Common request parameters

The following table describes common request parameters used in most Alibaba Cloud APIs.

Table 1. Common request parameters
Parameter Type Required? Description
Format String No The format of the response. Valid values:

JSON (default) | XML

Version String Yes The version of the API. It uses the date format YYYY-MM-DD. Valid value:


AccessKeyId String Yes The AccessKey ID of the user who calls the API.
Signature String Yes The request signature.
SignatureMethod String Yes The algorithm used to create the request signature. Valid value:


Timestamp String Yes The time at which the request is signed. It uses the format: YYYY-MM-DDThh:mm:ssZ.

For example, 2013-01-10T12:00:00Z.

SignatureVersion String Yes The signature version to use. Valid value:


SignatureNonce String Yes A random number for the signature to prevent from network attacks.

Different random numbers must be used for different requests.

Common response parameters

Alibaba Cloud API responses all use a unified format. A status code of the format 2xx indicates a successful call, and a status code of the 4xx or 5xx format indicates a failed call. For successful calls, returned data can be in a XML or JSON format. You can specify the format of the returned data when sending a request. The default format is XML.

A RequestId is returned no matter if it is successful or not.
  • XML format
    <? xml version="1.0" encoding="utf-8"? > 
        <!—The root node of the result-->
            <!—The returned result-->
            <!—The returned result-->
  • JSON format
        /*The returned result*/