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Topic · 10 lessons

Web & Backend Technology

See the requests, services and data that make applications work.

Data and reliability

Retry a Request Without Repeating the ActionUnderstand how an operation identifier helps distinguish a retry from a new action.5 minLessonIs My Saved Page Still Current?Follow a browser checking a saved response before downloading it again.6 minLessonA Transfer Should Finish TogetherUse a fictional points transfer to understand committing and rolling back related changes.6 minLessonDatabases, Records and SQL Before InjectionUnderstand tables, queries and transactions before studying database attacks.7 minLessonHow Caching WorksCompare a cache hit with a miss, and see why freshness and cache keys are security decisions too.6 minLessonHow Message Queues WorkFollow a job from producer to consumer, then explore acknowledgement, retry and duplicate processing.6 minLesson

Requests and connections

HTTP Status CodesRead the server’s response as a useful signal, without mistaking a status code for the whole story.6 minLesson

Foundations

How APIs WorkFollow a client request through a service contract to data and back to a response.6 minLessonAPI Gateway ExplainedInspect the gateway’s routing and shared controls, then see which decisions still belong to the application.6 minLesson

Sessions and identity

Cookies and SessionsSee how an HTTP cookie can connect separate requests to server-side session state.6 minLesson

Paths through this topic

Technology fundamentals

Learn the normal system before its security failures.

Your first cybersecurity projects

Explore roles and build small, safe pieces of work you can explain.

Web and application security

Understand identity and requests before exploring security failures.