Revision Sheet
Network Strategy
Choose caching, realtime transport, and request lifecycle behavior according to freshness, reliability, cancellation, and user impact.
Security Boundaries
CORS, cookies, CSP, XSS, CSRF, and clickjacking controls are layered defenses. Do not rely on UI hiding for security.
Debugging Signals
Use Performance APIs, Core Web Vitals, bundle traces, memory profiles, and security reports to diagnose production issues.