C# HttpWebRequest - PreAuthenticate：仍然返回 401 禁止 (HTTPS)

Question

我想请您帮助我快速编写以下代码，因为我总是收到“403 FORBIDDEN”。

HttpWebRequest pozadavek = (HttpWebRequest)WebRequest.Create("LINK THAT ASKS FOR AUTHLOGIN"); //https
    System.IO.StreamReader stream = null;
    System.String result = null;
    public Form1()
    {
        InitializeComponent();
        pozadavek.AuthenticationLevel = System.Net.Security.AuthenticationLevel.MutualAuthRequested;
        pozadavek.Credentials = new NetworkCredential("NAME", "PASS");
        pozadavek.PreAuthenticate = true;
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        WebResponse webresponse = pozadavek.GetResponse(); //throws an exception:403 forbidden
        stream = new System.IO.StreamReader(webresponse.GetResponseStream());
        result = stream.ReadToEnd();
        this.webBrowser1.DocumentText = result;
    }

Answer 1

您尝试打开的网站需要基本身份验证。最重要的是，您需要在您的请求中包含以 base64 编码的用户名/密码。幸运的是，.Net 可以为您做到这一点。像这样构建您的请求：

var credCache = new CredentialCache();
credCache.Add(new Uri("https://is.vsfs.cz/auth"), "Basic",
                  new NetworkCredential("user", "pwd"));
var request = (HttpWebRequest)WebRequest.Create(uri);
request.Credentials = credCache;

这里有一篇文章更详细地解释了 .Net 中如何处理各种身份验证方案。