Public clients can use the token-based auth mechanism, can’t they? If you don’t 
have some form of authentication on the introspection endpoint, you end up with 
a way for people to anonymously and programmatically fish for valid token 
values. 

 — Justin

> On Jul 19, 2015, at 6:30 AM, Aaron Parecki <aa...@parecki.com> wrote:
> 
> The introspection draft states that the introspection endpoint MUST require 
> authentication of clients. It mentions either client authentication 
> (id+secret) or a separate bearer token.
> 
> How are public clients expected to use the token introspection endpoint? I 
> didn't see a note in the document about that at all.
> 
> ----
> Aaron Parecki
> aaronparecki.com <http://aaronparecki.com/>
> @aaronpk <http://twitter.com/aaronpk>
> 
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