Any way to force authescheme in URL?

Hello All,

I have a couple of SICF nodes configured for SAML but want to be able to use some test accounts, not registered in our token service domain, to test back end. Ideally I'd have the testers use the same node and just force Basic auth. Do I recall something like &auth-schema=basic in a URL where I could force this. It would bypass of take priority over existing logon config and allow testers to log on using basic auth? Have been searching but am finding nothing.

Thanks,

Doug