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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

REST (Representational State Transfer)
An architectural style for designing networked applications using standard HTTP methods and stateless communication.
SSR (Server-Side Rendering)
A technique where web pages are rendered on the server and sent as complete HTML to the browser, improving SEO and initial load time.
Server-Sent Events (SSE)
A web technology enabling servers to push real-time updates to browsers over a single HTTP connection, simpler than WebSockets.
Idempotency
A property where performing an operation multiple times produces the same result as performing it once.
SEO (Search Engine Optimization)
The practice of optimizing websites to rank higher in search engine results, increasing organic traffic.
Middleware
Software that sits between the request and response in a web application, performing processing like authentication or logging.
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