Marius

> ...not sure if this is a problem in real life.
> The resource that the client is trying to access should not redirect
> to an untrusted resource which is not supposed to receive access tokens.


This is a massive restriction on what a web service can do.
It breaks the web if a service cannot redirect to less trusted sites.


An service couldn't redirect to a content distribution network (CDN) -- even if 
using unguessable URIs (ie capabilities) -- without exposing tokens to the CDN.
After accepting a secure, authenticated POST a service couldn't return a 303 
pointing at an standard (public) response on HTTP -- or the token would be 
exposed in the clear.
Google couldn't offer its "I'm feeling lucky" interface to apps.


--
James Manger
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