com.twitter.finagle.http.SpnegoAuthenticator
If the request contained a valid spnego negotiation, return it.
If the request contained a valid spnego negotiation, return it.
Add a WWW-Authenticate: Negotiate <token> header to the response.
Add a WWW-Authenticate: Negotiate <token> header to the response.
Return a spnego 'challenge'
Return a spnego 'challenge'