[Go] [Golang] How to download file

download-file.go

func downloadFile(fullUrl string) {
	// Extract filename from path
	fileURL, err := url.Parse(fullUrl)
	if err != nil {
		check(err)
	}
	path := fileURL.Path
	segments := strings.Split(path, "/")

	fileName := segments[len(segments)-1]
	fmt.Println("Start downloading:", fileName)

	// Create blank file
	file, err := os.Create(fileName)
	if err != nil {
		check(err)
	}
	// Create HTTP client
	client := http.Client{
		CheckRedirect: func(r *http.Request, via []*http.Request) error {
			r.URL.Opaque = r.URL.Path
			return nil
		},
	}

	// Put content on file
	resp, err := client.Get(fullUrl)
	if err != nil {
		check(err)
	}
	defer resp.Body.Close()

	size, err := io.Copy(file, resp.Body)

	defer file.Close()

	fmt.Printf("Downloaded a file %s with size %d\n", fileName, size)
	wg.Done()
}