Go で HTTP GET リクエスト中の帯域幅の使用を制限する方法は?

<code class="go">package main

import (
    "io"
    "net/http"
    "os"
    "time"
)

// Set data chunk size (in bytes) and time interval (in seconds)
var datachunk int64 = 500
var timelapse time.Duration = 1

func main() {
    // Initiate HTTP GET request
    response, _ := http.Get("http://google.com")

    // Read response in controlled intervals
    for range time.Tick(timelapse * time.Second) {
        // Read a chunk of data into stdout
        _, err := io.CopyN(os.Stdout, response.Body, datachunk)
        if err != nil {
            break
        }
    }
}</code>