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# How Does It Work
The caching is based on the url of the asset.
SPTPersistentCache is a LRU ([last recently used](https://en.wikipedia.org/wiki/Cache_replacement_policies#Least_recently_used_(LRU))) cache.
SPTPersistentCache is a LRU ([Least Recently Used](https://en.wikipedia.org/wiki/Cache_replacement_policies#Least_recently_used_(LRU))) cache.
# Restrictions
Currenly the uri of the resource that should be cached needs to have the appropriate file extension (one of `mp4`, `m4v` or `mov`). In order to be cached. In future versions (once dependencies allow access to the `content-type` header) this will no longer be necessary. You will also receive warnings in the xcode logs by using the `debug` mode. So if you are not 100% sure if your video is cached, check your xcode logs!
Currently, caching is only supported for URLs that end in a `.mp4`, `.m4v`, or `.mov` extension. In future versions, URLs that end in a query string (e.g. test.mp4?resolution=480p) will be support once dependencies allow access to the `Content-Type` header. At this time, HLS playlists (.m3u8) and videos that sideload text tracks are not supported and will bypass the cache.
You will also receive warnings in the Xcode logs by using the `debug` mode. So if you are not 100% sure if your video is cached, check your Xcode logs!
By default files expire after 30 days and the maxmimum cache size is 100mb.
