Question

C#使用HttpWebRequest请求url出现远程服务器返回一个错误：401未经授权

需要将本系统页面去请求一个URL看是否能返回一些信息来判断已有另一个系统的登录信息，实际上就是实现单点登录，但是后台调试出现401错误，这个url用浏览器是可以访问的，不知道是什么问题，请高手帮忙~~代码如下~
HttpWebRequest webrequest = (HttpWebRequest)HttpWebRequest.Create("http://portal.boe.com.cn/boe-SSOAuthen/index.jsp?ltpatoken=LQyfa6TV9rJWZ+uHtLyUL1IBVwDCuv7wmO72FRuxGpoI1m9Px7w2oyOJlpbHm7pB0hq4SscXnTcNMIXciyBjNJF+zboqe+9Jxdwer9zz2R8g67vrLJjoUNZ38pPkD72cQ0vCwjJol30zhW2ajZBj+vf+Rsj9h5uMYmIxEeq5t0De4m3WUdLrDhnn8Aky4it2zDyistaOexfP2nkDPEJmgjpGdtN/Qh2gLDRf74/RZHBSrTXr/W4MCfS4F6SkXKkYifoxQngeC2fMoemXFA89QaDTdbzElbjH1AHJRpTfMTH3XyBAQOVX7cuXPz6U7/B2HymtNa2acYa5VpZLXaUmTb2Eoa787967");
webrequest.Credentials = CredentialCache.DefaultCredentials;

HttpWebResponse webreponse = (HttpWebResponse)webrequest.GetResponse();
Stream stream = webreponse.GetResponseStream();
byte[] rsByte = new Byte[webreponse.ContentLength]; //save data in the stream
try
{
stream.Read(rsByte, 0, (int)webreponse.ContentLength);
return System.Text.Encoding.UTF8.GetString(rsByte, 0, rsByte.Length).ToString();
}
catch (Exception exp)
{
return exp.ToString();
}

Answer 1

需要一个STATIC的全局授权回调函数

Answer 2

/*
* Created by SharpDevelop.
* User: Austin
* Date: 2015/10/16
* Time: 10:52
*
* To change this template use Tools | Options | Coding | Edit Standard Headers.
*/
using System;
using System.IO;
using System.Net;
using System.Text;

namespace nezha_api_test
{
public class Hello
{
private static string username = "***********";

private static string password = "**************";

public static void Main(string[] args)
{

try {
string url = "**************";

HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;

request.Credentials = GetCredentialCache(url, username, password);

request.Headers.Add("Authorization", GetAuthorization(username, password));

request.Method = "GET";

HttpWebResponse myResponse = request.GetResponse() as HttpWebResponse;

StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);

string s = reader.ReadToEnd();

reader.Close();

myResponse.Close();

Console.WriteLine(s);

Console.Read();

} catch (WebException e) {
StreamReader reader = new StreamReader(e.Response.GetResponseStream(), Encoding.UTF8);

string s = reader.ReadToEnd();

Console.WriteLine(s);

Console.Read();
}

}

#region # 生成 Http Basic 访问凭证 #

private static CredentialCache GetCredentialCache(string uri, string username, string password)
{
string authorization = string.Format("{0}:{1}", username, password);

CredentialCache credCache = new CredentialCache();
credCache.Add(new Uri(uri), "Basic", new NetworkCredential(username, password));

return credCache;
}

private static string GetAuthorization(string username, string password)
{
string authorization = string.Format("{0}:{1}", username, password);

return "Basic " + Convert.ToBase64String(new ASCIIEncoding().GetBytes(authorization));
}

#endregion
}
}

Answer 3

要先登录，保持COOKIE再访问你上面的地址。

追问

我试过先登录需验证的系统，然后再打开当前页面，但是还是不行提示401错误

追答

COOKIE容器，要使用。保持前面的验证后COOKIE，再访问