Phex

A Chromium-based browser (Chrome/Edge/Brave/etc.) extension that adds custom HTTP headers to requests for specific domains.

Installation

1. Open your Chromium-based browser and go to chrome://extensions/
2. Enable Developer mode (top right toggle)
3. Click Load unpacked
4. Select the Phex folder

Usage

1. Click the Phex extension icon in your browser toolbar
2. Add a rule:
   • Domain: The domain to match (e.g., example.com)
   • Header Name: The HTTP header name (e.g., Authorization)
   • Header Value: The header value (e.g., Bearer token123)
3. Click Add Rule
4. Rules are applied immediately to all matching requests

Features

• Toggle rules: Turn individual rules on/off without deleting them
• Reorder rules: Drag and drop to change priority (top = highest priority)
• Persistent storage: Rules are saved and persist across browser restarts

Testing

Visit https://httpbin.org/headers after adding a rule for httpbin.org to verify your custom header appears in the response.