与jsoup建立url连接后，返回：

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在建立连接之前，我已经在获取cookies：

Connection.Response res = Jsoup.connect(url)
            .method(Connection.Method.POST)
            .timeout(30000)
            .execute();
    Map<String, String> cookies = res.cookies();

然后我把它传递给jsoup连接。

Document document =  Jsoup.connect(url)
            .cookies(cookies)
            .ignoreHttpErrors(true)
            .timeout(30000)
            .get();

我做错什么了？