0002-00000502

Problem description

The Date or x-oss-date header in the request uses an invalid format.

Causes

OSS enforces distinct format requirements for each header:

Examples

The following examples show requests that use the V4 signature with incorrectly formatted headers.

Example 1 — Wrong format for `x-oss-date`

The x-oss-date header must use ISO 8601 format (YYYYMMDD'T'HHMMSS'Z'). The following request uses the GMT format instead, which is invalid for this header.

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

Example 2 — Wrong format for `Date`

The Date header must use GMT format. The following request uses the ISO 8601 format instead, which is invalid for this header.

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

Solutions

Fix the header value to match the required format.

• To fix the x-oss-date header, set its value to ISO 8601 format (YYYYMMDD'T'HHMMSS'Z'):

  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

• To fix the Date header, set its value to GMT format:

  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

References

• For a V4 signature implementation example using the OSS SDK for Python, see Calculate V4 signature by using OSS SDK for Python.

• For the V1 signature logic, see Overview.