Tim Perry maintains HTTP Toolkit, an open-source desktop application that intercepts, inspects and rewrites HTTP and HTTPS traffic across Windows, macOS and Linux. Aimed at developers, QA engineers and API designers, the toolkit presents a polished interface for setting up instant proxies, recording live traffic, editing headers in flight and exporting complete request/response logs to HAR or other formats. Typical use cases include debugging mobile app APIs, validating webhook payloads, simulating error responses, testing edge cases in GraphQL or REST endpoints, and teaching web protocols through live demonstrations. The software supports automatic certificate injection for seamless HTTPS interception, integrates with Docker, Android emulators and browsers, and exposes a rules engine for injecting delays, timeouts or custom JSON replies without touching server code. Users can pin particular exchanges, diff requests side-by-side, or share captured sessions with teammates for collaborative troubleshooting. Lightweight installers, dark and light themes, plus a library of ready-made traffic templates further streamline adoption for classroom workshops or enterprise sprint reviews. HTTP Toolkit is available for free on get.nero.com, where downloads are delivered through trusted Windows package sources such as winget, always pull the latest version, and can be queued for batch installation alongside other tools.
HTTP Toolkit is a beautiful & open-source tool for debugging, testing and building with HTTP(S) on Windows, Linux & Mac.
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