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Page 24 of 24
Explains how middleware order affects authentication, authorization, error handling, routing, CORS, and response behavior.
Explains cache memory growth, eviction, size limits, stale data, and why cache design needs explicit bounds.
Reviews a captive scoped dependency as both a lifetime and concurrency bug, then replaces it with explicit per-operation scopes and minimal immutable work data.
Diagnoses lost struct mutations and explains how readonly access can trigger defensive copies.
Explains local filesystem limits, multiple instances, in-memory state, distributed cache, durable storage, and scale-out-safe API design.
Separates memory visibility and ordering from atomic multi-step updates, avoiding volatile as a substitute for real synchronization.
Explains how to choose an E2E flow, control test data, avoid brittleness, and cover frontend/API integration risk.