Whistle

Whistle is a cross-platform HTTP, HTTPS, HTTP/2, WebSocket, and TCP debugging proxy built on Node.js. It enables developers to inspect, intercept, modify, and replay network traffic through a rule-based configuration system with a built-in web UI accessible at http://localhost:8899.

Website: https://wproxy.org/whistle/ Documentation: https://wproxy.org/en/docs/ GitHub: https://github.com/avwo/whistle NPM: https://www.npmjs.com/package/whistle

Features

• Request and response interception and modification
• HTTP, HTTPS, HTTP/2, WebSocket, and TCP support
• Rule-based traffic modification engine
• Local file mapping and API mocking
• Built-in Weinre for remote DOM inspection
• Request Composer for replay and editing
• Plugin extensibility system
• Multiple proxy modes: HTTP, HTTPS, Socks, reverse proxy
• Cross-platform: macOS, Windows, Linux

Use Cases

• Frontend development API proxying
• Mobile app network debugging
• CORS configuration testing
• Request/response modification during development
• API mocking with local JSON files
• Remote debugging of web pages on devices
• Traffic inspection and analysis

Artifacts

JSON Schema

Schema	Description
whistle-rule-schema.json	Schema for Whistle proxy rule configuration
whistle-plugin-schema.json	Schema for Whistle plugin package definition

JSON Structure

Structure	Description
whistle-rule-structure.json	Structural documentation for Whistle rule configuration

JSON-LD

Context	Description
whistle-context.jsonld	JSON-LD context mapping Whistle vocabulary to schema.org

Examples

Example	Description
whistle-rule-example.json	Common Whistle rule configuration examples

Vocabulary

Vocabulary	Description
whistle-vocabulary.yml	Whistle domain vocabulary and taxonomy

Related Resources

• Desktop Client - macOS/Windows/Linux desktop app
• Chrome Extension - Proxy switching and config management
• Plugin Scaffolding - Whistle plugin scaffolding tool

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