This topic describes the common parameters, including the common request parameters and common response parameters.

Common request parameters

Parameter Type Required Description
Action String Yes The operation that you want to perform.
Format String No The format to return the response values in. Valid values: JSON and XML. Default value: XML.
Version String Yes The version number of the API. Specify the version in the YYYY-MM-DD format. Set this parameter to 2015-04-01.
Signature String Yes The signature string of the current request.
SignatureMethod String Yes The encryption method of the signature string. Set this parameter 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 this parameter 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.

Common response parameters

Parameter Type Description
RequestId String The ID of the request. The system returns a unique request ID for each API request. This request ID is used to identify each API request.

Sample requests
? Format=xml

Sample responses

  • XML format
    <? xml version="1.0" encoding="utf-8"? >
    <!—Response root node-->
    <API operation name+response>
      <!—Request ID-->
      <!—Result data-->
    </API operation name+response>
  • JSON format
      "RequestId": "4C467B38-3910-447D-87BC-AC049166F216"
      /* Result data */