REST APIs for IT Professionals

An API returning status 200 is the beginning of validation, not the end. A collector may receive only the first page, accept an HTML sign-in page as data, follow an unexpected next link, or retry forever after a rate limit. This course builds a small client that makes those failure modes visible and refuses to turn partial collection into an authoritative inventory.

You will understand an HTTP request/response contract, distinguish authentication from permission, interpret JSON, traverse bounded pages, handle selected transient failures, and build a reproducible test package. The code uses invented responses and a reserved example hostname. It makes no network requests, contains no credentials and changes no tenant. No cloud account or book purchase is required.

Python Foundations is recommended for the executable project. Learners concentrating on operational API concepts can trace the fixtures and test matrix before writing their own adapter. Use Python 3.10 or later in a local practice directory; the code requires only the standard library. The inventory-reconciliation course is a useful next step because it consumes the kind of export this client is designed to produce.

Four chapters, with practical work

1. Read the contract behind a request
2. Validate pages and follow links within a boundary
3. Add bounded retries and a working collector
4. Independent tests, an export adapter and an operational review

Applied capability and learning route

Design safe request handling for pagination, retries and uncertain write outcomes.

Follow the lessons in order: establish the model, trace the supplied evidence, attempt the case, compare the worked solution, and complete the changed-condition project. The target is intermediate reasoning within this stated scope, not mastery of the entire profession or product. If a prerequisite is unfamiliar, pause and use the linked foundational teaching before attempting the project.

All teaching, explained answers and core synthetic practice are free. Some operational labs require separately available software, a licensed test tenant or an authorized lab; offline completion does not claim hands-on product proficiency.

How to complete this course

Study the worked examples, attempt the exercises before opening solutions, and submit your own project notes. Completion records are self-reported; practical competence requires the stated verification.