AngularJS UI router handling 404s

Question

I have an app with a service which wraps my API calls:

var ConcernService = {
    ...
    get: function (items_url, objId) {
        var defer = $q.defer();
        $http({method: 'GET', 
            url: api_url + items_url + objId}).
            success(function (data, status, headers, config) {
                defer.resolve(data);
            }).error(function (data, status, headers, config) {
                console.log('ConcernService.get status',status);
                defer.reject(status);
            });
        return defer.promise;
    },

and I'm using UI-Router to transition between states:

concernsApp

    .config( function ($stateProvider, $urlRouterProvider) {

        $urlRouterProvider.otherwise("/404/");


        $stateProvider.state('project', {
        url: '/project/:projectId/',
        resolve: {
            project: function ($stateParams, ConcernService) {
                return ConcernService.get('projects/', $stateParams.projectId);
            },
        },
        views: {
            ...
        }
    });

I'm moving from using the normal AngularJS router and I'm having difficulty understanding how to implement 404s. I can see the ConcernService throwing the console.log status as rejected, but how do I catch this in the state router?

Answer 1

I differ between two 404 states:

Server:

• show 404 page depending on server response HTTP Code 404
• important to define no URL, so that user stays on URL where the error happened

Client:

• URL is not found by angular ui router (none of defined URLs)

---

Code for Angular UI-Router state:

$stateProvider
  .state('404server', {
    templateUrl: '/views/layouts/404.html'
  })
  .state('404client', {
    url: '*path',
    templateUrl: '/views/layouts/404.html'
  });

Code in $httpProvider interceptor:

if(response.status === 404) {
  $injector.get('$state').go('404server');
}

And why I used $injector instead of $state is explained here.