Extensibility in authentication schemes is a bad thing, given how they are 
deployed and the difficulty of changing them. No existing authentication scheme 
is extensible (explicitly).

EHL

> -----Original Message-----
> From: oauth-boun...@ietf.org [mailto:oauth-boun...@ietf.org] On Behalf
> Of Marius Scurtescu
> Sent: Friday, June 10, 2011 10:39 AM
> To: John Kemp
> Cc: paul Tarjan; OAuth WG
> Subject: Re: [OAUTH-WG] consistency of token param name in bearer token
> type
> 
> On Fri, Jun 10, 2011 at 9:34 AM, John Kemp <j...@jkemp.net> wrote:
> > George,
> >
> > On Jun 10, 2011, at 4:11 PM, George Fletcher wrote:
> >
> >> I definitely don't want to change the Authorization header naming
> scheme. I believe it should stay 'Bearer' because that's what the token is. We
> could make it...
> >>
> >> Authorization: Bearer access_token=vF9dft4qmT
> >>
> >> If that helps with consistency.
> >
> > Well, it might seem more consistent, but I'm not sure it's worthwhile to
> make the change just for that reason.
> >
> > Is it possible that the Bearer HTTP mechanism would ever take multiple
> parameters? In which case, having the ability to name the parameters of the
> Bearer mechanism might become more interesting.
> 
> Hard to say, but using a proper name/value pair has several advantages:
> - permits extensibility
> - no need to limit or define character set of access tokens (name is either
> "token" or "quoted string")
> - HTTP header parsers can properly deal with name/value pairs
> 
> If we make changes to the GET/POST parameter name then I think we
> should also consider the header as well.
> 
> Marius
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