httpclient域名验证

using System;
using System.Net.Http;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;

class Program
{
    static void Main()
    {
        var handler = new HttpClientHandler();
        handler.ServerCertificateCustomValidationCallback = (sender, cert, chain, sslPolicyErrors) =>
        {
            // 自定义验证逻辑
            if (sslPolicyErrors == SslPolicyErrors.None)
                return true;

            Console.WriteLine($"Certificate error: {sslPolicyErrors}");
            return false;
        };

        using (var client = new HttpClient(handler))
        {
            try
            {
                var response = client.GetAsync("https://example.com").Result;
                Console.WriteLine(response.StatusCode);
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Request failed: {ex.Message}");
            }
        }
    }
}