Method SendFileWithRate

context/context.go:5519–5526

SendFileWithRate same as `SendFile` but it can throttle the speed of reading and though writing the file to the client.

(src, destName string, limit float64, burst int)

// SendFileWithRate same as `SendFile` but it can throttle the speed of reading
// and though writing the file to the client.
func (ctx *Context) SendFileWithRate(src, destName string, limit float64, burst int) error {
	if destName == "" {
		destName = filepath.Base(src)
	}

	ctx.writer.Header().Set(ContentDispositionHeaderKey, MakeDisposition(destName))
	return ctx.ServeFileWithRate(src, limit, burst)
}

// MakeDisposition generates an HTTP Content-Disposition field-value.
// Similar solution followed by: Spring(Java), Symfony(PHP) and Ruby on Rails frameworks too.