http

dataBytes, err := Download2Memory("https://www.google.com.tw/")
if err != nil {
	panic(err)
}
fmt.Println(len(dataBytes) > 0)

Output:

true

Output support string or os.File both OK!

// Output type: string
if err := DownloadFile("temp.html", "https://www.google.com.tw/"); err != nil {
	panic(err)
}

// Output type: writer
writer, err := os.Create("temp2.html")
if err != nil {
	panic(err)
}
if err = DownloadFile(writer, "https://www.google.com.tw/"); err != nil {
	panic(err)
}

// Output type: string
if err := DownloadFileWithTimeout("temp.html", "https://www.google.com.tw/", 5*time.Second); err != nil {
	panic(err)
}

// Output type: writer
writer, err := os.Create("temp2.html")
if err != nil {
	panic(err)
}
if err = DownloadFileWithTimeout(writer, "https://www.google.com.tw/", 5*time.Second); err != nil {
	panic(err)
}