php把远程服务器图片(阿里云服务器)直接通过浏览器下载

//入参为远程图片地址，如：https:://www.baidu.com/test123.jpg
//代码如下：
public function getImage(Request $request)
    {
        $url = request(\'url\');
        if(empty($url)){
            return Tool::outErrcode(1,\'图片地址有误\');
        }
        $file  =  fopen($url, "rb");
        $file_name = parse_url($url)[\'path\'];
        Header( "Content-type:  application/octet-stream ");
        Header( "Accept-Ranges:  bytes ");
        Header( "Content-Disposition:  attachment;  filename= $file_name");
        while (!feof($file)) {
            echo fread($file, 8192);
            ob_flush();
            flush();
        }
        fclose($file);
    }