C# System.Net.WebClient 奇怪地失败
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System.Net.WebClient fails weirdly
提问by Erling Paulsen
I am trying to download some data from the reporting services instance on our TFS server.
Given that the code should run on a computer that is not domain-joined, I figured that I would set the credentials myself. No luck, got a HTTP 401 Unauthorized back. Ok, so I hooked up Fiddler to see what was happening.
我正在尝试从我们的 TFS 服务器上的报告服务实例下载一些数据。
鉴于代码应该在未加入域的计算机上运行，我想我会自己设置凭据。不走运，得到了 HTTP 401 Unauthorized 回复。好的，所以我连接了 Fiddler 看看发生了什么。
But that's when I got Heisenberged- the call now went through without a hitch. So the authentication goes through with Fiddler connected, but fails without it. Is the Webclient broken or am I missing something profound here?
但那是我得到海森堡的时候——电话现在顺利通过了。因此，身份验证在 Fiddler 连接的情况下通过，但没有它就会失败。是 Web 客户端坏了还是我在这里遗漏了一些深刻的东西？
private void ThisWorksWhenDomainJoined()
{
WebClient wc = new WebClient();
wc.Credentials = CredentialCache.DefaultNetworkCredentials;
wc.DownloadString("http://teamfoundationserver/reports/........"); //Works
}
private void ThisDoesntWork()
{
WebClient wc = new WebClient();
wc.Credentials = new NetworkCredential("username", "password", "domain");
wc.DownloadString("http://teamfoundationserver/reports/........"); //blows up wih HTTP 401
}
采纳答案by Robert Vukovi?
Take a look at this link:
HTTP Authorization and .NET WebRequest, WebClient Classes
看看这个链接：
HTTP Authorization and .NET WebRequest, WebClient Classes
I had the same problem as you. I have only added one line and it started to work. Try this
我和你有同样的问题。我只添加了一行，它就开始工作了。尝试这个
private void ThisDoesntWork()
{
WebClient wc = new WebClient();
wc.Credentials = new NetworkCredential("username", "password", "domain");
//After adding the headers it started to work !
wc.Headers.Add(HttpRequestHeader.UserAgent, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)");
wc.DownloadString("http://teamfoundationserver/reports/........"); //blows up wih HTTP 401
}
回答by travis
What happens when you use this?
当你使用它时会发生什么？
wc.Credentials = CredentialCache.DefaultCredentials;
Also, are you sure you have the correct username, password and domain?
另外，您确定您拥有正确的用户名、密码和域吗？
Also: I wonder if Fiddler is changing around some unicode characters when .net breaks them or something like that. If your user/pass/domain has unicode, try escaping it out like "\u2638"instead of "?".
另外：我想知道当 .net 破坏它们或类似的东西时，Fiddler 是否正在改变一些 unicode 字符。如果您的用户/密码/域具有 unicode，请尝试将其转义，"\u2638"而不是"?".
回答by JP Alioto
Try this ...
尝试这个 ...
var credCache = new CredentialCache();
credCache.Add(new Uri("http://teamfoundationserver/reports/........""),
"Basic",
new NetworkCredential("username", "password", "DOMAIN"));
wc.Credentials = credCache;
If that does not work, try replacing "Basic" with "Negotiate".
如果这不起作用，请尝试将“基本”替换为“协商”。
回答by Guy Starbuck
I was able to get around this error by using a CredentialCache object, as follows:
我能够通过使用 CredentialCache 对象来解决这个错误，如下所示：
WebClient wc = new WebClient();
CredentialCache credCache = new CredentialCache();
credCache.Add(new Uri("http://mydomain.com/"), "Basic",
new NetworkCredential("username", "password"));
wc.Credentials = credCache;
wc.DownloadString(queryString));
