Send $http.get twice

I have the following code to load a page https://localhost:3000/#/home, which get all the posts from the database and display them.

The problem is that, I realise the log router.get /posts is print twice, whereas here and there are only alerted once.

Does anyone know if it means that $http.get is undertaken twice? If so, where is the problem?

app.config(... ...) {
    $stateProvider
        .state('global', {
            templateUrl: '/htmls/global.html',
            controller: 'GlobalCtrl'
        })
        .state('global.home', {
            url: '/home',
            templateUrl: '/htmls/home.html',
            controller: 'MainCtrl',
            resolve: {
                postPromise: ['posts', function (posts) {
                    return posts.getAll();
                }]
            }
        });
}]);

app.factory('posts', ['$http', 'auth', function ($http, auth) {
    var o = { posts: [] };

    o.getAll = function () {
        alert("before");
        return $http.get('/posts').then(function (res) {
            alert("after");
            angular.copy(res.data, o.posts);
        })
    }
    ... ...
}]);

app.controller('GlobalCtrl', [function () { }]);

app.controller('MainCtrl', ['$scope', 'posts', 'auth', 'postPromise', function ($scope, posts, auth, postPromise) {
    ... ...

In the backend:

router.get('/posts', function (req, res, next) {
    console.log("router.get /posts");
    Post.find(function (err, posts) {
        if (err) return next(err);
        res.json(posts);
    });
});

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