Why Isn't My HttpClient Passing Credentials, and How Can I Fix It?

Debugging HttpClient Credential Issues

Your HttpClient isn't sending authentication details with requests, leading to authentication failures at the server. While WebClient works as expected, HttpClient is failing. Let's identify the root cause and fix it.

You've already set UseDefaultCredentials to true. However, this isn't always sufficient. The system needs the correct credentials.

Here's how to resolve this:

1. Verify Web Application Impersonation: Double-check your web application's impersonation settings are correctly configured.
2. Service Account Permissions: Confirm the Windows service account has the necessary permissions to access the web application.
3. Explicitly Set Credentials: Use HttpClientHandler to explicitly define credentials using CredentialCache.DefaultCredentials:

<code class="language-csharp">var myClient = new HttpClient(new HttpClientHandler()
{
    UseDefaultCredentials = true,
    Credentials = CredentialCache.DefaultCredentials
});</code>

This forces HttpClient to utilize the default system credentials, mirroring WebClient's behavior. This ensures proper user impersonation during requests to the web application.

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