ASP.NET Core Middleware Pipeline
As a Fresher engineer, explain ASP.NET Core Middleware Pipeline. What problem does it solve and how would you describe it in an interview?
Answers use simple, clear English.
Quick interview answer
At Fresher depth: start with the problem, then mechanism, then a short example. Request flows through middleware chain: Exception → HTTPS → Routing → Auth → Endpoints.
Detailed answer
At Fresher depth: start with the problem, then mechanism, then a short example. Request flows through middleware chain: Exception → HTTPS → Routing → Auth → Endpoints. Each can short-circuit or call next(). Order matters critically. Core: Request flows through middleware chain: Exception → HTTPS → Routing → Auth → Endpoints. Each can short-circuit or call next(). Order matters critically. Real-time example: Custom correlation ID middleware adds X-Request-Id header before logging middleware runs. Pros: Composable cross-cutting pipeline; same model for minimal APIs and MVC. Cons: Wrong order breaks auth/CORS; async middleware must await next(). Common mistakes: Placing UseAuthentication after UseAuthorization; forgetting UseRouting. Best practices: Follow Microsoft template order; use MapWhen for branch pipelines. Audience level: Fresher.
Full explanation
Request flows through middleware chain: Exception → HTTPS → Routing → Auth → Endpoints. Each can short-circuit or call next(). Order matters critically.
Real example & use case
Custom correlation ID middleware adds X-Request-Id header before logging middleware runs.
Pros & cons
Pros: Composable cross-cutting pipeline; same model for minimal APIs and MVC. Cons: Wrong order breaks auth/CORS; async middleware must await next().
Common mistakes
Placing UseAuthentication after UseAuthorization; forgetting UseRouting.
Best practices
Follow Microsoft template order; use MapWhen for branch pipelines.
Follow-up questions
Open one as its own read / solve / listen card