public interface KeyHashingScheme
HttpCacheStorageinterface expects to use variant-annotated URLs for its storage keys, but Memcached has a maximum key size, we need to support mapping storage keys to cache keys. Clients can implement this interface to change the way the mapping is done (for example, to add a prefix to all cache keys to provide a form of memcached namespacing).
storageKey- what the higher-level HTTP cache wants to use as its key for looking up cache entries
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