THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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- If no conflict, the response code is 201(CREATED), the response body is emptythe added items.
- If conflict occurs:
- If allowMerge is false, the response code is 409(CONFLICT), and returns error.
- if allowMerge is true, the response code is 202(ACCEPTED), the response body is the merged result.
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