try
        {
            HttpClient client = new HttpClient();
            client.MaxResponseContentBufferSize = BUFFER_SIZE;
            client.DefaultRequestHeaders.Add(CULTURE_ID, "es");
            client.DefaultRequestHeaders.Add(VALUE, LAST_WEEK_VALUE);
            client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue(BEARER, token);

            var content = new StringContent("", System.Text.Encoding.UTF8, APPLICATION_JSON);

            HttpResponseMessage response = await client.GetAsync(url);
            var result = await response.Content.ReadAsStringAsync();
            List<SubProductParser> prices;
            try
            {
                prices = JsonConvert.DeserializeObject<List<SubProductParser>>(result);
            }
            catch
            {
                // exception missin the final character in JSON "]"
            }

            return prices.ElementAt(0);

        }
        catch
        {
            return null;
        }

private async void Handle_Item_Tapped(object sender, ItemTappedEventArgs e)
    {
        var selected = e.Item as ProductParser;
        var lastPrice= await ApiConnector.GetLastWeekSubProductPrices(App.ViewModel.LoginViewModel.SesionToken,
                                                                                                                subCatViewModel.Selected.ProductId,
                                                                                                                subCatViewModel.Selected.Id);
        await subCatViewModel.IsFavorite();
        subCatViewModel.BarViewModel.Selected = selected;
        subCatViewModel.BarViewModel.Categories = _categories;
        subCatViewModel.LinearViewModel.Selected = selected;
        subCatViewModel.LinearViewModel.Categories = _categories;
        await Navigation.PushAsync(new Graphs(subCatViewModel));

    }