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Add MRAP support for CRT s3transfer integration #9076

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This PR patches a gap with SigV4a signing for the CRT S3 transfer manager. On performance-optimized instance types [list], the CRT will auto-enable itself for all high-level aws s3 commands. This may lead to signature mismatches for Multi-Region Access Points backed by buckets in other regions.

Customers currently encountering this issue can bypass the problem by setting preferred_transfer_client to classic (docs). That mitigation will no longer be needed after this patch is merged.

awscli/s3transfer/crt.py Outdated Show resolved Hide resolved
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