF {
			break
		}
		cbuf <- buf[:n]
		select {
		case <-cquit:
			err = fmt.Errorf("force quit")
			break
		default:
		}
	}