How would you debug production issues related to ASP.NET Core Middleware Pipeline?

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Quick interview answer

Debug ASP.NET Core Middleware Pipeline by confirming blast radius, checking lag/error metrics, grabbing profiles/traces, then mitigating before deep root-cause. Common mistakes: Placing UseAuthentication after UseAuthorization; forgetting UseRouting. Best practices: Follow Microsoft template order; use MapWhen for branch pipelines.

Detailed answer

Production debug playbook for ASP.NET Core Middleware Pipeline: 1) Stabilize: rate-limit, shed load, or roll back if users are hurting. 2) Orient: dashboards for latency, errors, saturation tied to ASP.NET Core Middleware Pipeline. 3) Evidence: traces, profiles, logs with correlation IDs. 4) Hypothesize + prove with a safe experiment. 5) Fix + add a regression test/alert so it cannot silently return. Watch for: Placing UseAuthentication after UseAuthorization; forgetting UseRouting. Parent context: Common mistakes: Placing UseAuthentication after UseAuthorization; forgetting UseRouting. Best practices: Follow Microsoft template order; use MapWhen for branch pipelines.

Full explanation

Interviewers score structured incident thinking: mitigate → measure → root cause → prevent. Request flows through middleware chain: Exception → HTTPS → Routing → Auth → Endpoints. Each can short-circuit or call next(). Order matters critically.

Follow-up questions

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Parent context — ASP.NET Core Middleware Pipeline

Common mistakes: Placing UseAuthentication after UseAuthorization; forgetting UseRouting. Best practices: Follow Microsoft template order; use MapWhen for branch pipelines.

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