Discuz您当前的访问请求当中含有非法字符的解决方法

故障描述：
退出登录时出现”您当前的访问请求当中含有非法字符，已经被系统拒绝“错误。如下图：

解决方法：
打开 \\source\\class\\discuz\\discuz_application.php 文件
找到
private function _xss_check() {

    static $check = array(\'\"\', \'>\', \'<\', \'\\\'\', \'(\', \')\', \'CONTENT-TRANSFER-ENCODING\');

    if(isset($_GET[\'formhash\']) && $_GET[\'formhash\'] !== formhash()) {
        system_error(\'request_tainting\');
    }

    if($_SERVER[\'REQUEST_METHOD\'] == \'GET\' ) {
        $temp = $_SERVER[\'REQUEST_URI\'];
    } elseif(empty ($_GET[\'formhash\'])) {
        $temp = $_SERVER[\'REQUEST_URI\'].file_get_contents(\'php://input\');
    } else {
        $temp = \'\';
    }

    if(!empty($temp)) {
        $temp = strtoupper(urldecode(urldecode($temp)));
        foreach ($check as $str) {
            if(strpos($temp, $str) !== false) {
                system_error(\'request_tainting\');
            }
        }
    }

    return true;
}
修改为
private function _xss_check() {
    $temp = strtoupper(urldecode(urldecode($_SERVER[\'REQUEST_URI\'])));
    if(strpos($temp, \'<\') !== false || strpos($temp, \'\"\') !== false || strpos($temp, \'CONTENT-TRANSFER-ENCODING\') !== false) {
        system_error(\'request_tainting\');
    }
    return true;
}