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。

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namespace System.Net
{ using System;
    
    [Flags] public enum SecurityProtocolType
    {
        Ssl3 = 0x30,
        Tls = 0xc0,
        Tls11 = 0x300,
        Tls12 = 0xc00 }
}
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还有一点此处的https必须是.netframework4.5及以上才能使用,

否则执行到这行代码的时候,会抛出The requested security protocol is not supported异常

ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;

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

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    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   }
    }
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ZHUWEI 2017-08-30 12:46:54 评论(0) 浏览(1) 赞(0) 踩(0)

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