class Aws::Plugins::HttpChecksum::Handler

def call(context)
  if checksum_required?(context) &&
     !context[:checksum_algorithms] && # skip in favor of flexible checksum
     !context[:s3_express_endpoint] # s3 express endpoints do not support md5
    body = context.http_request.body
    context.http_request.headers['Content-Md5'] ||= md5(body)
  end
  @handler.call(context)
end