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: JSON. Valid values:
  • JSON
  • XML
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 indicates 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=LTAI4GENiH2u8MVj7Khh****
&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*/
}