oauth & POSTing JSON

Reading section 9.1 of OAuth Core 1.0, I only see a reference to performing POST requests using conte开发者_运维技巧nt-type of application/x-www-form-urlencoded.

• How does one go about performing POST requests with JSON data in the request body?
• How does handle the signing? Is it at all possible?
• Can this work on AppEngine?

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I have urlencoded the JSON, then unencoded on the other end in the past. I don't really know anything about AppEngine though, sorry.