Public request parameters must be included in every interface request. Developers need to provide these parameters when using Volcano Engine API; otherwise, the request will fail. All public request parameters start with a capital letter to distinguish API request parameters. ## Action and Version

tip

Action and Version must be included in the Query.

|**Name** |**Type** |**Required** |**Example value** |**Description** | |---|---|---|---|---| |Action |String |Yes |CreateDataMigrateTask |Interface name, indicates the operation to perform. List of supported operations for file storage; see [API Overview](https://www.volcengine.com/docs/6500/1277524). | |Version |String |Yes |2018\-01\-01 |API version information. The current version is `2018-01-01`. | |X\-Expires |Int |No |300 |Signature validity period in seconds. Default is 900 if not specified. | ## Signature parameters Signature parameters are required in requests and can be included in the Header or Query. ### Scenario for including in the Header |**Name** |**Type** |**Required** |**Description** |**Example value** | |---|---|---|---|---| |X\-Date |String |Yes |Use UTC time, accurate to seconds, and formatted using the ISO 8601 standard: `YYYYMMDD'T'HHMMSS'Z'`. |20201103T104027Z | |Authorization |String |Yes |HTTP standard authentication header field. The format is `HMAC-SHA256 Credential={AccessKeyId}/{ShortDate}/{Region}/{Service}/request, SignedHeaders={SignedHeaders}, Signature={Signature}`. |HMAC\-SHA256 Credential=AKLTMjI2ODVlYzI3ZGY1NGU4ZjhjYWRjMTlmNTM5OTZkYzE/20201230/cn\-north\-1/iam/request, SignedHeaders=content\-type;host;x\-content\-sha256;x\-date, Signature=28eeabbbd726b87002e0fe58ad8c1c768e619b06e2646f35b6ad7ed029a6d8a7 | The meaning of information in Authorization is detailed in the table below. |**Name** |**Type** |**Remarks** | |---|---|---| |AccessKey |String |Requested AccessKey information. For instructions on how to view the AK and SK, see [Viewing the Access Key ID and Secret Access Key](https://www.volcengine.com/docs/6291/65568). | |ShortDate |String |Short request date, accurate to day. Use UTC time, for example: 20180201. | |Region |String |Requested region, for example: North China 2 (Beijing): cn\-beijing. | |ServiceName |String |The requested service is currently `dms`. | |SignedHeaders |String |Headers involved in signing, separated by semicolons if there are multiple headers. | |Signature |String |Signature after calculation. For details about signature calculation, see [Signature Mechanism](https://www.volcengine.com/docs/6500/1285433). | ### Scenario in Query |**Name** |**Type** |**Required** |**Description** | |---|---|---|---| |X\-Date |String |Yes |20201103T104027Z, use UTC time, accurate to the second. | |X\-Algorithm |String |Yes |Fixed value: HMAC\-SHA256; reserved for future extensions. | |X\-Credential |String |Yes |Composed of `{AccessKey}/{ShortDate}/{Region}/{Service}/request`. | |X\-SignedHeaders |String |Yes |Headers participating in the signature are separated by semicolons. | |X\-Signature |String |Yes |Calculated signature. For details on how the signature is calculated, see [Signature Mechanism](https://www.volcengine.com/docs/6500/1285433). |

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