C# POST Https请求的一些坑

写在前面：

　　从上次，跟合作方的站点对接开始就产生了这个问题，当时用C#进行POST提交，总是会出现问题，找了很久发现对方的站点居然是TLS 1.2 的。

正文：

然而,在.NET FrameWork 4.0的环境下，居然找不到。。。System.Net.SecurityProtocolType 这个枚举，没有这个值。。。

所以，在POST提交的时候，是会出现问题，有的网站就不会有这个问题，因为他们是1.0的。



　　所以啊，感觉这就是一个坑，好在，即使没有现成的，1.2我们也是可以用代码来实现1.2的

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

当然，如果是4.0以后的环境，查看这个枚举是可以看到不同的值的。

namespace System.Net
{
using System;

[Flags]
public enum SecurityProtocolType
{
Ssl3 = 0x30,
Tls = 0xc0,
Tls11 = 0x300,
Tls12 = 0xc00
}
}

，，，，到这里，该说的，都说了，最后附上，C# https POST的代码吧。

class ProgramTest
{
static void Main(string[] args)
{
string url = "https://www.test.com";
string result = PostUrl(url, "key=123"); // key=4da4193e-384b-44d8-8a7f-2dd8b076d784
Console.WriteLine(result);
Console.WriteLine("OVER");
Console.ReadLine();
}

private static string PostUrl(string url, string postData)
{
HttpWebRequest request = null;
if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
{
request = WebRequest.Create(url) as HttpWebRequest;
ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
request.ProtocolVersion = HttpVersion.Version11;
　　　　　　　　　// 这里设置了协议类型。
ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;// SecurityProtocolType.Tls1.2;
request.KeepAlive = false;
ServicePointManager.CheckCertificateRevocationList = true;
ServicePointManager.DefaultConnectionLimit = 100;
ServicePointManager.Expect100Continue = false;
}
else
{
request = (HttpWebRequest)WebRequest.Create(url);
}

request.Method = "POST";    //使用get方式发送数据
request.ContentType = "application/x-www-form-urlencoded";
request.Referer = null;
request.AllowAutoRedirect = true;
request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
request.Accept = "*/*";

byte[] data = Encoding.UTF8.GetBytes(postData);
Stream newStream = request.GetRequestStream();
newStream.Write(data, 0, data.Length);
newStream.Close();

//获取网页响应结果
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream stream = response.GetResponseStream();
//client.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
string result = string.Empty;
using (StreamReader sr = new StreamReader(stream))
{
result = sr.ReadToEnd();
}

return result;
}

private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
{
return true; //总是接受
}
}