使用HttpWebRequest时GetResponse未返回

using System;
using System.Net;

public class HttpExample
{
    public static void Main()
    {
        string url = "http://example.com";
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        request.Timeout = 60000; // 设置超时时间为60秒

        try
        {
            using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
            {
                Console.WriteLine("Response Status Code: " + (int)response.StatusCode);
                // 进一步处理响应...
            }
        }
        catch (WebException ex)
        {
            Console.WriteLine("An error occurred: " + ex.Message);
            if (ex.Response != null)
            {
                using (HttpWebResponse errorResponse = (HttpWebResponse)ex.Response)
                {
                    Console.WriteLine("Error Status Code: " + (int)errorResponse.StatusCode);
                }
            }
        }
    }
}