#Api Testing Postman Api Testing

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Clients and automation frameworks must enforce a sensible maximum number of redirects. #apiautomation #softwaretesting

When the API returns 300 Multiple Choices, we verified it clearly exposes all valid alternatives. #apiautomation #softwaretesting

Seamlessly migrating from /v1 → /v2 with redirects. Zero breaking changes, same behavior—users never notice, APIs stay smooth. #apiautomation #softwaretesting

Confirm that temporary redirects (302/307) allow reuse of the original endpoint for future requests. Verify permanent redirects (301/308) signal clients and search engines to stop using old URLs #apiautomation #softwaretesting

Confirm that important query parameters are retained when redirecting to a new URL. #apiautomation #softwaretesting

All in One API testing cheatsheet!

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Check the Answer… 👇 Interviewer 🧑‍💻: Your API works in Postman but not in the browser — why? 🚀 System Design:Your API works in Postman but not in the browser — why? 🌐 Big Picture Imagine your API is a club 🎶. A postman is like a VIP guest — it can walk in freely. A browser is a regular visitor and must follow extra rules 🚧 So the API works in Postman but not in the browser. 🚫 The Main Reason: CORS Browsers enforce a rule called CORS (Cross-Origin Resource Sharing): • “Is this website allowed to call this API?” • If not → browser blocks the response Postman doesn’t care about CORS. Browsers do. 🔐 Missing Headers Your API must explicitly say: • Which websites are allowed • Which methods (GET, POST) • Which headers are allowed Without these headers, the browser says ❌ 🧪 Preflight Request Confusion Browsers sometimes send a preflight request (OPTIONS) first: • “Hey API, is this call allowed?” • If your server doesn’t handle OPTIONS → request fails Postman skips this step. 🔑 Auth & Cookies Differences • Browser may send cookies automatically • API may reject them • Or expect tokens differently Same API, different behavior 🍪🔑 🧩 Simple Mental Picture Browser → CORS Check ❌ → API Postman → Direct Call ✅ → API Browsers are strict. Postman is relaxed. 🎯 Interview Wrap-Up Line APIs work in Postman but not browsers because browsers enforce extra security rules like CORS. #SystemDesignInterview #SystemDesign #TechSimplified #CORS #APIDesign WebSecurity BackendEngineering BrowserVsPostman

APIs behind proxies, load balancers, and CDNs often change redirect behavior. #apiautomation #softwaretesting

Use 303 See Other after POST to redirect users to a GET resource. It enforces POST-Redirect-GET, preventing duplicate submissions on refresh. #apiautomation #softwaretesting

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