Add server responsibility to reject unsupported, extended requests. #1461
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Thanks to an astute comment by @freddrake in #1436 (direct link), @dgeb and I realized that the recent addition of extension negotiation to the 1.1 spec (#1457) was lacking a detail to aid client-server content negotiation. Namely, that the server must respond with a client error status code if the client sends an extended media type parameter with an unsupported extension. This PR adds the needed normative statement: