How to Limit HTTP Get Bandwidth in Go: A Custom Approach?

How to Limit HTTP Get Bandwidth in Go

As a novice in Go, you may encounter scenarios where you need to control the bandwidth consumed by your http.Get() requests. One popular solution is to utilize a third-party package like mxk/go1/flowcontrol. However, for a deeper understanding of the underlying mechanisms, this article provides a simple custom approach.

To limit bandwidth, we need to restrict the rate at which data is read from the HTTP response body. In the provided code snippet:

<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>

We define two variables:

• datachunk determines the size of the data chunks read from the response body in bytes.
• timelapse specifies the interval at which we read data chunks.

The main function performs the following steps:

1. Sends an HTTP GET request and stores the response in the response variable.
2. Enters an infinite loop that waits for the specified timelapse.
3. Within the loop, it reads a chunk of data from the response body using io.CopyN(). The size of the chunk is defined by datachunk, and the timelapse ensures that only one chunk is read at a specified interval.

This simple approach provides a flexible way to limit the bandwidth of your HTTP GET requests. You can adjust datachunk and timelapse as needed to achieve the desired bandwidth restriction.

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