我如何从一个401服务器错误头 [英] How do I get headers from a 401 Server Error

问题描述

我正在写一个端口扫描检测本地网络上运行的Web服务。其中的一些网络服务需要基本身份验证 - 我不知道用户名/密码为这些服务，我只是想一一列举，所以在这个阶段，我不能提供凭据。我使用的是code：

I'm writing a port scanner to detect web services running on the local network. Some of these web services require basic authentication - I don't know the username/ password for these services, I just want to list them, so I can't provide the credentials at this stage. I'm using the code:

                    var request = (HttpWebRequest)WebRequest.Create("http://" + req);
                    request.Referer = "";
                    request.Timeout = 3000;
                    request.UserAgent = "Mozilla/5.0";
                    request.AllowAutoRedirect = false;
                    request.Method = WebRequestMethods.Http.Head;

                    HttpWebResponse response = null;

                    try
                    {
                        response = (HttpWebResponse) request.GetResponse();
                        // I want to parse the headers here for the server name but as the exception is thrown the response object is null.

                    }
                    catch (Exception ex)
                    {
                        //401 error is caught here - response is null
                    }

我再解析出服务器的名字从返回的头 - 我知道他们正在返回，因为我可以看到他们与小提琴手，但HttpWebResponse对象设置为null作为的GetResponse（）方法抛出异常。基本上 - 我怎么得到它不抛出和异常，但随着401状态code返回头

I'm then parsing out the server name from the headers that are returned - I know they are being returned because I can see them with fiddler but the HttpWebResponse object is set to null as the GetResponse() method is throwing an exception. Basically - how do I get it to not throw and exception but return the headers along with a status code of 401.

推荐答案

如果你发现一个 WebException ，你将有机会获得 ex.Response ，并从那里你可以检索你的头。

If you catch a WebException you'll have access to ex.Response and you can retrieve your headers from there.

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