Edge Caching
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The practice of storing cached content at edge servers located geographically close to end users, rather than at the origin server. Edge caches are the fundamental mechanism behind CDNs. They reduce origin server load, decrease latency, and improve availability. Edge caching decisions are driven by HTTP headers like Cache-Control, Vary, and CDN-specific headers like Cloudflare-CDN-Cache-Control or Surrogate-Control.