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You can implement a caching delegate yourself. The cache simply needs to be an object that has `set(key, bodyStream, bodyMeta)`, `get(key)`, and `remove(key)` functions.
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Check the built-in [MemoryCache](src/classes/caching/memory_cache.js) and [FileSystemCache](src/classes/caching/file_system_cache.js) for examples.
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The set function must accept a key (which will be a string), a body stream, and a metadata object (which will be a JSON-serializable JS object). It must store these, and then return an object with a `bodyStream` property, containing a fresh, unread stream of the body content, as well as a `metaData` property, containing the same metaData that was passed in.
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The get function should accept a key and return undefined if no cached value is found, or else an object with a `bodyStream` property, containing a stream of the body content, as well as a `metaData` property, containing the metadata that was stored via the `set(key, bodyStream, bodyMeta)` function.
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