c# - 无法使用 https 获取网络响应

Question

我使用此代码获取网页内容，但在 WebResponse myResponse = myRequest.GetResponse();

处出现异常

HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create("https://www.ecfr.gov");
System.Net.ServicePointManager.ServerCertificateValidationCallback = delegate (Object obj, X509Certificate X509certificate, X509Chain chain, System.Net.Security.SslPolicyErrors errors)
{
    return true;
};
myRequest.Method = "GET";
WebResponse myResponse = myRequest.GetResponse();
StreamReader sr = new System.IO.StreamReader(myResponse.GetResponseStream(), System.Text.Encoding.UTF8);
string result = sr.ReadToEnd();
sr.Close();
myResponse.Close();

我知道它需要 SSL/TLS 证书，但我想知道为什么我仍然会收到错误消息？

https://www.ecfr.gov

Answer 1

试试这个

    static void Main(string[] args)
    {
        ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
        var client = new HttpClient();
        var result = client.GetAsync("https://www.ecfr.gov").Result;
        var str = result.Content.ReadAsStringAsync().Result;
    }