Browser cache
HTTP cache header controls resource caching: Cache Control, ETag, Last Modified. Strong cache does not send requests, negotiate cache sends requests for verification.
CDN edge caching
The content distribution network caches static resources to global edge nodes for users to access nearby, reducing the pressure on the source site and improving loading speed. Suitable for CSS/JS/images/videos.
Server cache
Server caching of database query results, page fragments, and API responses. Commonly used: Redis, Memcached. Significantly reduce database pressure.
Cache Policy
Cache what: infrequently changing resources; How long to cache: Long cache for static resources, short cache or no cache for dynamic content; Cache failure: Active update or TTL expiration.
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