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HTTP API Semantics - .NET Backend | Aporeon

HTTP API Semantics

HTTP methods, outcomes, update semantics, media types, caching, preconditions, browser access, streaming, and retry signals.

11 drillsPractice one at a timeOrdered pathConcept questionArchitecture scenarioComparison question

Recommended start

Safe and idempotent methods

Explains HTTP safety and idempotency, then connects those guarantees to retries, side effects, and API design.

Medium~7 minStep 1 of 11

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1Safe and idempotent methodsRecommended startExplains HTTP safety and idempotency, then connects those guarantees to retries, side effects, and API design.Concept questionMedium~7 min.NETASP.NET CorePractice 2

Practice order

11 drillsOne at a time

1Safe and idempotent methodsUp next / Medium / ~7 min
2Choose HTTP status codesMedium / ~10 min
3PUT vs PATCHMedium / ~7 min

Choose HTTP status codesMaps creation, updates, asynchronous work, validation, authorization, conflicts, and failures to useful HTTP outcomes.Architecture scenarioMedium~10 min.NETASP.NET Core

Practice

3PUT vs PATCHCompares replacement and partial-update semantics, including omitted fields, patch formats, validation, and concurrency.Comparison questionMedium~7 min.NETASP.NET CorePractice

4HTTP content negotiationDistinguishes request and response media types and designs predictable negotiation, rejection, documentation, and caching behavior.Concept questionMedium~7 minPractice

5API Cache-ControlChooses response cache directives for public, private, sensitive, and revalidated API data without leaking user-specific content.Architecture scenarioHard~12 min.NETASP.NET CorePractice

6ETag conditional GETImplements representation-aware ETags and conditional GETs correctly, including validators, 304 metadata, authorization, cache variation, generation cost, and tests.Concept questionHard~9 min.NETASP.NET CorePractice

7If-Match and lost updatesConnects HTTP preconditions to atomic database concurrency checks and honest 412 or 428 API behavior.Architecture scenarioHard~12 min.NETASP.NET CorePractice

8CORS and preflightExplains browser same-origin enforcement, preflight requests, credentials, middleware behavior, and why CORS is not authorization.Concept questionMedium~7 minPractice

9Stream large responsesDesigns cancellation-aware response streaming with bounded memory, correct resource ownership, and practical download behavior.Architecture scenarioHard~12 min.NETASP.NET CorePractice

10Retry signals and budgetsCoordinates server retry signals with client backoff, deadlines, idempotency, overload protection, and bounded retry budgets.Architecture scenarioHard~12 min.NETASP.NET CorePractice

11Output vs response cachingCompares server-controlled output caching with HTTP cache semantics and defines safe keys, variation, invalidation, identity, and multi-instance behavior.Comparison questionMedium~7 min.NETASP.NET CorePractice

4

HTTP content negotiation

Medium / ~7 min

5API Cache-ControlHard / ~12 min

6ETag conditional GETHard / ~9 min

7If-Match and lost updatesHard / ~12 min

8CORS and preflightMedium / ~7 min

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