Google 服务器在隐私浏览模式下的第一个请求出现服务器错误

每当我运行该网址时https://scholar.google.com/citations?user=N7m4vIQAAAAJ&hl=en在 Safari 和 Google Chrome 的私有窗口中，Google 会给出错误。

它仅在隐私浏览模式的第一个请求时发生。

有人知道为什么这种情况只在特定环境下发生吗？ 这种情况从三天前就开始发生了。

-- 错误消息和捕获

Server Error We're sorry but it appears that there has been an internal server error while processing your request. Our engineers have been notified and are working to resolve the issue. Please try again later.

- - 添加

头文件包括

http header response Cache-Control: no-cache, must-revalidate Content-Encoding: gzip Content-Type: text/html; charset=UTF-8 Date: Mon, 16 Nov 2015 19:35:39 GMT Expires: Fri, 01 Jan 1990 00:00:00 GMT Pragma: no-cache Server: citations Set-Cookie: NID=73=eF98qod1NpYg7nb03RUToiSiacFgqNoZxQ4CuzqwGlQn53SoR7rHlzO0OExsmYkpRazROCQ3WqKoCsWKFPxp8dZr5pBra6nD1HPcxWUILl9gVAf5Q7GSQc3B0O3TP4gu; expires=Tue, 17-May-2016 19:35:39 GMT; path=/; domain=.google.com; HttpOnly X-Firefox-Spdy: h2 X-Frame-Options: SAMEORIGIN X-XSS-Protection: 1; mode=block p3p: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info." x-content-type-options: no sniff

通过在请求 URL 时使用 cookie 解决了该问题。参考：PHP cURL 如何添加用户代理值或克服服务器阻止 cURL 请求？ https://stackoverflow.com/questions/17801094/php-curl-how-to-add-the-user-agent-value-or-overcome-the-servers-blocking-curl-r

我使用 php 脚本来检索并放置一些 cookie 选项。

代码片段是

    $curl = curl_init($url);
    $dir                   = dirname(__FILE__);
    $config['cookie_file'] = $dir . '/cookies/' . md5($_SERVER['REMOTE_ADDR']) . '.txt';

    curl_setopt($curl, CURLOPT_COOKIEFILE, $config['cookie_file']);
    curl_setopt($curl, CURLOPT_COOKIEJAR, $config['cookie_file']);

    curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);

    $data = curl_exec($curl);
    curl_close($curl);