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8.9Key Takeaways
- Know all HTTP methods and their idempotency characteristics
- Test both success and error status codes (especially 400, 401, 403, 404, 409, 429)
- Verify response headers, not just body — security headers, CORS, caching
- Understand the difference between query parameters (GET) and request body (POST/PUT)
- Content-Type mismatches cause silent failures — always verify