c#之WebRequest 没有被重定向

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。

请您参考如下方法:

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 .