This topic describes common parameters, which include common request parameters and common response parameters. Common parameters are required by all API operations.

Common request parameters

Table 1. Common request parameters
Parameter Type Required Description
Format String No The response format. Valid values:
  • JSON (default)
  • XML
Version String Yes The version number of the API. Specify the version number in the YYYY-MM-DD format.

Set the value to 2019-12-09.

AccessKeyId String Yes The AccessKey ID provided to you by Alibaba Cloud.
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.

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, use 2013-01-10T12:00:00Z to indicate 20:00:00 on January 10, 2013 (UTC+8).

SignatureVersion String Yes The version of the signature encryption algorithm.

Set the value to 1.0.

SignatureNonce String Yes A unique, random number that is used to prevent replay attacks.

You must use different random numbers for different requests.

ResourceOwnerAccount String No The Alibaba Cloud account to which the resource you want to access belongs.
Sample requests 
http://bastionhost.aliyuncs.com/?Action=TagResources
&TimeStamp=2014-05-19T10%3A33%3A56Z
&Format=xml
&AccessKeyId=testid
&SignatureMethod=Hmac-SHA1
&SignatureNonce=NwDAxvLU6tFE0DVb
&Version=2014-05-15
&SignatureVersion=1.0
&Signature=Signature

Common response parameters

API responses use the HTTP response format. Responses can be returned in either 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 regardless of whether the call is successful.
  • A 2xx status code indicates a successful call.
  • A 4xx or 5xx status code indicates a failed call.
Sample responses
  • XML format 
    <?xml version="1.0" encoding="utf-8"?>
     <!--Result Root Node-->
    <Interface Name+Response>
        <!--Return Request Tag-->
        <RequestId>4C467B38-3910-447D-87BC-AC049166F216</RequestId>
        <!--Return Result Data-->
    <Interface Name+Response>
  • JSON format 
    {
    "RequestId":"4C467B38-3910-447D-87BC-AC049166F216",
    /*Return Result Data*/
    }