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Fixes #1683 Fixes #1684 Fixes #1685 Fixes #1690 Fixes #1691 Fixes #1692 Fixes #1694 Fixes #1695 This PR primarily focuses on error handling and checksum calculation for signed streaming requests of type `STREAMING-AWS4-HMAC-SHA256-PAYLOAD` and `STREAMING-AWS4-HMAC-SHA256-PAYLOAD-TRAILER`. It fixes the error type returned when the payload encoding is incorrect: the correct `IncompleteBody` error is now returned. Chunk size validation has been added, enforcing the rule that only the final chunk may be smaller than 8192 bytes. The `x-amz-trailer` header value is now validated against the checksum trailer present in the payload. For `STREAMING-AWS4-HMAC-SHA256-PAYLOAD-TRAILER` requests, if no checksum trailer is provided in the payload, the gateway now returns an `IncompleteBody` error. If there is a mismatch between the `x-amz-trailer` header and the checksum trailer in the payload, or if the checksum header key in the payload is invalid, a `MalformedTrailer` error is returned. The `x-amz-decoded-content-length` header value is now compared against the actual decoded payload length, and an `IncompleteBody` error is returned if there is a mismatch. Finally, the double checksum calculation issue has been fixed. For `STREAMING-AWS4-HMAC-SHA256-PAYLOAD-TRAILER` requests, the trailing checksum is now parsed from the request payload and stored in the backend, instead of being recalculated by the backend.