How does ASP.NET Core Middleware Pipeline change at 10× traffic?

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Quick interview answer

At 10× traffic, ASP.NET Core Middleware Pipeline usually hits queueing and CPU/I/O saturation first — mitigate with concurrency limits, batching, caching, and offloading. Common mistakes: Placing UseAuthentication after UseAuthorization; forgetting UseRouting. Best practices: Follow Microsoft template order; use MapWhen for branch pipelines.

Detailed answer

At 10× traffic for ASP.NET Core Middleware Pipeline: 1) Bottleneck shifts from “works on my laptop” to queue delay and resource saturation. 2) Protect the loop/path: timeouts, bulkheads, backpressure, worker offload for CPU work. 3) Scale out carefully: sticky vs stateless, connection pools, cache hit ratio. 4) Prove with load tests that p99 stays inside SLO. Example to cite: Custom correlation ID middleware adds X-Request-Id header before logging middleware runs. Parent context: Common mistakes: Placing UseAuthentication after UseAuthorization; forgetting UseRouting. Best practices: Follow Microsoft template order; use MapWhen for branch pipelines.

Full explanation

Focus on what breaks first and how you keep ASP.NET Core Middleware Pipeline correct under load. 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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