Is it possible to restrict a route for AJAX only?

Is it possible to restrict a Symfony 2 route for XHR requests only? I want to declare routes, which are only accessible via AJAX.

I do not want to put some extra lines into each AJAX-specific-actions like that:

if ($request->isXmlHttpRequest()) {
    // do something
} else {
    // do something else
}

I want to define:

• one rule for AJAX requests
• one rule for GET/POST requests to the same URL

in order to get around having conditions like above.