调用接口的时候，包：
httpwebrequest 服务器提交了协议冲突. section=responsestatusline
解决方案：
req.KeepAlive = false;
req.AllowAutoRedirect = true;
req.CookieContainer = new System.Net.CookieContainer();
ServicePointManager.Expect100Continue = false;
ServicePointManager.MaxServicePointIdleTime = 2000;