class AWS::S3::Client

def extract_error_details response
  if 
    (response.http_response.status >= 300 ||
      response.request_type == :complete_multipart_upload) and
    body = response.http_response.body and
    error = Core::XML::Parser.parse(body) and
    error[:code]
  then
    [error[:code], error[:message]]
  end
end