POST数据到HTTPS站点的时候需要设置ServicePointManager类的ServerCertificateValidationCallback属性,并且在POST到https://passport.baidu.com/?login时还需要将HttpWebResquest实例的ProtocolVersion属性设置为HttpVersion.Version10(这个未验证是否所有的HTTPS站点都需要设置),否则在调用GetResponse()方法时会抛出“基础连接已经关闭: 连接被意外关闭。”的异常。
//如果是发送HTTPS请求 解决基础连接已经关闭: 连接被意外关闭 if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase)) { ServicePointManager.ServerCertificateValidationCallback = CheckValidationResult; req.ProtocolVersion = HttpVersion.Version10; } private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) { return true; //总是接受 }