On 2021-02-25 3:41 a.m., Seán Kelleher wrote:

    Yep, this is the big point - OAuth is designed to require the the
    third leg of trust that creates the NxM problem.


I believe the snippet of Justin's that you quoted actually shows you how you can forgo the trust element using dynamic client registration. It still allows a "server" to identify requests and impose security policies via the client ID, but without requiring the client author to manually register the client in advance of using it (e.g. in the case where the client author doesn't even know what servers the client is going to be connecting to). You still need the client ID, but anyone can get one whenever they need it.

Apologies if this a dumb question, but how would you discover the dynamic client registration endpoint after getting a 401 unauthorized?

I couldn't really find anything in RFC7591 about this.

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