C＃WebRequest（400）第二次调用时请求错误

Question

我正在尝试使用程序检查我们的SSL证书，但是我遇到了问题； 由于某些原因，我无法使用第二个HttpWebRequest。 我以为这是一个缓存问题，并使用了我所知道的所有无缓存代码。 如您所见，服务器位于我们的专用子网中，其中一台服务器具有大量IIS应用程序。 因此，我将“ request.Host”变量更改为我们匹配的IIS绑定，以打开网站。 总是第二个无效，但第一个有效。 问题是什么？

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://" + "10.10.11.100");
            request.AllowAutoRedirect = false;
            request.Host = "www.xxx.com";
            request.Timeout = 30 * 1000;
            request.Headers.Add("Cache-Control", "no-cache");
            request.Referer = null;
            request.CachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore);
            using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
            {
                //retrieve the ssl cert and assign it to an X509Certificate object
                X509Certificate cert = request.ServicePoint.Certificate;
                //convert the X509Certificate to an X509Certificate2 object by passing it into the constructor
                X509Certificate2UI.DisplayCertificate(new X509Certificate2(cert));
            }
            HttpWebRequest request2 = (HttpWebRequest)WebRequest.Create("https://" + "10.10.11.100");
            request2.AllowAutoRedirect = false;
            request2.Host = "www.yyy.com";
            request2.Timeout = 30 * 1000;
            request2.Headers.Add("Cache-Control", "no-cache");
            request2.Referer = null;

            request2.CachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore);
            using (HttpWebResponse response2 = (HttpWebResponse)request2.GetResponse())
            {
                //retrieve the ssl cert and assign it to an X509Certificate object
                X509Certificate cert2 = request2.ServicePoint.Certificate;
                //convert the X509Certificate to an X509Certificate2 object by passing it into the constructor
                X509Certificate2UI.DisplayCertificate(new X509Certificate2(cert2));
            }

错误：

        The remote server returned an error: (400) Bad Request.

例外行：

using (HttpWebResponse response2 = (HttpWebResponse)request2.GetResponse()) 

状态：ProtocolError

内部状态：RequestFatal

Answer 1

我解决了我的问题。 问题是保持活动属性，并且由于第二个SSL连接未正确初始化。 您必须将此行添加到您的请求中。

        request.KeepAlive = false;