How to Limit Bandwidth of HTTP GET Requests in Go?

Limiting Bandwidth of HTTP GET Requests in Go

As a novice to Go, one might encounter the need to restrict the bandwidth consumption of http.Get() requests. While third-party packages offer convenient wrappers, this article dives deep into the underlying mechanisms of bandwidth limiting.

Accessing the HTTP Reader

To control the bandwidth, accessing the underlying HTTP reader is crucial. In Go, this reader is embedded within the http.Response object.

Bandwidth Limiting

The io.CopyN function in Go allows for controlled copying of data. By specifying the number of bytes (datachunk) and the time interval (timelapse), developers can effectively throttle the bandwidth usage.

Example Implementation

The following code snippet demonstrates how to limit bandwidth in Go:

<code class="go">package main

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

var datachunk int64 = 500       //Bytes
var timelapse time.Duration = 1 //per seconds

func main() {
    responce, _ := http.Get("http://google.com")
    for range time.Tick(timelapse * time.Second) {
        _, err := io.CopyN(os.Stdout, responce.Body, datachunk)
        if err != nil {
            break
        }
    }
}</code>

In this example, the bandwidth is limited to datachunk bytes every timelapse seconds, effectively restricting the transfer rate. This process iterates until the HTTP response is fully received.

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