HTTPeep

A modern web debugging proxy written in Rust that captures and inspects HTTPS traffic in real time. It can intercept requests, apply rule‑based forwarding, mock responses with local files, and override DNS resolution. The tool runs on macOS, Windows, and Linux and provides a terminal‑based UI for visualizing request flow.

The core of the system is a composable rule engine where each rule consists of a match pattern, a series of actions, and a resolve step. Rules are defined in files, allowing version control, reuse, and chaining of multiple conditions and actions such as delay, throttling, body rewrite, or routing through an external proxy. Breakpoint debugging lets developers pause before a request is sent or before a response is returned, edit the data, and continue execution.

Additional features include mapping remote resources to local files, flexible domain resolution management, import/export of configurations, and support for team synchronization. The design targets developers who need programmable, repeatable HTTP debugging and traffic manipulation without modifying application code.