Reduce origin load, save on cloud egress fees, and maximize cache hits with Cache Reserve

What this post added

Introduced Cache Reserve as an open beta feature, acting as an ultimate upper-tier cache leveraging R2 storage. Cache Reserve stores content for longer periods (default 30 days) to reduce cache eviction and origin egress fees, especially for long-tail content. It is built on Cloudflare's developer platform (Workers, Durable Objects) and integrates with Pingora and Tiered Cache. The post details the architecture of Cache Reserve, including how it writes to R2 on cache misses and serves content from R2 on subsequent requests, sharding assets across buckets for load distribution.