Public request parameters are request parameter that each interface uses.

Public parameters

Table 1. Public request parameters
Name Type Required Description
Format String Yes Type of the returned value. Values: JSON and XML. Default value: XML.
Version String Yes API version number: Format: YYYY-MM-DD (date). The current version number is 2016-11-01.
AccessKeyId String Yes. Key ID that Alibaba Cloud issues to a user for service access.
Signature String Yes Signature result string. For more information about the signature calculation method, see Signature method.
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 UTC time. Format: YYYY-MM-DDThh:mm:ssZ, for example, 2013-08-15T12:00:00Z (20:00:00, August 15, 2013, Beijing time).

SignatureVersion String Yes The version of the signature algorithm. The current version is 1.0.
SignatureNonce String Yes Unique random number, used to prevent replay attacks. The user must use different random numbers for different requests.



Public return parameters

Each time the user sends a call request to an interface, the system returns a unique identification code (RequestId) to the user, whether the request is successful or not.


<? xml version="1.0" encoding="utf-8"? > 
                <!—Result Root Node-->
                <Interface Name+Response>
                <!—Return Request Tag-->
                <!—Return Result Data-->
                </Interface Name+Response>