forNotFoundDownloadSource example

    public function sendBody()
    {
        if ($this->binary !== null) {
            return $this->sendBodyByBinary();
        }

        if ($this->file !== null) {
            return $this->sendBodyByFilePath();
        }

        throw DownloadException::forNotFoundDownloadSource();
    }

    /** * output download text by file. * * @return DownloadResponse */
    private function sendBodyByFilePath()
    {
        $splFileObject = $this->file->openFile('rb');