cache_handler.php

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<?php
// if 500 is returned, output will not be shown to the user.
header('Content-Type: application/javascript;charset=utf-8');
header('Cache-Control: no-cache, must-revalidate');
?>
//<script>
!function(){
    if (!window.__cache_handler) {
        window.__cache_handler = 1;
        var msg = 'Update your web server configuration (e.g. .htaccess). See docs/admin/upgrading';
        console.log(msg);
        var html = '<h3 style="color:red">' + msg + '</h3>';
        document.querySelector('body').insertAdjacentHTML('afterbegin', html);
    }
}();