Rockxy

Rockxy is an open‑source HTTP debugging proxy built natively for macOS using Swift. It captures traffic traffic including HTTP, HTTPS, WebSocket, and GraphQL, by employing a SwiftNIO proxy with CONNECT tunneling and auto‑generated per‑host TLS certificates. The tool presents captured requests in a tabbed inspector that offers JSON tree view, hex dump, timing waterfall, and detailed header, cookie, and query information.

The proxy supports a range of modification and testing features: local and remote mapping, breakpoints for pausing and editing in‑flight traffic, request blocking, throttling, header alteration, and allow‑list or bypass modes. Users can extend functionality through sandboxed JavaScriptCore plugins, and the application correlates macOS system logs with network activity to identify the originating application. A Developer Setup Hub supplies guided snippets and validation for various runtimes, browsers, devices, and frameworks.

Rockxy is designed for high‑volume use, handling over 100 k requests with virtual scrolling, ring‑buffer eviction, and disk offloading to keep the UI responsive. It also includes an optional Model Context Protocol server that lets AI clients query live traffic and proxy status locally, with token‑based authentication and default redaction of sensitive data.