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我尝试向 Yandex 服务语音识别引擎发出 GET 请求，以获取流识别：

GET /asr_partial HTTP/1.1\r\n
User-Agent:Ross' Third apartmentAliveClient\r\n
Host: voice-stream.voicetech.yandex.net:80\r\n
Upgrade: dictation\r\n\r\n

因此，我编写了简单的代码来做到这一点：

public string HttpGet(String serviceUri, String host, String userAgent, String upgradeValue)
    {
     req = WebRequest.Create(serviceUri)
                    as HttpWebRequest;

        req.ClientCertificates.Add(_certificat);

        req.Host = host;
        req.UserAgent = userAgent;
        req.Date = DateTime.Now;
        Console.WriteLine(req.ToString());
        req.Headers["Upgrade"] = upgradeValue;
        string result = null;
        using (HttpWebResponse resp = req.GetResponse()
                                      as HttpWebResponse)
        {
            StreamReader reader =
                new StreamReader(resp.GetResponseStream());
            result = reader.ReadToEnd();
        }
        return result;
    }

但是当我调用方法捕获异常时：

System.Net.WebException：基础连接已关闭：无法为 SSL/TLS 安全通道建立信任关系。

好的，我认为这个问题是我应该将（Yandex 站点的 CA 证书导入我的机器。所以，我尝试这样做 - 找到一些 CA -但是 -Certum，Certum Level 4 CA，但据我了解 - 它是现在，我需要什么。

好的，我编写该代码来获取证书并将其存储到文件中：

 ServicePointManager.ServerCertificateValidationCallback += new System.Net.Security.RemoteCertificateValidationCallback(customXertificateValidation);

private bool customXertificateValidation(object sender, X509Certificate cert, X509Chain chain, System.Net.Security.SslPolicyErrors error)
    {
        if (cert.Subject == "CN=*.asr.yandex.net, O=YANDEX, OU=ITO, L=Moscow, S=Russia, C=RU")
        {
            var certBytes= cert.Export(X509ContentType.Cert);
            File.WriteAllBytes("yandexCA.txt", certBytes);
            return true;
        }
        return false;
    }

然后，我修改了方法，导入证书并将其添加到请求中：

 public string HttpGet(String serviceUri, String host, String userAgent, String upgradeValue)
    {          
        _certificat = new X509Certificate2();

        var certBytes = File.ReadAllBytes("yandexCA.txt");            
        _certificat.Import(certBytes);           

        HttpWebRequest req = WebRequest.Create(serviceUri)
                    as HttpWebRequest;

        req.ClientCertificates.Add(_certificat);

        req.Host = host;
        req.UserAgent = userAgent;
        req.Date = DateTime.Now;
        Console.WriteLine(req.ToString());
        req.Headers["Upgrade"] = upgradeValue;
        string result = null;
        using (HttpWebResponse resp = req.GetResponse()
                                      as HttpWebResponse)
        {
            StreamReader reader =
                new StreamReader(resp.GetResponseStream());
            result = reader.ReadToEnd();
        }
        return result;
    }
}

证书主题：

Subject = "CN=*.asr.yandex.net, O=YANDEX, OU=ITO, L=Moscow, S=Russia, C=RU"

但错误是一样的：

System.Net.WebException：基础连接已关闭：无法为 SSL/TLS 安全通道建立信任关系。

我应该怎么做才能解决这个错误？
我需要将此证书安装到我的机器上吗？如果是的话- 怎么做？- 我只有字节数组。

PS在我使用回调的代码中：

 ServicePointManager.ServerCertificateValidationCallback += new System.Net.Security.RemoteCertificateValidationCallback(customXertificateValidation);

所以，回应是：

System.dll 中发生“System.Net.WebException”类型的未处理异常
附加信息：远程服务器发送消息：（501）不支持。

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