Common parameters, including common request parameters and common response parameters, are the API request parameters that are required in all API requests for a service.

Common request parameters

Common request parameters must be included in all API requests.
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 2019-03-15.
AccessKeyId String Yes The AccessKey ID provided to you by Alibaba Cloud.
Signature String Yes The signature string of the request. For more information about how signatures are calculated, see Request signatures.
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:mmZ format. The time must be in UTC. For example, 2013-08-15T12:00:00Z indicates 20:00:00 on August 15, 2013, UTC+8.
SignatureVersion String Yes The version of the signature encryption algorithm. Set the value to 1.0.
SignatureNonce String Yes A unique and random number that is used to prevent replay attacks. You must use different numbers for different requests.