Introducing Cache Reserve: massively extending Cloudflare’s cache

Introduced Cache Reserve, a new persistent data store built on R2, to act as an ultimate upper-tier cache. Cache Reserve ensures all cacheable content is persistently served, regardless of request frequency, thereby increasing cache hit ratios and reducing origin egress fees. It complements the existing popularity-based cache and tiered cache by providing guaranteed SLAs for content storage duration. Cache Reserve respects cache-control headers and purge requests for content updates.