使用HttpWebRequest请求https链接时，无法访问的问题，设置ServicePointManager.SecurityProtocol安全协议

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本文介绍了在C# .NET 4.0环境下，使用HttpWebRequest访问HTTPS链接遇到问题时，如何通过设置ServicePointManager.SecurityProtocol为TLS1.2来解决因不支持高级加密协议导致的访问失败问题。

//请求前设置一下使用的安全协议类型 System.Net
if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase)){
    ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback((object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) =>
    {
       return true; //总是接受  
    });
    ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
}

namespace System.Net
{
    [System.Flags]
    public enum SecurityProtocolType
    {
       Ssl3 = 48,
       Tls = 192,
       Tls11 = 768,
       Tls12 = 3072,
    }
}

c# .net 4.0 HttpWebRequest 访问https TLS1.2 解决方案

    public static string DoRequest(string Url, string cookieStr)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);

            request.Timeout = 1000 *900;

            request.Headers.Add(HttpRequestHeader.Cookie, cookieStr);

            request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36";

            ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;// SecurityProtocolType.Tls1.2;

            string back ="";
            try {
                        WebResponse response = request.GetResponse();
                        StreamReader reader = new StreamReader(response.GetResponseStream(), System.Text.Encoding.UTF8);
                         back = reader.ReadToEnd();
                        reader.Close();
                        reader.Dispose();
                        response.Close();
            }
            catch(Exception ex){

                back = ex.Message;
            }



            return back;
        }