The old AOL Blogs API, which used AOL's OpenAuth service, provided a url=
parameter on WWW-Authenticate: challenges:

dev.estage.aol.com/aolblogs_api#mozTocId815750

<http://webcache.googleusercontent.com/search?q=cache:VD8dYmqAaREJ:dev.estage.aol.com/aolblogs_api+AOL+OpenAuth+401+response+WWW-Authenticate&cd=9&hl=en&ct=clnk&gl=us>

   -  If authorization fails, a 401 response is returned with a
   WWW-Authenticate: header providing additional details.

WWW-Authenticate: OpenAuth realm="AOLBlogs", status="status", msg="message",
url="url"

This is from 2007 ;).

On Tue, Apr 27, 2010 at 11:49 AM, Torsten Lodderstedt <
tors...@lodderstedt.net> wrote:

> Am 24.04.2010 02:05, schrieb Brian Eaton:
>
>  On Thu, Apr 22, 2010 at 6:11 PM, Manger, James H
>> <james.h.man...@team.telstra.com>  wrote:
>>
>>
>>> We mustn't drop advertisements (details in 401 responses).
>>> We mustn't drop the goal of a standard for interoperability.
>>>
>>>
>> I share the goals, I just don't think that a specification is the way
>> to get there.  I think working examples in the wild would help
>> enormously.
>>
>>
>>
>>> Defining a scope field in a 401 response is the novel aspect that “might
>>> not actually work”. Allowing a 'scope' query parameter in authz URIs is be
>>> quite separate.
>>>
>>>
>> Yeah, I agree with that analysis.
>>
>> Though I don't know of any providers that are returning authorization
>> URLs in 401 responses right now.  That's novel, too.
>>
>>
>>
>
> That's novel, yes. But I think no one did it before because there was no
> need to do so. BASIC and DIGEST don't require authorization endpoint
> coordinates. SPNEGO/Kerberos would be a candidate because of its
> architecture, but it uses the standard Kerberos mechanisms (config or
> DNS-based discovery via SRV records).
>
> I think there is a need for a standardized way of authorization server
> discovery. Using the WWW-Authentication header is better than nothing from
> my point of view.
>
> Alternatively, resource servers could publish their supported
> authentication servers via XRD or a similar mechanism. The authorization
> server in turn could publish its endpoints (and capabilities) the same way.
>
> regards,
> Torsten.
>
>
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