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

[Andrew Arnott]

I'm looking for a suggested Content-Type to use when sending OP direct
messages (Key-Value Form).  The default web servers are sending (at least
mine) is text/html.  But not only is text/html inaccurate (as is text/plain,
to a lesser degree), but some free hosts (like GoDaddy's free hosting) will
tack on an advertising <script> tag at the end of any message leaving the
server if it is text/html or text/plain, which invalidates the Key-Value
Encoding.

I have tested application/openidkvf and that allows an OP to be hosted on
GoDaddy free hosting sites without having its direct message responses
corrupted by the <script> tag.  But I see a few issues with this
content-type:

   1. Some firewalls may block it as an unknown content-type (I've already
   heard reports of firewalls blocking application/xrds+xml).
   2. It doesn't look that nice.
   3. Other OpenID Providers may be using something different, and it would
   be nice to standardize.

Is there any content-type that others are using for this, or that you might
recommend?

Thanks.

-- 
Andrew Arnott
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