phy-http-cache-audit

HTTP caching header analyzer that checks Cache-Control directives, ETag/Last-Modified freshness, Vary correctness, CDN cache status (X-Cache, CF-Cache-Status, Age), and stale-while-revalidate opportunities for any URL or local dev server. Identifies assets that should be cached but aren't, misconfigured max-age values, cache poisoning risks (dangerous Vary headers), and missing immutable flags on hashed static files. Supports nginx, Apache, Cloudflare, Fastly, and Next.js config generation. Zero external API — uses only curl. Triggers on "cache headers", "caching audit", "cache-control", "CDN