HttpClient TDA.cs

    interface IFooStatusReportsListener
    {
        void Notify(string productName, BarStatus[] barStatuses);
    }

    class BarClient
    {
        readonly HttpClient _httpClient = new HttpClient {BaseAddress = new Uri("https://bar.example.com/")};

        public async void UpdateShippingStatusReports(string product, IFooStatusReportsListener listener)
        {
            var httpResponseMessage = await this._httpClient.GetAsync($"something/{product}").ConfigureAwait(false);
            var result = await httpResponseMessage.EnsureSuccessStatusCode()
                .Content.ReadAsAsync<BarStatus[]>().ConfigureAwait(false);
            listener.Notify(product, result);
        }
    }