[request]: SIGv4A signing

[jdisanti]

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Tell us about your request
SIGv4A is needed to use S3 Multi-region Access Points.

[jdisanti]

Tracking implementation in smithy-lang/smithy-rs#1797

[ymwjbxxq]

Do we have an ETA, more or less?
Today I stumble upon this problem, and would be great to know a date more or less

Signature Version 4 is the AWS signing protocol. AWS also supports an extension, Signature Version 4A, which supports signatures for multi-Region API requests. For more information, see the [sigv4a-signing-examples](https://github.com/aws-samples/sigv4a-signing-examples) project on GitHub.

 https://docs.aws.amazon.com/general/latest/gr/signing-aws-api-requests.html

[jdisanti]

SigV4a was shipped in the November 2nd release.

[github-actions]

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