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Summary: Currently, before we store the image to cache, we only respect `Cache-Control`, actually, we also may need to check `Expires`、`Last-Modified`, refer to [MDN docs](https://developer.mozilla.org/en-US/docs/Web/HTTP/Caching#Freshness), and [okhttp](https://github.com/square/okhttp/blob/568a91c44a118b2c2ba62d310a331582c567b24a/okhttp/src/main/java/okhttp3/internal/cache/CacheStrategy.java#L268) respect the `MDN`, so in iOS, we can also respect this. [iOS] [Fixed] - Respect `MDN` cache strategy before cache the image. After `PR`, if image's response do not contains `Cache-Control`, it would also checks `Expires`、`Last-Modified` refers to [MDN docs](https://developer.mozilla.org/en-US/docs/Web/HTTP/Caching#Freshness). Pull Request resolved: https://github.com/facebook/react-native/pull/23226 Differential Revision: D13895627 Pulled By: cpojer fbshipit-source-id: aa377511c31badd752d7887ed6cbcdf6be4b80b3