what the 0002-00000502 error means and how to fix it-Object Storage Service(OSS)-阿里云帮助中心

Problem description

The format of the Date or x-oss-date request header is invalid.

Causes

The value of the Date request header is not in GMT format, or the value of the x-oss-date request header is not in ISO8601 format.

Problem Examples

You sent a request signed with a V4 signature.

Example 1

GET /oss.jpg?x-oss-signature-verion=OSS4-HMAC-SHA256&x-oss-credential=LTAI****************&x-oss-additional-headers=host&x-oss-signature=8u**** HTTP/1.1
Host: oss-example.oss-cn-hangzhou.aliyuncs.com
x-oss-date: Tue, 20 Dec 2022 08:48:18 GMT

The x-oss-date field must be in the ISO8601 format, such as 20221220T084818Z. In this example, the value of the field is Tue, 20 Dec 2022 08:48:18 GMT, which is an invalid format.

Example 2

GET /oss.jpg?x-oss-signature-verion=OSS4-HMAC-SHA256&x-oss-credential=LTAI****************&x-oss-additional-headers=host&x-oss-signature=8u**** HTTP/1.1
Host: oss-example.oss-cn-hangzhou.aliyuncs.com
Date: 20221220T084818Z

The Date request header must be in GMT format, such as Tue, 20 Dec 2022 08:48:18 GMT. In this example, the value of the request header is 20221220T084818Z, which is an invalid format.

Solutions

Set the value of the x-oss-date field to 20221220T084818Z.

GET /oss.jpg?x-oss-signature-verion=OSS4-HMAC-SHA256&x-oss-credential=LTAI****************&x-oss-additional-headers=host&x-oss-signature=8u**** HTTP/1.1
Host: oss-example.oss-cn-hangzhou.aliyuncs.com
x-oss-date: 20221220T084818Z

Set the value of the Date field to Tue, 20 Dec 2022 08:48:18 GMT.

GET /oss.jpg?x-oss-signature-verion=OSS4-HMAC-SHA256&x-oss-credential=LTAI****************&x-oss-additional-headers=host&x-oss-signature=8u**** HTTP/1.1
Host: oss-example.oss-cn-hangzhou.aliyuncs.com
Date: Tue, 20 Dec 2022 08:48:18 GMT

Note

You can use an SDK to send requests and implement v4 signing. For more information, see Overview of sending requests with Alibaba Cloud SDKs.

References

If you want to implement v4 signing yourself, you can refer to the SDK implementation. For more information, see Python SDK v4 signature implementation.
If you want to implement the signing logic yourself, you can refer to v1 signing. For more information, see Overview.