Cache-Invalidation

Caching Strategies for High-Performance Web Apps Caching is a core tool to speed up web apps. It reduces latency, lowers server load, and improves resilience. A good strategy uses multiple layers: the browser, a content delivery network (CDN) at the edge, and the origin server. When each layer is configured well, users see fast pages even during traffic spikes. Browser caching and validation The browser can serve many resources directly if they are marked as cacheable. Use clear Cache-Control headers and a sensible max-age. Public is appropriate for static assets, while private can protect personal data. Include a validator like ETag or Last-Modified so the browser can check if content changed without downloading everything again. Small, immutable assets should be served with long TTLs to maximize reuse. ...

CDN Strategies for Global Performance Global users expect fast access to content. A solid CDN strategy brings your site closer to readers by using many edge servers around the world. Start with a reputable CDN provider, and consider a multi-CDN setup if you need higher availability or regional control. The main goal is to reduce round trips and keep load times low when traffic spikes or regions shift. Edge caching and smart cache keys help you stay quick. Set reasonable TTLs for static assets, and use cache keys that reflect content variations like language or device. If your CDN supports it, use a stale-while-revalidate pattern to serve a fast reply while fresh content is fetched in the background. For dynamic parts, consider edge rules that serve from cache for non-personalized pieces, then reach the origin only for updates. ...