Public request parameters

Public request parameters are the request parameters used by each API.
Parameters Type Required or not Description
Format String No Format of the return value, which can be JSON or XML (default).
Version String Yes API version, in the format of YYYY-MM-DD. The current version is 2014-06-18.
AccessKeyId String Yes Your Access Key ID issued by Alibaba Cloud.
Signature String Yes Signature result string. For more information about the signature calculation method, see Signature mechanism.
SignatureMethod String Yes Signature method. Currently, HMAC-SHA1 is supported.
Timestamp String Yes Timestamp of a request. The date format follows the ISO8601 standard and uses the UTC time. The format is YYYY-MM-DDThh:mm:ssZ.Example: 2014-7-29T12:00:00Z (July 29, 2014 at 20:00:00, Beijing time).
SignatureVersion String Yes Signature algorithm version. The current version is 1.0.
SignatureNonce String Yes Unique random number, used to prevent replay attacks. You must use different random numbers for different requests.
? Format=json 

Public return parameters

The system returns a unique identification code (RequestId) each time you send a request to call an API, no matter whether the call is successful or not.

XML example
<? xml version="1.0" encoding="UTF-8"? >
    <!--Result root node--> 
    <API name+Response><!--Returned request tag-->
        <!--Returned results--> 
    </API name+Response>
JSON example

"RequestId": "4C467B38-3910-447D-87BC-AC049166F216", /* Returned results */