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Aporeon

Technical interview practice, from one developer to another.

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API Security & Auth

API Protection

CORS, CSRF, rate limiting, overposting, safe errors, secrets, security headers, TLS, and browser-facing API hardening.

8 drillsPractice one at a timeOrdered pathConcept questionComparison questionArchitecture scenario

Recommended start

CORS Boundary

Explains what CORS controls, what it does not protect, and why APIs still need authentication and authorization.

Easy~5 minStep 1 of 8

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1CORS BoundaryRecommended startExplains what CORS controls, what it does not protect, and why APIs still need authentication and authorization.Concept questionEasy~5 min.NETASP.NET CoreJWTPractice 2CSRFExplains when CSRF matters, how cookies change browser behavior, and what mitigations fit API clients.Comparison questionMedium~7 min.NETASP.NET CoreJWTPractice 3Rate LimitsExplains rate-limit identity, endpoint cost, login and suggestion throttles, Redis counters, user experience, and observability.Concept questionMedium~7 min.NETASP.NET CoreJWTPractice 4OverpostingExplains why request DTOs should expose only allowed fields and how server-owned fields stay protected.Concept questionMedium~7 min.NETASP.NET CoreJWTPractice 5Safe ErrorsExplains safe error responses for auth failures, validation failures, server errors, and sensitive resource access.Concept questionEasy~5 min.NETASP.NET CoreJWTPractice 6Secret StorageExplains where secrets and tokens should live, what not to log, how rotation works, and how client storage changes risk.Concept questionMedium~7 min.NETASP.NET CoreAzure Key VaultPractice 7Headers and TLSExplains HTTPS, HSTS, secure cookies, HttpOnly, SameSite, no-store, and practical API/browser security hardening.Concept questionMedium~7 min.NETASP.NET CoreJWTPractice 8Prevent SSRFSecures webhooks, previews, imports, and remote-file fetches with destination policy, DNS and redirect defenses, egress controls, limits, and observability.Architecture scenarioHard~12 min.NETASP.NET CorePractice

Practice order

8 drillsOne at a time

1CORS BoundaryUp next / Easy / ~5 min
2CSRFMedium / ~7 min
3Rate LimitsMedium / ~7 min
4OverpostingMedium / ~7 min
5Safe ErrorsEasy / ~5 min
6Secret StorageMedium / ~7 min
7Headers and TLSMedium / ~7 min
8Prevent SSRFHard / ~12 min