oauth-wg/oauth-identity-chaining

Correct/Update Authorization Server Discovery

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Feedback from Brian Campbell

There are a few places that mention using the WWW-Authenticate header a la RFC6750 to figure out the AS. But RFC6750 doesn't provide any AS info so that doesn't work. There's something along those lines being proposed in [https://datatracker.ietf.org/doc/draft-jones-oauth-resource-metadata/] that could get to AS info from RS info returned as a param of the WWW-Authenticate header but it's still just an individual draft currently.