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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