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Mar 12, 2025
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chore(supplemental-docs): md5 fallback for DeleteObjects update #6932

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14 changes: 7 additions & 7 deletions supplemental-docs/MD5_FALLBACK.md
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## Background

In AWS SDK for JavaScript [v3.729.0](https://github.com/aws/aws-sdk-js-v3/releases/tag/v3.729.0),
we shipped a feature that [changed default object integrity in
S3](https://github.com/aws/aws-sdk-js-v3/issues/6810). The SDKs now default to using more modern
checksums (like CRC32) to ensure object integrity, whereas previously MD5 checksums were being used.
Some third-party S3-compatible services currently do not support these checksums. To our knowledge,
this affects only the S3 `DeleteObjects` operation.

In AWS SDK for JavaScript [v3.729.0](https://github.com/aws/aws-sdk-js-v3/releases/tag/v3.729.0), we
shipped a feature that [changed default object integrity in S3](https://github.com/aws/aws-sdk-js-v3/issues/6810).
The SDKs now default to using more modern checksums (like CRC32) to ensure object integrity, whereas
previously MD5 checksums were being used. Some third-party S3-compatible services currently do not
support these checksums and require MD5 checksums. Furthermore, the [DeleteObjects operation in S3
requires a Content-MD5 request header](https://docs.aws.amazon.com/AmazonS3/latest/API/API_DeleteObjects.html)
in which case too, you should use the MD5 fallback as noted below.
If you wish to fallback to the old behavior of sending MD5 checksums, for operations like
`DeleteObjectsCommand` this is how you can do it in AWS SDK for JavaScript v3:

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