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Golang / GoLang Production Patterns and Web Standards Interview Questions

What is the production readiness checklist for a Go HTTP service?

This summary covers the essential checks interviewers probe when asking 'is this service production-ready?' It combines all the topics from this set into a concise reference.

Production Readiness Checklist
CategoryRequirement
Error handlingAll errors wrapped with %w; errors.Is/As used for inspection; typed nil trap avoided
Contextcontext.Context propagated to all blocking operations; cancel always deferred
HTTP serverReadTimeout, WriteTimeout, IdleTimeout configured; graceful shutdown implemented
MiddlewareRecovery, logging, auth, metrics, rate limiting applied in correct order
LoggingStructured logging (slog) with request IDs; no sensitive data logged
MetricsPrometheus /metrics endpoint; request count, latency, error rate tracked
Health checks/healthz (liveness) and /readyz (readiness) endpoints
ConfigurationLoaded and validated at startup; no os.Getenv in business logic
SecurityJWT validated (alg checked); input sanitised; CORS configured
DatabaseConnection pool configured; all queries use context; rows.Close deferred
Graceful shutdownSIGTERM handled; in-flight requests drained; connections closed
TestingTable-driven tests; -race flag in CI; goleak in goroutine tests
Profilingpprof on internal port; not public-facing
Lintinggolangci-lint + govulncheck in CI pipeline
// One-line checklist for interview answers:

// 1. Errors: always wrap (%w), never swallow, typed nil trap avoided
// 2. Context: propagate to all I/O, defer cancel(), use r.Context() in handlers
// 3. HTTP server: set all timeouts, graceful shutdown on SIGTERM
// 4. Middleware chain: recovery → logging → auth → rate limiting → handler
// 5. Configuration: load + validate at startup, inject as struct
// 6. Health: /healthz (alive?) + /readyz (ready?) separate endpoints
// 7. Observability: structured logs + Prometheus metrics + pprof
// 8. Security: validate JWT alg, sanitise inputs, whitelist CORS origins
// 9. Testing: table-driven, -race, httptest.NewRecorder, mock via interfaces
// 10. CI: vet + golangci-lint + govulncheck + go test -race
Which timeout in http.Server prevents a slow client from holding a connection open while slowly sending a large request body?
In the middleware chain 'recovery → logging → auth → handler', why must recovery be the outermost middleware?

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