Re: [OAUTH-WG] PAR error for redirect URI?

Making it a specific error code rather than just an error message suggests that the client can do something with that information. That doesn’t seem likely to me. It’s most likely caused by a misconfiguration that somebody needs to manually sort out rather than something that can be automatically corrected, so I don’t see a reason for this to get its own error code. 

— Neil

> On 2 Dec 2020, at 23:28, Brian Campbell <bcampbell=40pingidentity.com@dmarc.ietf.org> wrote:
> 
> 
> During the course of a recent OIDF FAPI WG discussion (the FAPI profiles use PAR for authz requests) on this issue it was noted that there's no specific error code for problems with the redirect_uri (the example in https://www.ietf.org/archive/id/draft-ietf-oauth-par-04.html#section-2.3 even shows a general error code with mention of the redirect_uri not being valid in the error description). Some folks on that call thought it would be worthwhile to have a more specific error code for an invalid redirect_uri and I reluctantly took an action item to raise the issue here. At the time I'd forgotten that PAR had already passed WGLC. But it's been sitting idle while awaiting the shepherd writeup since mid September so it's maybe realistic to think the window for a small change is still open.
> 
> Presumably nothing like an "invalid_redirect_uri" error code was defined in RFC 6749 because that class of errors could not be returned to the client via redirection. But the data flow in PAR would allow for a "invalid_redirect_uri" so it's not an unreasonable thing to do. 
> 
> As I write this message, however, I'm not personally convinced that it's worth making a change to PAR at this point. But I did say I'd bring the question up in the WG list and I'm just trying to be true to my word. So here it is. Please weigh in, if you have opinions on the matter. 
> 
> 
> 
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