编辑：我想回来需要注意的是，问题并不在我结束所有，而是与另一家公司的一面code

我试图拉起使用基本身份验证的页面。我不断收到一个404页没有发现错误。我可以复制和粘贴我的网址到浏览器中，它工作正常（如果我没有登录到它会弹出一个凭证中他们已经部位，否则会打开什么，我想它来打开）。我一定是在正确的地方和认证，因为我得到一个401（未经过验证错误），如果我intentially放在一个错误的用户名/密码，我得到一个内部服务器错误500，如果我传递一个错误的参数在查询字符串。我已经使用Web客户端尝试和HttpWebRequest的两个领先同一个404未找​​到错误。

使用Web客户端：

 字符串的URL =MyValidURLwithQueryString;
        Web客户端的客户端=新的Web客户端（）;
        字符串username =名为myusername;
        字符串password =输入mypassword;
        字符串凭证= Convert.ToBase64String（Encoding.ASCII.GetBytes（用户名+：+密码））;
        client.Headers [Htt的prequestHeader.Authorization] =基本+证书;
        VAR的结果= client.DownloadString（URL）;
        回复于（结果）;
 

使用HttpWebRequest的

  HttpWebRequest的要求=（HttpWebRequest的）WebRequest.Create（MyValidURL）;
        字符串AUTHINFO =用户名：密码;
        AUTHINFO = Convert.ToBase64String（Encoding.Default.GetBytes（AUTHINFO））;
        request.Headers.Add（授权，基本+ AUTHINFO）;
        request.Credentials =新的NetworkCredential（用户名，密码）;
        request.Method = WebRequestMethods.Http.Get;
        request.AllowAutoRedirect = TRUE;
        request.Proxy = NULL;
        HttpWebResponse响应=（HttpWebResponse）request.GetResponse（）;
        流流= response.GetResponseStream（）;
        StreamReader的StreamReader的=新的StreamReader（流）;
        字符串s = streamreader.ReadToEnd（）;
        回复于（S）;
 

解决方案

  //当心
//这个只有当服务器返回401首
//客户端不发出的第一个请求凭据
//只有经过401
client.Credentials =新的NetworkCredential（用户名，密码）; //不工作

//所以用这个来代替发送凭据马上
字符串凭证= Convert.ToBase64String（
    Encoding.ASCII.GetBytes（用户名+：+密码））;
client.Headers [Htt的prequestHeader.Authorization] =的String.Format（
    基本{0}，证书）;
 

Edit: I wanted to come back to note that the problem wasn't on my end at all, but rather with with code on the other company's side.

I'm trying to pull up a page using Basic Authentication. I keep getting a 404 Page not found error. I can copy and paste my url into the browser and it works fine (if I'm not logged into their site already it pops up a credential box, otherwise it opens what I want it to open). I must be getting to the right place and authenticating, because I get a 401 (not authenticated error) if I intentially put in a bad username/password and I get an internal server error 500 if I pass it a bad parameter in the query string. I've tried using Webclient and HttpWebRequest both leading to the same 404 not found error.

With Webclient:

        string url = "MyValidURLwithQueryString";
        WebClient client = new WebClient();
        String userName = "myusername";
        String passWord = "mypassword";
        string credentials = Convert.ToBase64String(Encoding.ASCII.GetBytes(userName + ":" + passWord));
        client.Headers[HttpRequestHeader.Authorization] = "Basic " + credentials;
        var result = client.DownloadString(url);
        Response.Write(result);

With HttpWebRequest

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create("MyValidURL");
        string authInfo = "username:password";
        authInfo = Convert.ToBase64String(Encoding.Default.GetBytes(authInfo));
        request.Headers.Add("Authorization", "Basic " + authInfo);
        request.Credentials = new NetworkCredential("username", "password");
        request.Method = WebRequestMethods.Http.Get;
        request.AllowAutoRedirect = true;
        request.Proxy = null;
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        Stream stream = response.GetResponseStream();
        StreamReader streamreader = new StreamReader(stream);
        string s = streamreader.ReadToEnd();
        Response.Write(s);

//BEWARE
//This works ONLY if the server returns 401 first
//The client DOES NOT send credentials on first request
//ONLY after a 401
client.Credentials = new NetworkCredential(userName, passWord); //doesnt work

//So use THIS instead to send credentials RIGHT AWAY
string credentials = Convert.ToBase64String(
    Encoding.ASCII.GetBytes(userName + ":" + password));
client.Headers[HttpRequestHeader.Authorization] = string.Format(
    "Basic {0}", credentials);