Using Default Credentials in System.Net.HttpClient request in UWP

问题

We are porting our Windows 8.1 app to UWP and are experiencing an issue with sending default user credentials for single sign-on. It seems that credentials are not being set, despite setting UseDefaultCredentials = true on the handler. This exact code was working in Windows 8.1.

using (var client = new HttpClient(new HttpClientHandler() { UseDefaultCredentials = true }))
{
    // client._handle.Credentials is null
    // This call fails authentication with a 401 
    // and Fiddler shows no attempt to pass authentication
    var response = await client.GetStringAsync(new Uri(GlobalConfig.Config.BaseUri, "Presenter/SingleSignOn"));
    ...
}

As noted above, in debugging I can see that client._handle.Credentials is null.

I have also tried setting credentials from the System.Net.CredentialCache, but these appear to return empty credentials and they also result in a null client._handle.Credentials.

var handler = new HttpClientHandler() { Credentials = System.Net.CredentialCache.DefaultCredentials };
var handler = new HttpClientHandler() { Credentials = System.Net.CredentialCache.DefaultNetworkCredentials };

I have double-checked our declared Capabilities as per this answer and they look fine. We have declared capabilities:

Enterprise Authentication
Internet (client)
Private Networks (Client & Server)
Removable Storage

I have tried using Windows.Web.HttpClient, but it has the same issue--it doesn't find default credentials, so it prompts via a UI. Am I missing something obvious? Or something non-obvious?

TL;DR - I am having trouble passing default user credentials in HttpClient requests.

Edit: I should add that authentication in general is working. If I pass a username/password explicitly, then it works. Obviously, that's not the goal here.

来源：https://stackoverflow.com/questions/44396390/using-default-credentials-in-system-net-httpclient-request-in-uwp

标签

.net

uwp

system.net