Cannot pass digest authentication

I am implementing digest authentication. I copied example of
authenticate_or_request_with_http_digest and tried different approaches
but I couldn’t pass the authentication. I always get 401 Unauthorized.

My code exactly from example.

Debugger shows that browser generated response and expected results do
not match although all fields look OK.

Please help. It’s urgent.
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[2010-07-13 23:48:48] INFO WEBrick 1.3.1
[2010-07-13 23:48:48] INFO ruby 1.8.6 (2008-08-11) [i386-mswin32]