[OpenID] Content-Type for Key-Value Form response from OP

[Martin Atkins]

Andrew Arnott wrote:
> In that case, I move that we adopt text/kvf as the official Content-Type 
> for Key-Value Form encoding response messages.
> 

Hi Andrew,

Sorry I didn't see your messages until now.

I believe the convention for unregistered MIME types is to prefix the 
subtype part with "x-", giving something like text/x-kvf.

However, since the spec mandates UTF-8 for this message format, it may 
be more appropriate to use an "application/" type; text types generally 
support a "charset" attribute allowing the content to be in an arbitrary 
character encoding, which is not appropriate here.