On May 6, 2009, at 11:49 AM, Brian Eaton wrote:

[...]

> However, existing clients have hardcoded callback URLs on their
> approval URLs.  If the consumer code can detect that the service
> provider supports OAuth 1.0a, it can automatically correct that
> problem by stripping the callback URL off the approval URL.  If the
> consumer code can't detect service provider version, then we're going
> to end up in situations where different callback URLs are sent on both
> the request token step and the approval step.

Wouldn't the consumer detect that the SP supports the new flow by  
seeing that there is the callback_accepted parameter on the initial SP  
response? If not, it can repeat the request with the old flow.

- johnk

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