def _getCacheHeaders(self, ttl):
        return {'Expires': strftime("%a, %d %b %Y %H:%M:%S GMT",
                                    gmtime(time() + ttl)),
                'Cache-Control': ttl % 'max-age=%d, public'}
dataset/ETHPy150Open dpgoetz/sos/sos/origin.py/CdnHandler._getCacheHeaders/swapped operands of `%`