AWS S3 SDK compatibility inconsistencies with R2

Incident Report for Cloudflare

Update

We are continuing to work on a fix for this issue.

Posted Jan 17, 2025 - 11:23 UTC

Identified

AWS recently updated their SDKs to enable CRC32 checksums on multiple object operations by default.
R2 does not currently support CRC32 checksums, and the default configurations will return header related errors such as Header 'x-amz-checksum-algorithm' with value 'CRC32' not implemented.

Impacted users can either pin AWS SDKs to a prior version or modify the configuration to restore the prior default behavior of not checking checksums on upload.

For more details, see the examples section of the R2 Docs for the relevant SDK:
https://developers.cloudflare.com/r2/examples/aws/

Posted Jan 17, 2025 - 03:20 UTC

This incident affects: Cloudflare Sites and Services (R2).

Cloudflare System Status