Public parameters - API Reference| Alibaba Cloud Documentation Center

Public request parameters

Public request parameters are the request parameters used in each API.

Parameter	Type	Required	Description
Format	String	No	Type of value returned. JSON and XML are supported. The default type is XML.
Version	String	Yes	API version number, in the `YYYY-MM-DD` format. The current version number is `2017-12-18`.
AccessKeyId	String	Yes	Your Key ID issued by Alibaba Cloud for access to the service.
Signature	String	Yes	Signature result string. For more information about the signature calculation method, see Signature mechanism.
SignatureMethod	String	Yes	Signature method. HMAC-SHA1 is currently supported.
Timestamp	String	Yes	Time stamp of a request. The date format follows the ISO 8601 standard and uses UTC time. The format is `YYYY-MM-DDThh:mm:ssZ`. For example: `2015-01-09T12:00:00Z` (12:00:00 on January 9, 2015 UTC).
SignatureVersion	String	Yes	Signature algorithm version. The current version is 1.0.
SignatureNonce	String	Yes	Unique random number, used to prevent replay attacks. Different random numbers must be used for different requests.

Example

https://domain-intl.aliyuncs.com/
?Format=xml
&Version=2017-12-18    
&Signature=Pc5WB8gokVn0xfeu%2FZV%2BiNM1dgI%3D     
&SignatureMethod=HMAC-SHA1    
&SignatureNonce=15215528852396   
&SignatureVersion=1.0   
&AccessKeyId=key-test   
&Timestamp=2017-12-25T12:00:00Z   
…

Public response parameters

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

Examples

XML format

<?xml version="1.0" encoding="UTF-8"?> 
<!—Result root node-->
<API name+Response>
    <!—Returned request tag-->
    <RequestId>4C467B38-3910-447D-87BC-AC049166F216</    RequestId>
    <!—Returned results-->
</API name+Response>

JSON format

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