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Web Development Intermediate

What is Web Caching Strategies?

Techniques for storing copies of web resources at various levels to reduce server load, bandwidth, and response times.

Web caching operates at multiple levels: browser cache (local storage of resources), CDN cache (edge server copies), reverse proxy cache (Nginx, Varnish), and application cache (Redis, Memcached). HTTP cache headers control behavior: Cache-Control (max-age, no-cache, no-store, public/private), ETag (content hash for conditional requests), Last-Modified (timestamp-based validation), and Vary (cache variations by header). Strategies include cache-first (serve cached version, update in background), network-first (try server, fall back to cache), and stale-while-revalidate (serve stale content while fetching fresh). Cache invalidation remains one of computing's hardest problems — techniques include versioned URLs, cache tags, and purge APIs.

Related Terms

GraphQL
A query language for APIs that lets clients request exactly the data they need, reducing over-fetching and under-fetching.
Webhook
A mechanism where a server sends real-time HTTP POST notifications to a specified URL when specific events occur.
Progressive Web App (PWA)
A web application that uses modern web capabilities to deliver app-like experiences with offline support and push notifications.
TypeScript
A typed superset of JavaScript that adds static type checking, interfaces, and advanced IDE support to JavaScript development.
MVC (Model-View-Controller)
An architectural pattern that separates an application into three components: data (Model), interface (View), and logic (Controller).
Cookie
A small piece of data stored in the browser by a website to remember user preferences, login state, or tracking information.
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