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e69d073273
The gateway currently supports only Signature Version 4 (SigV4) authorization. Deprecated AWS SigV2 requests are now rejected with an AWS-specific `InvalidRequest` error for both Authorization-header requests and query-string requests(presigned URLs). This also fixes SigV4 Authorization-header handling for date headers. SigV4 accepts two date headers: `Date` and `X-Amz-Date`. `X-Amz-Date` takes precedence, but when it is missing, `Date` should be used. The gateway now uses the `Date` header with lower precedence when `X-Amz-Date` is not present. No SDK integration test was added for this case because the SDK always sets `X-Amz-Date`, and this behavior is not configurable.