Common parameters - - Alibaba Cloud Documentation Center

This topic describes the common request and response parameters.

Common request parameters

Parameter	Type	Required	Description
Format	String	No	The format in which to return the response. Default value: XML. Valid values: JSON XML (default)
Version	String	Yes	The version number of the API. Specify the version number in the YYYY-MM-DD format. Set the value to 2019-09-10.
Signature	String	Yes	The signature string of the current request.
SignatureMethod	String	Yes	The encryption method of the signature string. Set the value to HMAC-SHA1.
SignatureNonce	String	Yes	A unique, random number used to prevent replay attacks. You must use different numbers for different requests.
SignatureVersion	String	Yes	The version of the signature encryption algorithm. Set the value to 1.0.
AccessKeyId	String	Yes	The AccessKey ID provided to you by Alibaba Cloud.
Timestamp	String	Yes	The timestamp of 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, 2013-01-10T12:00:00Z specifies 20:00:00 on January 10, 2013 (UTC+8).

Sample requests

http(s)://ros.aliyuncs.com/?Action=CreateStack
&Format=xml
&Version=2019-09-10
&Signature=Pc5WB8gokVn0xfeu%2FZV%2BiNM1dg****
&SignatureMethod=HMAC-SHA1
&SignatureNonce=1521552885****
&SignatureVersion=1.0
&AccessKeyId=LTAI****************
&Timestamp=2020-06-01T12:00:00Z

Common response parameters

Responses can be returned in the JSON or XML format. You can specify the response format in the request. The default response format is JSON. Every response returns a unique RequestId value regardless of whether the call is successful.

A 2xx HTTP status code indicates a successful call.
A 4xx or 5xx HTTP status code indicates a failed call.

Sample responses

XML format

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

JSON format

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