mtv\http\Http404::display_message PHP Method

    public function display_message()
    {
        global $wp_query;
        $wp_query->is_404 = true;
        if ($this->getPrevious()) {
            $ex = $this->getPrevious();
        } else {
            $ex = $this;
        }
        shortcuts\set_query_flags(array('page', '404'));
        shortcuts\display_template('404.html', array('exception_class' => get_class($ex), 'exception' => $ex, 'globals' => $GLOBALS, 'post' => $_POST, 'get' => $_GET, 'server' => $_SERVER));
        exit;
    }