59

编辑：我想回过头来指出问题根本不是我的问题，而是另一家公司的代码。

我正在尝试使用基本身份验证拉出一个页面。我不断收到 404 Page not found 错误。我可以将我的网址复制并粘贴到浏览器中，它工作正常（如果我还没有登录到他们的网站，它会弹出一个凭据框，否则它会打开我想要打开的内容）。我必须到达正确的位置并进行身份验证，因为如果我故意输入错误的用户名/密码，我会得到一个 401（未验证的错误），如果我在查询字符串中传递一个错误的参数，我会得到一个内部服务器错误 500 . 我尝试使用 Webclient 和 HttpWebRequest 都导致相同的 404 not found 错误。

使用网络客户端：

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);

使用 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);
4

4 回答 4

120 
//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);
于 2014-09-24T12:27:47.560 回答
29

尝试将 Web 客户端请求身份验证部分更改为：

NetworkCredential myCreds = new NetworkCredential(userName, passWord);
client.Credentials = myCreds;

然后打你的电话，对我来说似乎工作得很好。

于 2013-04-16T18:44:04.437 回答
13

这部分代码对我来说很好用：

        WebRequest request = WebRequest.Create(url);
        request.Method = WebRequestMethods.Http.Get;
        NetworkCredential networkCredential = new NetworkCredential(logon, password); // logon in format "domain\username"
        CredentialCache myCredentialCache = new CredentialCache {{new Uri(url), "Basic", networkCredential}};
        request.PreAuthenticate = true;
        request.Credentials = myCredentialCache;
        using (WebResponse response = request.GetResponse())
        {
            Console.WriteLine(((HttpWebResponse)response).StatusDescription);

            using (Stream dataStream = response.GetResponseStream())
            {
                using (StreamReader reader = new StreamReader(dataStream))
                {
                    string responseFromServer = reader.ReadToEnd();
                    Console.WriteLine(responseFromServer);
                }
            }
        }
于 2015-05-20T13:20:20.783 回答
3

如果它在您使用浏览器时工作，然后第一次传递您的用户名和密码 - 那么这意味着一旦完成身份验证，您的浏览器的请求标头设置为所需的身份验证值，然后每次传递向托管服务器发出请求。

因此，从检查请求标头开始（这可以使用 Web 开发人员工具完成），一旦确定标头中需要的内容，您就可以在 HttpWebRequest 标头中传递它。

摘要式身份验证示例：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.Text.RegularExpressions;
using System.Net;
using System.IO;

namespace NUI
{
    public class DigestAuthFixer
    {
        private static string _host;
        private static string _user;
        private static string _password;
        private static string _realm;
        private static string _nonce;
        private static string _qop;
        private static string _cnonce;
        private static DateTime _cnonceDate;
        private static int _nc;

public DigestAuthFixer(string host, string user, string password)
{
    // TODO: Complete member initialization
    _host = host;
    _user = user;
    _password = password;
}

private string CalculateMd5Hash(
    string input)
{
    var inputBytes = Encoding.ASCII.GetBytes(input);
    var hash = MD5.Create().ComputeHash(inputBytes);
    var sb = new StringBuilder();
    foreach (var b in hash)
        sb.Append(b.ToString("x2"));
    return sb.ToString();
}

private string GrabHeaderVar(
    string varName,
    string header)
{
    var regHeader = new Regex(string.Format(@"{0}=""([^""]*)""", varName));
    var matchHeader = regHeader.Match(header);
    if (matchHeader.Success)
        return matchHeader.Groups[1].Value;
    throw new ApplicationException(string.Format("Header {0} not found", varName));
}

private string GetDigestHeader(
    string dir)
{
    _nc = _nc + 1;

    var ha1 = CalculateMd5Hash(string.Format("{0}:{1}:{2}", _user, _realm, _password));
    var ha2 = CalculateMd5Hash(string.Format("{0}:{1}", "GET", dir));
    var digestResponse =
        CalculateMd5Hash(string.Format("{0}:{1}:{2:00000000}:{3}:{4}:{5}", ha1, _nonce, _nc, _cnonce, _qop, ha2));

    return string.Format("Digest username=\"{0}\", realm=\"{1}\", nonce=\"{2}\", uri=\"{3}\", " +
        "algorithm=MD5, response=\"{4}\", qop={5}, nc={6:00000000}, cnonce=\"{7}\"",
        _user, _realm, _nonce, dir, digestResponse, _qop, _nc, _cnonce);
}

public string GrabResponse(
    string dir)
{
    var url = _host + dir;
    var uri = new Uri(url);

    var request = (HttpWebRequest)WebRequest.Create(uri);

    // If we've got a recent Auth header, re-use it!
    if (!string.IsNullOrEmpty(_cnonce) &&
        DateTime.Now.Subtract(_cnonceDate).TotalHours < 1.0)
    {
        request.Headers.Add("Authorization", GetDigestHeader(dir));
    }

    HttpWebResponse response;
    try
    {
        response = (HttpWebResponse)request.GetResponse();
    }
    catch (WebException ex)
    {
        // Try to fix a 401 exception by adding a Authorization header
        if (ex.Response == null || ((HttpWebResponse)ex.Response).StatusCode != HttpStatusCode.Unauthorized)
            throw;

        var wwwAuthenticateHeader = ex.Response.Headers["WWW-Authenticate"];
        _realm = GrabHeaderVar("realm", wwwAuthenticateHeader);
        _nonce = GrabHeaderVar("nonce", wwwAuthenticateHeader);
        _qop = GrabHeaderVar("qop", wwwAuthenticateHeader);

        _nc = 0;
        _cnonce = new Random().Next(123400, 9999999).ToString();
        _cnonceDate = DateTime.Now;

        var request2 = (HttpWebRequest)WebRequest.Create(uri);
        request2.Headers.Add("Authorization", GetDigestHeader(dir));
        response = (HttpWebResponse)request2.GetResponse();
    }
    var reader = new StreamReader(response.GetResponseStream());
    return reader.ReadToEnd();
}

}

然后你可以称之为：

DigestAuthFixer digest = new DigestAuthFixer(domain, username, password);
string strReturn = digest.GrabResponse(dir);

如果 Url 是： http: //xyz.rss.com/folder/rss那么域： http: //xyz.rss.com（域部分） dir：/folder/rss（url 的其余部分）

您也可以将其作为流返回并使用 XmlDocument Load() 方法。

于 2015-06-18T11:20:42.530 回答