Cheolsu Proxy
Cheolsu Proxy is a free, open-source HTTP/HTTPS debugging proxy for capturing, examining, and changing network traffic in real time.
What Cheolsu Proxy is
Cheolsu Proxy is a free, open-source HTTP/HTTPS debugging proxy for capturing, examining, and changing network traffic in real time. It can block traffic, modify requests or responses, map requests locally or remotely, and apply breakpoint rules. WebSocket work includes detection for plain text, Socket.IO, and MQTT, with message injection. JavaScript and TypeScript hooks based on Deno Core can process requests, responses, and WebSocket traffic. Server Replay stores captured responses and returns them for identical requests, while HAR export uses HTTP Archive 1.2. Cheolsu-Query provides traffic filtering, and authenticated upstream proxy chaining is supported. A desktop GUI, terminal TUI, and MCP Server use the same proxy daemon, allowing multiple clients at once; the MCP Server connects with assistants including Claude Code and Cursor. The published build supports Apple Silicon Macs only. Intel macOS is not built, and Windows and Linux are listed as coming soon.
Good
- Free and distributed under MIT and Apache 2.0
- Edits requests and responses with breakpoint rules
- Inspects and injects WebSocket messages
- Replays traffic and exports HAR files
- Supports authenticated upstream proxy chaining
Watch out
- Published build supports Apple Silicon only
- Intel macOS build is not provided
- Windows and Linux are coming soon
- macOS may block its unsigned build
Who it suits
Cheolsu Proxy suits developers debugging HTTP, HTTPS, and WebSocket traffic on Apple Silicon Macs. The GUI targets most users, while the TUI suits command-line users.
Verdict
Cheolsu Proxy brings editing, replay, filtering, scripting, and WebSocket inspection into one proxy daemon. Platform support is currently limited to Apple Silicon macOS, and the first launch may require Gatekeeper handling.
The facts
Each one read from Cheolsu Proxy's own pages, with the date it was checked.
What it does
- AI integrations
- Its MCP Server integrates with AI assistants including Claude Code and Cursor.checked 9 Oct 2026
- Available build
- The published desktop build is for Apple Silicon (M1/M2/M3/M4); an Intel x64 build is not provided.checked 9 Oct 2026
- Download limitation
- The published download is an Apple Silicon build, and an Intel x64 build is not provided.checked 9 Oct 2026
- Filtering and export
- Cheolsu Proxy provides the Cheolsu-Query traffic-filtering language and exports traffic in HTTP Archive 1.2 format.checked 9 Oct 2026
- Intended users
- The installation guide recommends the desktop GUI as the starting point for most users and describes the TUI as suited to developers who prefer the command line.checked 9 Oct 2026
- Intercept rules
- Its five intercept actions are Block, Modify Request/Response, Map Local, and Map Remote.checked 9 Oct 2026
- Interfaces
- It provides a desktop GUI, terminal TUI, and MCP Server interface, all powered by the same proxy daemon.checked 9 Oct 2026
- License
- The project is distributed under the MIT and Apache 2.0 licenses.checked 9 Oct 2026
- Multiple clients
- Multiple clients can connect to the same proxy daemon simultaneously.checked 9 Oct 2026
- Project origin and license
- The project says it was forked from Proxelar and is distributed under the MIT and Apache 2.0 licenses.checked 9 Oct 2026
- Proxy interfaces
- It provides a Tauri desktop GUI, a terminal TUI, and an MCP Server, all powered by the same proxy daemon.checked 9 Oct 2026
- Purpose
- Cheolsu Proxy is an HTTP/HTTPS debugging proxy for capturing, analyzing, and modifying network traffic in real time.checked 9 Oct 2026
- Replay and export
- Server Replay caches captured responses for identical requests, and the proxy supports HAR export in HTTP Archive 1.2 format.checked 9 Oct 2026
- Scripting
- JavaScript and TypeScript hooks based on Deno Core can handle requests, responses, and WebSocket traffic.checked 9 Oct 2026
- Server replay
- Server Replay caches captured responses and automatically returns them for identical requests.checked 9 Oct 2026
- Signing status
- The current build is not Apple-notarized or signed, and macOS Gatekeeper may block its first launch.checked 9 Oct 2026
- System requirements
- The installation page lists Apple Silicon macOS as supported, macOS Intel/x64 as not built, and Windows and Linux as coming soon.checked 9 Oct 2026
- TLS
- The proxy uses a hybrid TLS engine that switches between rustls and native-tls.checked 9 Oct 2026
- Upstream proxy
- It supports proxy chaining through an upstream proxy with authentication.checked 9 Oct 2026
- WebSocket
- It supports plain text, Socket.IO, and MQTT detection, with message injection.checked 9 Oct 2026
- WebSocket support
- It supports WebSocket traffic, including Plain Text, Socket.IO, and MQTT protocol detection and message injection.checked 9 Oct 2026
Where it runs
- Platform availability
- The installation guide lists macOS Apple Silicon as supported; Intel macOS is not built, and Windows and Linux are marked coming soon.checked 9 Oct 2026
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