AngularJS 1.x & ui.router: How to show 404 stage by staying on the same URL.

foo.js

angular.config(function($urlRouterProvider, $stateProvider) {
  $stateProvider.state('404Page', { template: '404' });
  
  $urlRouterProvider.otherwise(function($injector, $location) {
    $injector.get('$state').go('404Page', {}, { location: false });
    
    return $location.path();
  });
});