AVAILABLE FOR WEB, FLUTTER & QA PROJECTS
How to use this tool
1. Select Asset Archetype
Choose Hashed Static, HTML Pages, API Responses, Private Data, or Media Assets.
2. Set Cache Durations
Configure browser TTL (max-age) and shared CDN edge TTL (s-maxage).
3. Toggle Modern Directives
Enable stale-while-revalidate, immutable, must-revalidate, or no-store.
4. Copy Server Config Snippets
Export ready-to-paste configurations for Next.js, Nginx, Apache, or Cloudflare.
Formula or logic used
HTTP Cache-Control Directives & Precedence
Defines cache visibility, expiration intervals, background revalidation windows, and client revalidation rules.
public vs private: public allows CDN edge caching; private restricts storage to the user's local browsers-maxage overrides max-age on shared CDN caches (Cloudflare, Vercel, Fastly)stale-while-revalidate serves cached responses immediately while asynchronously revalidating in backgroundimmutable tells browsers the asset filename contains a hash and will never change during max-age
Examples
Example 1: Content-Hashed Static Assets (JS / CSS / WebP)
Browsers and CDNs cache the file for 1 full year without ever sending revalidation 304 checks.
Example 2: Dynamic High-Traffic Content Page (ISR Pattern)
Edge CDNs serve near-instantaneous responses while refreshing content silently in the background.
Common use cases
Next.js Custom Headers Configuration
Generate security and performance headers for next.config.ts async headers() declaration.
Nginx & Apache Server Hardening
Produce copy-paste location blocks for static media and font asset caching.
Cloudflare Edge Cache Optimization
Separate browser cache rules from CDN edge revalidation schedules using s-maxage.
API Bandwidth Protection
Shield backend microservices from duplicate API polling using stale-while-revalidate.
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Frequently asked questions
What does stale-while-revalidate do?
stale-while-revalidate instructs the browser or CDN to immediately return a cached stale response to the user while simultaneously launching a background request to fetch and cache the fresh version from the origin server.
Why should immutable be added to hashed static assets?
When a user reloads or refreshes a webpage, browsers typically send conditional HTTP requests (304 Not Modified checks) for cached assets. The immutable directive tells the browser the asset's content will never change, completely suppressing reload revalidation.
What is the difference between no-cache and no-store?
no-cache permits browsers to store the cached response, but requires validating with the server via ETag/If-None-Match before each use. no-store completely forbids any caching, forcing the browser to download a fresh copy on every request.
How does s-maxage interact with Cloudflare and Vercel?
s-maxage specifically instructs shared intermediary caches (CDNs and reverse proxies) how long to hold the asset, completely overriding the browser-facing max-age value.
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