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In-depth guides on web security headers, CORS, CSP, and performance.
Security Headers Guide
What HSTS, CSP, framing, and isolation headers do—with Nginx, Apache, and Vercel patterns.
CORS Guide
Preflight, credentials, CDNs, and fixes for Express, Nginx, FastAPI, and Django.
Content Security Policy Guide
Directives, report-only rollouts, nonces, and killing unsafe-inline without breaking prod.
Web Performance Guide
PageSpeed wins you can get from server config: caching, compression, and honest measurement.