Angular 1.6.4 $http post callback not called

Question

I'm writing this Angular (1.6.4) service:

service.create = function(element, data) {
    var deferred = $q.defer();
    // -----------------------------------------------------------------------------
    // -- Post element
    // -----------------------------------------------------------------------------
    $http({
        method: 'POST',
        url: '/api/' + element.toLowerCase(),
        headers: {
            'Content-Type': 'application/x-www-form-urlencoded'
        },
        data: data,
        transformRequest: function(obj) {
            var str = [];
            for (var p in obj) {
                str.push(encodeURIComponent(p) + '=' + encodeURIComponent(obj[p]));
            }
            return str.join('&');
        }
    }).then(function infoCallback(response) {
        console.log('yeah!');
        deferred.resolve(response);
    }, function errorCallback(response) {
        console.error("[ FAILED ] >> " + response);
    });
    return deferred.promise;
};

Data are posted well. But I don't know why, callbacks are not called. It works well with get method.

I tried this unsuccessfully: Success Callback not called when $http post is in method scope

Thanks a lot in advance for your help.