I think all servers must support the header. I don't think we can demand all 
servers to support query or post parameters as that can conflict with their 
existing namespace or architecture. I suggest we:

1. Make the "Token" scheme required in all resource servers
2. Allow resource servers to support the URI query or response body
3. Specify that when a request comes without the header to a server only 
supporting the header, the server should respond with 
error=authentication_required to inform the client this form of authentication 
is not supported.

EHL

> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf
> Of Marius Scurtescu
> Sent: Thursday, July 01, 2010 12:48 PM
> To: Justin Richer
> Cc: [email protected]
> Subject: Re: [OAUTH-WG] Versioning
> 
> On Thu, Jul 1, 2010 at 12:38 PM, Justin Richer <[email protected]> wrote:
> >> > OAuth tokens as a form-encoded element in a post body? Yes. Keep it.
> >>
> >> Just curious. What use case would require that the access token is
> >> put in the post body as opposed to an http header when accessing a
> >> protected resource?
> >
> > If nothing else, it parallels the use case of a GET-style query
> > parameter. It makes sense to have it be valid in both ways to allow
> > developers to put the token in with whatever other parameters they're
> > passing along. I've got plenty of use cases here for the query
> > parameters: it's needed for cases where your client can't get any
> > deeper into HTTP than "hey go fetch me this URL".
> 
> You can still use query parameters with POST.
> 
> 
> > What use case says we shouldn't do POST parameters like that? A server
> > wanting to do early-dispatch of a request was brought up, but that was
> > only in the case of handling OAuth 1 and 2 simultaneously as I
> > understood it. If a server's going to be doing dispatch on auth
> > headers and query parameters already, it seems that it's got the
> > wherewithal to parse a form-encoded body, too.
> 
> Parsing the body is not trivial. Some filters do not have access to it (apache
> mod_redirect for example), some frameworks will allow you to access it once
> and then commit to a format, a decision that cannot be made by a filter (in
> Java see ServletRequest: getInputStream vs getReader vs getParameter).
> 
> 
> Marius
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