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;