> 
> - give out authorization codes via the user-agent flow.  We've
> implemented a variation of this based on HTML5 and window.postMessage.
> 
Caveat: This will run you off-spec.

> - use a fixed callback URL for the user-agent flow.  Make sure that
> fixed callback URL does not run random bits of script.  Then have that
> fixed callback URL use javascript to convey the token to other pages
> on the same origin.
>
> It's a bad idea to use the user-agent flow without a specific
> whitelist of callback URLs which can receive the token.

Brian's nailed it here. The best way to use this flow is to control the
landing page as much as possible.

 -- Justin


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