Proxxi - Local HTTP/HTTPS Proxy Tool

⚠️ Work in progress - Not ready for release! ⚠️

What is Proxxi?

Proxxi is a local proxy server that lets you intercept and modify API responses. It's built on top of mitmproxy with a simple WinUI 3 interface.

Features

✔️ URL matching (exact or regex)

✔️ Static JSON response replacement

✔️ Python scripting for dynamic changes

✔️ HTTP status code matching

✔️ Toggle rules on/off

⚠️ Known Issues

Installation

• Python dependencies: Auto-install is unstable and might not detect globally installed packages

Functional Limitations

• Only works with JSON responses (no HTML/plain text support)
• Cannot modify HTTP headers
• No request type filtering (GET/POST/PUT/etc.)
• WebSockets not supported
• Potential memory leaks during long sessions

🚀 Usage

1. Configure your app to use: Address: 127.0.0.1 Port: 45871

2. For HTTPS traffic:

• Install mitmproxy certificate via Settings

3. Add target rules:

• Define URL patterns
• Set response modifications

4. Enable proxy in Settings tab

🔧 Proxifier Setup

For application-specific proxying (without system-wide changes):

1. Add Proxy Server

• Address: 127.0.0.1
• Port: 45871
• Protocol: HTTPS

2. Create Rule

• Select your target application
• Assign to Proxxi proxy profile

3. Enable Profile

• Activate the rule
• Verify traffic appears in Proxxi console