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Why not use a custom type instead of the 'Content-Type' header?

Edit: Looks like this may not be possible on a HTML 5 form.

Maybe posting should be done with a richer client-side app than a vanilla form. The unaided browser is a pretty sad user agent.

The thing is, this isn't all that important...

A down vote isn't a substitute for a valid reason why supporting vanilla forms is an important point in the API versioning discussion ;)