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[ASP.net教程]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 = null; 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 } }