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Common Parameters

Last Updated: Aug 21, 2019

Common request parameters

Common request parameters are the request parameters required by each operation.

Name Type Required Description
Action String Yes API name
Format String No The format of the response. Valid values: JSON and XML. Default value: XML.
Version String Yes The version number of the specified operation. Format: YYYY-MM-DD. The current version number is 2017-12-14.
AccessKeyId String Yes The AccessKeyID generated by Alibaba Cloud for accessing the service. You can use the AccessKeyID to query site information.
Signature String Yes The signature string.
SignatureMethod String Yes The signature method. Valid value: HMAC-SHA1.
Timestamp String Yes The timestamp of the specified request. The date format follows the ISO8601 standard and uses UTC time. Format:YYYY-MM-ddTHH:mm:ssZ. Example: 2016-05-23T12:00:00Z, which is China Standard Time 2016-05-23 20:00:00.
SignatureVersion String Yes The version of the specified signature algorithm. Valid value: 1.0.
SignatureNonce String Yes A unique random number that is used to prevent replay attacks. You must use different random numbers for different requests.



Common response parameters

The system returns the RequestId that is the GUID generated by Alibaba Cloud when you call an API operation, whether the call is successful or not.


  1. <? xml version="1.0" encoding="UTF-8"? >
  2. <!—Response root-->
  3. <Operation name+Response>
  4. <!—Response data-->
  5. <RequestId>4C467B38-3910-447D-87BC-AC049166F216</RequestId>
  6. </Operation name+Response>