system/HTTP/DownloadResponse.php
public function setBinary(string $binary)
	{
		if ($this->file !== null)
		{
			throw DownloadException::forCannotSetBinary();
		}

		$this->binary = $binary;
	}
public function setBinary(string $binary)
	{
		if ($this->file !== null)
		{
			throw DownloadException::forCannotSetBinary();
		}

		$this->binary = $binary;
	}
set download for binary string.

@param string $binary