CDN Caching and Content Delivery Questions

Strategies and operational trade offs for caching and delivering content at edge locations. Coverage includes HTTP caching semantics and headers, cache keys and cache partitioning, edge caching versus origin, cache invalidation and purge workflows, origin shielding, serving dynamic content through caches, cost and latency trade offs, handling origin outages with cache fallbacks, signed and private content delivery, and metrics and testing approaches for content correctness and cache efficiency.