控制器不存在:mod=viewthread

        if ($this->param['auto_search']) {
            $controller = $this->autoFindController($module, $path);
        } else {
            // 解析控制器
            $controller = !empty($path) ? array_shift($path) : null;
        }

        if ($controller && !preg_match('/^[A-Za-z](\w|\.)*$/', $controller)) {
            throw new HttpException(404, 'controller not exists:' . $controller);
        }

        // 解析操作
        $action = !empty($path) ? array_shift($path) : null;

        // 解析额外参数
        if ($path) {
            if ($this->rule->getConfig('url_param_type')) {
                $var += $path;