system/HTTP/DownloadResponse.php
public function sendBody()
	{
		if ($this->binary !== null)
		{
			return $this->sendBodyByBinary();
		}
		elseif ($this->file !== null)
		{
			return $this->sendBodyByFilePath();
		}

		throw DownloadException::forNotFoundDownloadSource();
	}
public function sendBody()
	{
		if ($this->binary !== null)
		{
			return $this->sendBodyByBinary();
		}
		elseif ($this->file !== null)
		{
			return $this->sendBodyByFilePath();
		}

		throw DownloadException::forNotFoundDownloadSource();
	}
output download file text.

@throws DownloadException

@return DownloadResponse