The concept of cache, and how to implement caching (Etag and last-modified priority)

https://www.cnblogs.com/chenqf/p/6386163.html

1. HTTP caching :

　　Forced Cache: Cache-Control: public / private / no-cache / no-store / max-age = xxx

　　　　　　　Expires expiration time, an absolute time server time there is local time inconsistency will lead cause cache invalidation

　　Negotiation cache: Etag <----> If-None-Match

　　　　　　   Last-modify<----->If-Modify-since

　　Priority: Cache-Control> Expires> Etag> Last-modify

 

2. The browser's cache : webStorage (localStorage, sessionStorage)

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