How to Limit Bandwidth Usage During an HTTP GET Request in Go?

Controlling Bandwidth of HTTP Requests in Go

Question:

As a novice to Go, how can I restrict bandwidth consumption during an HTTP GET request?

Background:

Analysis:

You have discovered the mxk/go1/flowcontrol library, which provides low-level control over bandwidth usage. However, integrating it with the http.Get() method requires understanding how to access the underlying reader.

Solution:

While convenient wrappers exist in third-party packages, understanding the fundamentals of bandwidth control can be enlightening. Here's a simple implementation that illustrates the approach:

<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>

Explanation:

• __io.CopyN()__: Reads a specified number of bytes (datachunk) from the response body at controlled intervals (timelapse).
• __os.Stdout__: Represents the standard output, where the chunks are printed.

This code demonstrates how to manually limit bandwidth consumption while maintaining the core functionality of the http.Get() method.

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