public static function mayHaveBody($code)
    {
        return

            // True if not in 100s

            ($code < self::HTTP_CONTINUE || $code >= self::HTTP_OK)

            && // and not 204 NO CONTENT

            $code != self::HTTP_NO_CONTENT

            && // and not 304 NOT MODIFIED

            $code != self::HTTP_NOT_MODIFIED;
    }