ajax.php

См. документацию.

<?php
define('NO_KEEP_STATISTIC', 'Y');
define('NO_AGENT_STATISTIC','Y');
define('NO_AGENT_CHECK', true);
define('PUBLIC_AJAX_MODE', true);
define('DisableEventsCheck', true);
 
if (
    isset($_GET['site']) &&
    preg_match('/^[a-z0-9_]+$/i', $_GET['site'])
)
{
    define('SITE_ID', $_GET['site']);
}
 
require_once($_SERVER['DOCUMENT_ROOT'].'/bitrix/modules/main/include/prolog_before.php');
 
if (($_REQUEST['redirect'] ?? null) === 'upgrade')
{
    if (\Bitrix\Main\Loader::includeModule('bitrix24'))
    {
        localRedirect('/settings/license_all.php');
    }
    else
    {
        localRedirect('/bitrix/admin/update_system.php');
    }
}
 
if (\Bitrix\Main\Loader::includeModule('landing'))
{
    header('Content-Type: application/json');
    $ajaxResult = \Bitrix\Landing\PublicAction::ajaxProcessing();
    echo \Bitrix\Main\Web\Json::encode($ajaxResult);
}
 
\CMain::finalActions();