def _parse_cachecontrol(self, r):
        if r not in self._cc_parsed:
            cch = r.headers.get(b'Cache-Control', b'')
            parsed = parse_cachecontrol(cch)
            if isinstance(r, Response):
                for key in self.ignore_response_cache_controls:
                    parsed.pop(key, None)
            self._cc_parsed[r] = parsed
        return self._cc_parsed[r]
dataset/ETHPy150Open scrapy/scrapy/scrapy/extensions/httpcache.py/RFC2616Policy._parse_cachecontrol/original