CAMP defined JSON objects do not contain duplicate keys. Consumers and Providers SHALL NOT transmit JSON objects that contain duplicate keys. [PR-02] If a Consumer sends a Provider a request containing duplicate keys in a JSON object, the Provider SHOULD reject the request by sending back a '400 Bad Request' status code. [PR-03] If a Provider sends a Consumer a response containing duplicate keys in a JSON object, the Consumer SHOULD raise an error to the user indicating the response from the server was malformed. [PR-04] Note: Duplicate keys in JSON objects are allowed by [RFC4627] . This specification prohibits duplicate keys for interoperability reasons.