基础连接已关闭：远程服务器上的发送发生意外错误

Question

当我尝试使用https方向调用远程站点上的REST服务时，出现以下错误：

  

基础连接已关闭：发送时发生意外错误。

这是我的代码：

 public MyWebRequest(string url, string method, string data)
    {
        Uri uri = new Uri(url);

        HttpWebRequest request = WebRequest.Create(uri) as HttpWebRequest;
        request.ContentType = "application/json";
        request.Method = method;
        request.ContentLength = data.Length;

        string base64Credentials = GetEncodedCredentials(); // check below
        request.Headers.Add("Authorization", "Basic " + base64Credentials);


        System.Net.ServicePointManager.ServerCertificateValidationCallback +=
            delegate(object sender, System.Security.Cryptography.X509Certificates.X509Certificate certificate,
                                    System.Security.Cryptography.X509Certificates.X509Chain chain,
                                    System.Net.Security.SslPolicyErrors sslPolicyErrors)
            {
                return true; // **** Always accept
            };


        // -------------> The next line makes the error <------------------
        using (StreamWriter writer = new StreamWriter(request.GetRequestStream()))
        {
            writer.Write(data);
        }



        HttpWebResponse response = request.GetResponse() as HttpWebResponse;

        string result = string.Empty;
        using (StreamReader reader = new StreamReader(response.GetResponseStream()))
        {
            result = reader.ReadToEnd();
        }

        Console.Write("Resultado: "+result);
    }

此外，我已添加下一条指令以禁用https方向的证书验证，但它不起作用...

System.Net.ServicePointManager.ServerCertificateValidationCallback +=
            delegate(object sender, System.Security.Cryptography.X509Certificates.X509Certificate certificate,
                                    System.Security.Cryptography.X509Certificates.X509Chain chain,
                                    System.Net.Security.SslPolicyErrors sslPolicyErrors)
            {
                return true;
            };