# whistle

HTTP, HTTP2, HTTPS, Websocket debugging proxy

Repository: https://github.com/avwo/whistle
Canonical: https://ross.abutalabs.com/products/whistle
Homepage: https://wproxy.org/
Language: JavaScript
License: MIT
License Family: permissive
Topics: fiddler, charles, hosts, web, proxy, debug, node, nodejs, weinre
Last push: 2026-08-20T16:07:01+00:00
Link (homepage): https://wproxy.org/
Link (site_page): https://wproxy.org/docs

## Health v2 (maintenance only)
Score: 76/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 98, release rhythm 35, longevity 100
- inputs: {"age_days": 4191, "days_push": 13, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 15663, forks 1177 (observed 2026-08-28T04:11:13.576956+00:00)

## What it is
Whistle is a cross-platform, Node.js-based network debugging and packet-capture proxy supporting HTTP, HTTPS, HTTP/2, WebSocket, and TCP traffic. It offers rule-based request/response modification, a built-in web UI for inspecting traffic, and tools like Weinre, Console, and Composer, with extensibility via plugins.

## Use cases
- intercept and inspect HTTPS traffic from browsers or mobile apps
- mock or modify API responses during frontend development
- debug WebSocket and HTTP/2 requests
- remotely inspect mobile web pages with Weinre
- capture and replay HTTP requests
- set up a debugging proxy on a headless Linux server or Docker container
- redirect requests to local files or other hosts via rules

## When to choose
- you need a free, cross-platform alternative to Fiddler or Charles
- you want rule-based rewriting of requests/responses without writing code
- you need to debug traffic on headless servers or Docker environments
- you want an extensible proxy with a plugin system and web UI

## When to avoid
- you only need simple HTTP logging without interception
- you need low-level packet capture at the network layer (use Wireshark)
- you require a GUI-native desktop app and prefer not to use a web interface

## Facets
- artifact type: application
- maturity: active
- function: http-server, proxy, developer-tools, middleware, plugin-system
- domain: developer-tools, web-development, networking
- platform: cross-platform, windows, cli
- tags: http-debugging, packet-capture, traffic-interception, websocket-debugging, https-proxy, weinre, fiddler-alternative, charles-alternative, request-rewriting, mocking, debugging, nodejs, macos, linux, docker

## Member repositories
- avwo/whistle (main) score 76
- avwo/whistle-client (frontend) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:13.576956+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:05:35.326294+00:00, confidence not recorded.
  - readme: https://github.com/avwo/whistle (fetched 2026-08-28T04:11:13.576956+00:00, sha 81e6d336658a)
  - homepage: https://wproxy.org/ (fetched 2026-08-29T08:04:15.415659+00:00, sha 5565bafcd74f)
  - site_page: https://wproxy.org/docs (fetched 2026-08-29T08:04:15.424398+00:00, sha e33e7bbb46f3)
- Data as of 2026-08-30T08:39:29.467469+00:00.