Vendor MIME types (for API versioning)

As I have decided to follow the standard, I decided to do just what your example shows.

Regarding your questions:

  1. Your MIME type should be registered
  2. I believe that each version and type should be registered, as they are unique types
  3. x- prefix has been deprecated as noted in a comment
  4. application/json-v2 would not be valid
  5. You could return 415 Unsupported Media Type or simply 400 Bad Request

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