c# - WebRequest 没有被重定向

Question

方法:

public RequestTest Test(string url)
    {
        var test = new RequestTest() { Url = url };
        var sw = new Stopwatch();
        var request = WebRequest.CreateHttp(test.Url);
        request.AllowAutoRedirect = true;
        request.Method = "HEAD";
        request.UserAgent = "Accept-Language: en-US,en;q=0.5";
        try
        {
            sw.Start();
            using (var response = (HttpWebResponse)request.GetResponse())
            {
                sw.Stop();
                test.Time = (int)sw.ElapsedMilliseconds;
                test.StatusCode = response.StatusCode;
            }
            return test;
        }
        catch (WebException ex)
        {
            test.StatusCode = ((HttpWebResponse)ex.Response).StatusCode;
            return test;
        }
    }

网址是 http://monosnap.com/page/faq ，必须重定向到某些语言区域，例如 - http://monosnap.com/ru/page/faq

但它会抛出 WebException，并显示消息“无法解析远程名称:'page'”。

更新:我添加用户代理

request.UserAgent = "Accept-Language: en-US,en;q=0.5";

但我仍然遇到相同的异常“无法解析远程名称:'page'”此外，重定向在我的浏览器中正常工作。所以，问题出在代码上。

Answer 1

对于您尝试访问的站点，只需添加一个“Accept-Language” header ，如下所示:

using System;
using System.Diagnostics;
using System.Net;

namespace ConsoleApplication1
{
    class Program
    {

        public class RequestTest
        {
            public string Url { get; set; }
            public int Time { get; set; }
            public HttpStatusCode StatusCode { get; set; }
        }

        public static RequestTest Test(string url)
        {
            var test = new RequestTest() { Url = url };
            var sw = new Stopwatch();
            var request = WebRequest.CreateHttp(test.Url);
            request.AllowAutoRedirect = true;
            request.Method = "HEAD";
            request.Headers.Add("Accept-Language: ru-RU, en; q = 0.5");
            try
            {
                sw.Start();
                using (var response = (HttpWebResponse)request.GetResponse())
                {
                    sw.Stop();
                    test.Time = (int)sw.ElapsedMilliseconds;
                    test.StatusCode = response.StatusCode;
                }
                return test;
            }
            catch (WebException ex)
            {
                test.StatusCode = ((HttpWebResponse)ex.Response).StatusCode;
                return test;
            }
        }

        static void Main(string[] args)
        {
            var x =  Test("http://monosnap.com/page/faq");
            Console.WriteLine(x.StatusCode + " " + x.Time.ToString());
            Console.ReadLine();

        }
    }
}

示例输出:

OK 186

如果无法确定语言，则重定向器似乎没有默认设置。

有关设置接受语言的更多信息:Setting language preferences in a browser .