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    $filename = $request->get('filename');
    $url = "https://file.yuchuantech.com/" . $filename;
    //打开文件
    if (empty($url) || false === @fopen($url, 'rb')) {
        exit('文件不存在');
    }
    // 处理中文名
    $filename = basename($url);
    $user_agent = $_SERVER["HTTP_USER_AGENT"];
    if (false !== stripos($user_agent, 'Trident')) {
        $filename = rawurlencode($filename);
    }
    // 文件在其他节点服务器
    $header = get_headers($url, 1);
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename="' . $filename . '"');
    header('Content-Length: ' . $header['Content-Length']);
    readfile($url);
    exit;