code: function(name) {
              if (qq.indexOf(qq.s3.util.UNPREFIXED_PARAM_NAMES, name) >= 0) {
                  return name;
              }
              return qq.s3.util.AWS_PARAM_PREFIX + name;
          }
docs: Create Prefixed request headers which are appropriate for S3.
  
  If the request header is appropriate for S3 (e.g. Cache-Control) then pass
  it along without a metadata prefix. For all other request header parameter names,
  apply qq.s3.util.AWS_PARAM_PREFIX before the name.
  See: http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPUT.html