It was proposed as part of the device or username and password flow IIRC. 
Google has something like that when captcha breaks.

EHL

> -----Original Message-----
> From: David Recordon [mailto:[email protected]]
> Sent: Tuesday, June 22, 2010 1:47 PM
> To: Eran Hammer-Lahav
> Cc: Marius Scurtescu; OAuth WG ([email protected])
> Subject: Re: [OAUTH-WG] Last call for feedback on -08
> 
> If we have both error_code and error_description, why is an error_uri
> needed? (I'm not finding anything when I search the list for
> 'error_uri'.)
> 
> 
> On Tue, Jun 22, 2010 at 1:05 PM, Eran Hammer-Lahav
> <[email protected]> wrote:
> > There was also a suggestion by Brian to add an error_uri for additional
> information.
> >
> > I'm happy to include all three.
> >
> > EHL
> >
> >> -----Original Message-----
> >> From: Marius Scurtescu [mailto:[email protected]]
> >> Sent: Tuesday, June 22, 2010 1:00 PM
> >> To: Eran Hammer-Lahav
> >> Cc: OAuth WG ([email protected])
> >> Subject: Re: [OAUTH-WG] Last call for feedback on -08
> >>
> >> There was a suggestion to expand the 'error' parameter to two
> >> different
> >> parameters:
> >> - error_code - well defined list of error codes
> >> - error_description - authz server specific free form error
> >> description (for logging and troubleshooting)
> >>
> >> Not sure if you considered this.
> >>
> >> Marius
> >>
> >>
> >>
> >> On Mon, Jun 21, 2010 at 7:27 PM, Eran Hammer-Lahav
> >> <[email protected]> wrote:
> >> > I am working on -09 which I hope will be the last major revision of
> >> > the specification. If you were planning on submitting any feedback
> >> > on draft -08 or the simplification proposal from David and me,
> >> > please do so by tomorrow to be included in the next draft.
> >> >
> >> >
> >> >
> >> > EHL
> >> >
> >> > _______________________________________________
> >> > OAuth mailing list
> >> > [email protected]
> >> > https://www.ietf.org/mailman/listinfo/oauth
> >> >
> >> >
> > _______________________________________________
> > OAuth mailing list
> > [email protected]
> > https://www.ietf.org/mailman/listinfo/oauth
> >
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