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What results are returned after Alibaba Cloud calls the API service?

After calling the API service, the returned data adopts a unified format. The returned HTTP status code is 2xx, which means the call is successful; the returned HTTP status code 4xx or 5xx means the call failed. There are two main data formats returned by a successful call: XML and JSON. The external system can pass in parameters during the request to specify the returned data format. The default is XML format.