NGINX 代理无法断开目标 Apache 服务器上的会话

我有一个在 Apache 服务器上运行的 PHP 脚本，它负责断开所有用户会话。为此，它创建一个循环，将自己标识为应该断开连接的会话并销毁它。这个程序没有回音。

Apache 日志返回 HTTP 代码 200，表示一切顺利。

但是 NGINX 返回以下错误。

[error] 512#512: *2699 upstream sent too big header while reading response header from upstream, client: <public-ip>, server: server01.example.com, request: "GET /tste.php HTTP/1.1", upstream: "http://192.168.50.2:80/tste.php", host: "server02.example.com"

什么会导致这个问题？

脚本：

<?php
error_reporting(-1);
ini_set('display_errors', 1);

if (!function_exists('deleteSession')) {
    function deleteSession($targetSessionID)
    {
        // 1. commit session if it's started.
        if (session_id()) {
            session_commit();
        }

        // 2. store current session id
        session_start();
        $current_session_id = session_id();
        session_commit();

        // 3. hijack then destroy session specified.
        
        session_id($targetSessionID);
        session_start();
        session_destroy();
        session_commit();


        // 4. restore current session id. If don't restore it, your current session will refer to the session you just destroyed!
        
        session_id($current_session_id);
        session_start();
        session_commit();

    }
}

$sessions = [
    'soadjasjosldjsaoidjasoijdsajdsaj',
    'soadjasjosldjsaoidjasoijdsajdsaj',
    'soadjasjosldjsaoidjasoijdsajdsaj',
    'soadjasjosldjsaoidjasoijdsajdsaj',
    'soadjasjosldjsaoidjasoijdsajdsaj',
    'soadjasjosldjsaoidjasoijdsajdsaj',
    'soadjasjosldjsaoidjasoijdsajdsaj',
    'soadjasjosldjsaoidjasoijdsajdsaj',
    'soadjasjosldjsaoidjasoijdsajdsaj',
    'soadjasjosldjsaoidjasoijdsajdsaj',
    'soadjasjosldjsaoidjasoijdsajdsaj',
    'soadjasjosldjsaoidjasoijdsajdsaj',
    'soadjasjosldjsaoidjasoijdsajdsaj'
];

foreach ($sessions as $session) {
    deleteSession($session);
}