C# POST提交数据https拒绝服务_c# http提交数据 被拒绝

HTTPS协议请求需要设置安全协议，代码如下

  public static string Post(string url, string param)
  {
    string result = "";
    System.Net.HttpWebRequest req = System.Net.WebRequest.Create(url) as System.Net.HttpWebRequest;
    if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
    {
      System.Net.ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);
      req.ProtocolVersion = System.Net.HttpVersion.Version11;
      // 这里设置了协议类型。
      System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12; // SecurityProtocolType.Tls1.2; 
      req.KeepAlive = false;
      System.Net.ServicePointManager.CheckCertificateRevocationList = true;
      System.Net.ServicePointManager.DefaultConnectionLimit = 100;
      System.Net.ServicePointManager.Expect100Continue = false;
    }
    req.Method = "POST";
    req.ContentType = "application/x-www-form-urlencoded";
    req.Referer = null;
    req.AllowAutoRedirect = true;
    req.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
    req.Accept = "*/*";
    byte[] data = System.Text.Encoding.UTF8.GetBytes(param); // 把字符串转换为字节
    req.ContentLength = data.Length; //请求长度
    using (System.IO.Stream reqStream = req.GetRequestStream()) // 获取
    {
      reqStream.Write(data, 0, data.Length);// 向当前流中写入字节
      reqStream.Close(); // 关闭当前流
    }

    System.Net.HttpWebResponse resp = (System.Net.HttpWebResponse)req.GetResponse(); //响应结果
    System.IO.Stream stream = resp.GetResponseStream();
    //获取响应内容
    using (System.IO.StreamReader reader = new System.IO.StreamReader(stream, System.Text.Encoding.UTF8))
    {
      result = reader.ReadToEnd();
    }
    return result;
  }
  private static bool CheckValidationResult(object sender, 
    System.Security.Cryptography.X509Certificates.X509Certificate certificate, 
    System.Security.Cryptography.X509Certificates.X509Chain chain, 
    System.Net.Security.SslPolicyErrors errors)
  {
    return true; // 总是接受  
  }
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