public async System.Threading.Tasks.Task TestGet()
        {
            var html = session.Get("http://time.tianqi.com/") as string;

            Assert.IsNotNull(
                html
                );
            var html2 = await session.GetAsync("http://time.tianqi.com/") as string;

            Assert.AreEqual(html.Substring(0, 300), html2.Substring(0, 300));
            Assert.IsTrue(html.IndexOf("北京时间校准") != -1);
        }