HTTP Toolkit, developed by Tim Perry, is a cross-platform tool for intercepting, inspecting, and modifying HTTP, HTTPS, and WebSocket traffic. It helps developers and testers debug, validate, and build networked applications by capturing requests and responses from browsers, mobile devices, and backend services—without changing application code. You can examine headers, bodies, cookies, timing, and TLS details; set breakpoints; rewrite, redirect, or block traffic; and create realistic mocks to simulate backends, failures, and edge cases.
HTTP Toolkit supports HTTP/1.1 and HTTP/2, manages certificates for seamless HTTPS interception, and offers guided setup for popular clients such as Chrome, Edge, and Android. It runs on Windows, macOS, and Linux. Common use cases include reproducing tricky bugs, verifying integrations, throttling bandwidth, injecting latency and errors, and rapidly prototyping APIs. The project provides an open-source core, with optional paid features for advanced interception and automation.
HTTP Toolkit is developed by Tim Perry. The most popular versions of this product among our users are: 1.5, 1.6, 1.7, 1.8 and 1.9. The names of program executable files are HTTP Toolkit.exe, httptoolkit.exe.
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