Whats the angular way of autodirecting incomplete url's?

when i want to get to

http://www.koran-auf-deutsch.de/koran-deutsch/23-die-glaubigen-al-mominun/

and just enter

http://www.koran-auf-deutsch.de/koran-deutsch/23

i get directly to the url. i would like to get a similar behaviour in my angular app, where would you inject that functionality? any ideas?

angular.module('app', []).
  config(['$routeProvider', function($routeProvider) {
  $routeProvider.
      when('/:id', {controller: RedirectCtrl}).
      when('/:id/:title', {templateUrl: 'partials/post.html', controller: PostCtrl}).
      otherwise({redirectTo: '/404'});
}]);

function RedirectCtrl($routeParam, $http) {

    var post_id = $routeParams.id;

    // get title by id
    $http.get('/api_url_to_get_title_by_id').success(function (data) {
        window.location = "/" + post_id + "/" + data.title;
    });
}

RedirectCtrl.$inject = ['$routeParams', '$http'];