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Aporeon interview preparation

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ASP.NET Core Framework Essentials

Request pipeline, middleware, routing, controllers, minimal APIs, binding, dependency injection, cancellation, options, configuration, HttpContext, proxy boundaries, and host lifecycle.

26 drillsPractice one at a timeOrdered pathConcept questionComparison questionArchitecture scenarioDebugging scenario

Recommended start

Request Pipeline

Explains how an HTTP request flows through ASP.NET Core middleware, routing, endpoint execution, and response generation.

Easy~5 minStep 1 of 26

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26 of 26 shown

1Request PipelineRecommended startExplains how an HTTP request flows through ASP.NET Core middleware, routing, endpoint execution, and response generation.Concept questionEasy~5 min.NETASP.NET CoreC#Practice 2Middleware OrderingExplains how middleware order affects authentication, authorization, error handling, routing, CORS, and response behavior.Concept questionMedium~7 min.NETASP.NET CoreC#Practice 3Routing & EndpointsExplains endpoint routing, route templates, HTTP method matching, endpoint metadata, and ambiguity problems.Concept questionMedium~7 min.NETASP.NET CoreC#Practice 4Controllers & ResultsExplains controller actions, result types, status codes, thin controllers, and HTTP response generation.Concept questionEasy~5 min.NETASP.NET CoreC#Practice 5Minimal APIsExplains minimal APIs, endpoint groups, dependency injection, typed results, filters, and when they fit real services.Concept questionMedium~7 min.NETASP.NET CoreC#Practice 6Model BindingExplains how route values, query strings, headers, and request bodies become typed endpoint input.Concept questionEasy~5 min.NETASP.NET CoreC#Practice 7DI LifetimesExplains transient, scoped, and singleton lifetimes in ASP.NET Core APIs and production bugs caused by wrong lifetime choices.Concept questionMedium~7 min.NETASP.NET CoreC#Practice 8CancellationToken in APIsPropagates request cancellation through async dependencies while keeping committed side effects and timeout policy explicit.Concept questionMedium~7 min.NETASP.NET CoreC#Practice 9Middleware vs FiltersCompare middleware and filters by scope, timing, endpoint context, and practical use cases.Comparison questionMedium~7 min.NETASP.NET CoreC#Practice 10Controllers vs Minimal APIsCompare endpoint styles in real services, including organization, conventions, testing, filters, and OpenAPI behavior.Comparison questionMedium~7 min.NETASP.NET CoreC#Practice 11Endpoint Filters vs MVC FiltersCompare minimal API endpoint filters and MVC filters by context, scope, and use case.Comparison questionMedium~7 min.NETASP.NET CoreC#Practice 12ActionResult vs Typed ResultsCompare controller ActionResult patterns with minimal API typed results and explicit HTTP outcomes.Comparison questionMedium~7 min.NETASP.NET CoreC#Practice 13Options lifetimes and validationChooses the correct typed-options lifetime, validates required configuration early, and handles runtime changes deliberately.Comparison questionMedium~7 min.NETASP.NET CoreC#Practice 14Configuration precedenceExplains how later configuration providers override earlier values and keeps secrets, environment overrides, and diagnostics within explicit boundaries.Architecture scenarioMedium~10 min.NETASP.NET CoreC#Practice 15DI scopes outside requestsCreates and disposes explicit service scopes for hosted, queued, and parallel work without sharing scoped dependencies across operations.Architecture scenarioHard~12 min.NETASP.NET CoreC#Practice 16HttpContext lifetimeKeeps HttpContext inside the active request, avoids concurrent access, and copies only immutable data needed by later work.Debugging scenarioHard~12 min.NETASP.NET CoreC#Practice 17Request body boundariesHandles the request body as a forward-only resource, buffers only when necessary, and enforces limits before large input consumes the service.Architecture scenarioHard~12 min.NETASP.NET CoreC#Practice 18Forwarded headersRestores client scheme, host, and address behind trusted proxies without accepting spoofed forwarding data from arbitrary callers.Architecture scenarioHard~12 min.NETASP.NET CoreC#Practice 19Application host lifecycleSeparates process start from readiness, coordinates hosted-service startup, and drains work within a bounded shutdown window.Architecture scenarioHard~12 min.NETASP.NET CoreC#Practice 20Multiple DI registrationsPredicts how the built-in container resolves repeated service registrations and chooses explicit selection without service-location logic.Architecture scenarioMedium~10 min.NETASP.NET CoreC#Practice 21Services vs PipelineSeparates dependency registration from per-request middleware and endpoint composition in modern ASP.NET Core startup.Comparison questionEasy~5 min.NETASP.NET CoreC#Practice 22Use, Run, and MapExplains middleware continuation, terminal delegates, path branches, short-circuiting, and two-way request and response flow.Comparison questionEasy~5 min.NETASP.NET CoreC#Practice 23ApiController ConventionsExplains attribute routing, binding-source inference, automatic validation responses, and where explicit domain validation still belongs.Concept questionEasy~6 min.NETASP.NET CoreC#Practice 24Kestrel & Reverse ProxySeparates the ASP.NET Core HTTP server from proxy, TLS, load-balancing, process-management, and forwarded-header responsibilities.Comparison questionMedium~7 min.NETASP.NET CoreC#Practice 25JSON ContractTreats serializer naming, nulls, enums, converters, dates, references, and polymorphism as versioned client-facing behavior.Architecture scenarioMedium~7 min.NETASP.NET CoreC#Practice 26Response Already StartedExplains why committed headers cannot be replaced, how streaming failures behave, and how middleware preserves response ownership.Debugging scenarioMedium~7 min.NETASP.NET CoreC#Practice

Practice order

26 drillsOne at a time

1Request PipelineUp next / Easy / ~5 min
2Middleware OrderingMedium / ~7 min
3Routing & EndpointsMedium / ~7 min
4Controllers & ResultsEasy / ~5 min
5Minimal APIsMedium / ~7 min
6Model BindingEasy / ~5 min
7DI LifetimesMedium / ~7 min
8CancellationToken in APIsMedium / ~7 min

+18 more drills in this section