HTTP Toolkit is a beautiful, cross-platform & open-source HTTP(S) debugging proxy, analyzer & client, with built-in support for modern tools from Docker to Android to GraphQL. Setup with one click to start seeing exactly what your code is sending. Diff requests or responses, and explore overall metrics, to understand in depth. Change live traffic content, and simulate errors or performance problems to test your system. Rapidly prototype requests or responses, from real traffic or from scratch, and export to shareable traffic recordings or ready-to-use code. Debug, test & build with HTTP(S), with a powerful suite of tools designed for modern development.