Why Doesn't My HttpClient Pass Credentials to My Windows Service?

Resolving HttpClient Credential Problems

When using HttpClient to access a Windows service requiring authentication, the credentials might not be passed correctly. This often occurs with ASP.NET MVC Web API and IIS impersonation.

The difference in how HttpClient and WebClient handle credentials is key. HttpClient's UseDefaultCredentials property aims to handle credential retrieval, but it can be unreliable.

For guaranteed credential transmission, explicitly set UseDefaultCredentials to true within your HttpClientHandler:

var httpClient = new HttpClient(new HttpClientHandler() { UseDefaultCredentials = true });

This tells HttpClient to use the operating system's default credentials. This mirrors WebClient's behavior, ensuring the user initiating the web application request is properly authenticated by the Windows service.

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