http://127.0.0.1:8000/security/resources/basic-auth.php?username=webkit&password=rocks - didReceiveAuthenticationChallenge - Responding with webkit:rocks
This test makes sure that auth credentials cached during a private browsing session do not leak out after private browsing is disabled.   

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Frame: '<!--framePath //<!--frame0-->-->'
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Authenticated as user: webkit password: rocks

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Frame: '<!--framePath //<!--frame1-->-->'
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Resource loaded with HTTP authentication username '' and password ''