0002-00000410

Problem description

The X-Amz-Algorithm field in the request is missing.

Causes

You initiated a request that uses an Amazon S3-compatible V4 signature. However, the X-Amz-Algorithm field, which specifies the signing algorithm, is absent from the request.

Examples

The following request is missing X-Amz-Algorithm:

GET /test.txt?X-Amz-Credential=LTAI****************/20221220/us-east-1/s3/aws4_request&X-Amz-Date=20221220T084818Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&X-Amz-Signature=ab2s**** HTTP/1.0
Date: Tue, 20 Dec 2022 08:48:18 GMT
Host: oss-example.oss-cn-hangzhou.aliyuncs.com
x-oss-s3-compat: true

Solutions

Make sure that the URL query string contains the following required fields: X-Amz-Algorithm, X-Amz-Credential, X-Amz-Signature, X-Amz-Date, X-Amz-SignedHeaders, and X-Amz-Expires. The following example shows a correctly formed request:

GET /test.txt?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=LTAI****************/20221220/us-east-1/s3/aws4_request&X-Amz-Date=20221220T084818Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&X-Amz-Signature=ab2s**** HTTP/1.0
Date: Tue, 20 Dec 2022 08:48:18 GMT
Host: oss-example.oss-cn-hangzhou.aliyuncs.com
x-oss-s3-compat: true

To avoid manually constructing presigned URLs, use an Amazon S3 SDK to generate them. SDKs handle all SigV4 signing parameters automatically. For setup and code examples, see Use Amazon S3 SDKs to access OSS.