Common request parameters are the request parameters that every API operation must use.

Common request parameters

Table 1. Common request parameters
Parameter Type Required Description
Format String Yes The format of the data to return. Valid values: JSON and XML. Default value: XML.
Version String Yes The version number of the API. Specify the version number in the YYYY-MM-DD format. The current version is 2015-01-01.
AccessKeyId String Yes The AccessKey ID that Alibaba Cloud provides for you to access services.
Signature String Yes The signature string. For more information about the signature calculation method, see Digital signature.
SignatureMethod String Yes The signature method. Currently, HMAC-SHA1 is supported.
Timestamp String Yes

The timestamp at which you send the request. Specify the time in the ISO 8601 standard in the yyyy-MM-ddTHH:mm:ssZ format. The time must be in UTC. For example, you can set the parameter to 2016-01-01T12:00:00Z, which indicates 20:00:00, January 1, 2016, China Standard Time.

SignatureVersion String Yes The version of the signature algorithm. The current version is 1.0.
SignatureNonce String Yes The unique random number that is used to prevent replay attacks. You must use a different random number for each request.

? Format=json

Common response parameters

When you call an operation, the system returns the globally unique identifier (GUID) of the request through the RequestId parameter, regardless of whether the request is successful.


<? xml version="1.0" encoding="utf-8"? > 
<!--The root node of the response-->
<API operation name + Response>
<!--The returned request tag-->
<!--The returned result-->
</API operation name + Response>