This topic describes the request and response parameters that all operations use.

Common request parameters

Parameter Type Required Description
Format String No The format in which to return the response. Valid values:

JSON and XML. Default value: JSON.
Version String Yes The version number of the API. The value is in the YYYY-MM-DD format.

Set the value to 2019-12-12.

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.

Example: 2013-01-10T12:00:00Z, which indicates 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 used to prevent replay attacks.

You must use different numbers for different requests.
ResourceOwnerAccount String No The owner account (the logon username) of the resource that you want to access by using this API request.
Sample requests 
https://amqp-open.aliyuncs.com/?Action=ListInstances
&Format=JSON
&Version=2019-12-12
&Signature=xxxx%xxxx%3D
&SignatureMethod=HMAC-SHA1
&SignatureNonce=e7b1f31150be45594905ce6d28561286
&SignatureVersion=1.0
&AccessKeyId=key-test
&TimeStamp=2020-02-10T08%3A43%3A05Z
…

Common response parameters

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 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-->
    <Interface Name+Response>
        <!--Return Request Tag-->
        <RequestId>D6660A81-1A96-43F3-AC00-4EE473C70AEC</RequestId>
        <!--Return Result Data-->
    </Interface Name+Response>
  • JSON format 
    {
    "RequestId":"D6660A81-1A96-43F3-AC00-4EE473C70AEC",
    /*Return Result Data*/
}