Common request parameters

Common request parameters refer to the request parameters that each API requires.

Table 1. Common request parameters
Name Type Required Description
Format String No The format of the returned value. Values: JSON and XML. The default format is XML.
Version String Yes The version of the API, in the format of YYYY-MM-DD. The current version is 2016-05-03.
AccessKeyId String Yes The Key ID provided by Alibaba Cloud for you to access services.
Signature String Yes The result string of the signature. For more information about how to calculate a signature, see Sign signatures.
SignatureMethod String Yes The method of the signature. HMAC-SHA1 is supported currently.
Timestamp String Yes
The timestamp of the request. The format of the date follows the ISO8601 standard and uses UTC time. The format is as follows:

For example, 2013-08-15T12:00:00Z indicates 20:00:00, Jan 10, 2013, Beijing time.

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

? Format=xml 

Common response parameters

Each time you make a call to an API, the system returns a unique identification code (RequestId), regardless whether the request is successful.


<? xml version="1.0" encoding="utf-8"? >  
<!-Result root node--> 
<API name+Response> 
 <!-Return request tag--> 
 <!-Return result data--> 
</API name+Response>