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curl — Command Line HTTP Client & API Debugger

Complete beginner guide to curl, testing REST APIs, inspecting HTTP response headers, verifying SSL/TLS certificates, and debugging response timing with command flag breakdowns.

JavaScript fetch() Basics — Asynchronous HTTP, JSON, and Error Handling

Complete beginner guide to the modern JavaScript fetch API, handling HTTP errors with res.ok, POSTing JSON payloads, and request timeouts with AbortController.