class Aws::Plugins::S3RequestSigner::SigningHandler

def regional_sigv(context)
  # Drop back to older S3 signature version when uploading objects for
  # better performance. This optimization may be removed at some point
  # in favor of always using signature version 4.
  if V2_REGIONS.include?(context.config.region)
    uploading_file?(context) && !kms_encrypted?(context) ? :s3 : :v4
  else
    :v4
  end
end