HTTP: Authenticate Using the Current Windows User

The HTTP component supports authentication using the currently logged-in Windows user's credentials, eliminating the need to set the User and Password properties; to enable this, set the AuthScheme property to NTLM or Negotiate and do not specify user credentials.

In C#:

http.AuthScheme = HttpAuthSchemes.authNegotiate;
http.Get("www.example.com")

In C++:

http.SetAuthScheme(5); // Negotiate;
http.Get("www.example.com");

Note This functionality is supported only on Windows systems.