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How Service Workers Enable Offline-First Progressive Web Apps

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A developer built a task-manager web app that failed completely when users lost internet connectivity, prompting a redesign using offline-first principles. The solution centered on Service Workers, background scripts that intercept network requests and serve cached content when a connection is unavailable. A cache-first strategy was applied to static assets like HTML, CSS, and JavaScript, while a network-first approach with a cache fallback was used for live API data. The implementation required registering a service worker, defining cache lists, and versioning caches carefully to prevent users from receiving outdated files. The author notes that the core setup demands surprisingly little code and no advanced distributed-systems knowledge.

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