How HTTP Cache-Control Headers Can Replace Redis and CDN Infrastructure

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The Cache-Control response header allows developers to manage API caching across browsers, proxies, and CDNs without running additional infrastructure. Key directives include max-age, which defines how long a response stays fresh, and public or private, which controls whether shared caches can store user-specific data. A commonly misunderstood directive, no-cache, does not prevent caching but instead requires revalidation with the origin server before each use. The stale-while-revalidate directive addresses cache stampede problems by serving stale content instantly while refreshing it in the background, ensuring no request is blocked on expiry. Developers are advised to combine short max-age values with a longer stale-while-revalidate window and ETags for efficient, low-latency API caching.

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