httpwebrequest 服务器提交了协议冲突. section=responsestatusline

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;