Why would you "chain" authenticators?
Well, i have chained SSL and BASIC authenticators.
I the users have some "well known" certificate installed (checked agains LDAP) they do not have to enter some user/password, else a BASIC authenticator (via https) is presented.
So it is possible to use the application from within the company or at home without login, if the user needs access to the application from some internet-cafe a login screen will be presented.
Ciao, Mario
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