Profiles for configuring a web profile SP with multiple IdPs?

[Will Hartung <willh@mirthcorp.com>]

Is there a profile discussing how an SP determines which IdP to
authenticate with for a particular request? Are there any common
practices?

I was considering leveraging a referrer header of the initial request
to help make the determination.

Just curious what the prior art is before I go off on my own.

Regards,

Will Hartung
(willh@mirthcorp.com)

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