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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.
Meta Tags
HTML elements in the page head that provide metadata about the document for browsers, search engines, and social media platforms.
JSON Schema
A vocabulary for validating the structure and content of JSON data, ensuring API requests and responses conform to expected formats.
WebAssembly (Wasm)
A binary instruction format that enables near-native performance execution of code in web browsers alongside JavaScript.
Cookie
A small piece of data stored in the browser by a website to remember user preferences, login state, or tracking information.
HTTP/3
The latest HTTP version that uses QUIC instead of TCP, providing faster connections and better performance on unreliable networks.
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