HttpResponseMessage - 将内容复制到流时出错

Question

我在发布消息时收到以下异常.不知道为什么会这样.有数据点吗？

将内容复制到流时出错

var client = new HttpClient(new HttpClientHandler()
            {
                UseDefaultCredentials = true
            });
            client.BaseAddress = new Uri(Convert.ToString(ConfigurationManager.AppSettings["ServiceMethodUrl"]));
            var javaScriptSerializer = new System.Web.Script.Serialization.JavaScriptSerializer();
            string jsonString = javaScriptSerializer.Serialize(payload);
            var httpContent = new StringContent(jsonString, Encoding.UTF8, "application/JSON");

            HttpResponseMessage response=client.PostAsync("api/event/PostEventStatus", httpContent).Result;

            return response.StatusCode;