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 
> <[email protected]> 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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