Common request parameters

Name

Type

Required

Description

Signature

String

Yes

The final signature string for the request. For more information, see Request signature.

AccessKeyId

String

Yes

The ID of the key used to access the service. For more information, see Create an AccessKey.

Action

String

Yes

The name of the API operation to call.

Format

String

No

The format of the response.

Valid values: JSON (default) and XML.

RegionId

String

No

The region that the API supports.

For example, cn-shanghai.

SignatureMethod

String

Yes

The signature method.

The value is HMAC-SHA1.

SignatureNonce

String

Yes

A unique random number for the signature. This number is used to prevent replay attacks. Use a different random number for each request. In Java, use java.util.UUID.randomUUID() to generate the number.

SignatureVersion

String

Yes

The version of the signature algorithm.

The value is 1.0.

Timestamp

String

Yes

The timestamp of the request. Use UTC time in the ISO 8601 standard format: YYYY-MM-DDThh:mm:ssZ.

For example, 2019-10-13T10:00:00Z represents 18:00:00 on October 13, 2019 (UTC+8).

Version

String

Yes

The version of the API. The format is YYYY-MM-DD.

The value is 2019-12-30.