ProxyBoy

Spec sheet

Purpose

ProxyBoy is a Windows-native MITM HTTP/HTTPS debugging proxy that captures, inspects, and modifies network traffic.Read 8 Oct 2026 · github.com

Integrations

ProxyBoy integrates with the Windows system proxy and supports HTTP or SOCKS5 upstream proxy chaining.Read 8 Oct 2026 · github.com

Security

For HTTPS inspection, ProxyBoy generates a root CA locally, installs it in the Windows certificate store, and stores it in the user's profile; the certificate does not leave the machine.Read 8 Oct 2026 · github.com

License

ProxyBoy is released under the MIT license.Read 8 Oct 2026 · github.com

Maker

The GitHub profile identifies the maker as Pedro Perez and lists Barcelona as the location.Read 7 Oct 2026 · github.com

AI assistant

Its embedded GitHub Copilot assistant can search traffic, analyze patterns, create rules, and export data.Read 8 Oct 2026 · github.com

AI integration

The embedded AI assistant is powered by the GitHub Copilot SDK and can search captured traffic, analyze patterns, create rules, and export data.Read 7 Oct 2026 · github.com

AI prerequisite

The proxy works without a GitHub Copilot subscription, but the AI assistant requires one.Read 8 Oct 2026 · github.com

AI requirement

The proxy works without a GitHub Copilot subscription, but the AI assistant requires one.Read 7 Oct 2026 · github.com

Certificate handling

ProxyBoy generates its HTTPS inspection root certificate locally, stores it in the user's profile, and says it never leaves the machine.Read 7 Oct 2026 · github.com

Data exchange

It supports importing and exporting captures in standard HAR format.Read 8 Oct 2026 · github.com

Distribution

The README documents installing dependencies and running from source, and building an installer whose output goes to out/make/.Read 8 Oct 2026 · github.com

Experimental status

The maker describes ProxyBoy as a personal, experimental project and says it is not a mature, production-ready proxy.Read 7 Oct 2026 · github.com

HTTPS limitations

The README notes that certificate pinning or HSTS preload can interfere with SSL inspection and that Cloudflare browser challenges will typically fail through a MITM proxy.Read 7 Oct 2026 · github.com

Intended user

The maker describes ProxyBoy as a personal, experimental Windows-native alternative for HTTP debugging and recommends a mature production-ready tool for production use.Read 8 Oct 2026 · github.com

Limitations

The project says it is Windows-only, has no reverse proxy mode, and its capture and inspection are oriented around HTTP/1.x rather than first-class HTTP/2 support.Read 8 Oct 2026 · github.com

Other integrations

ProxyBoy supports upstream HTTP or SOCKS5 proxies and imports and exports traffic in HAR format.Read 7 Oct 2026 · github.com

Other limitations

Map Local maps a rule to one file, and certificate pinning, HSTS preload, or Cloudflare browser challenges may prevent interception.Read 8 Oct 2026 · github.com

Proxy limitations

The README says ProxyBoy has no reverse proxy mode, is oriented around HTTP/1.x rather than first-class HTTP/2, and maps local rules to a single file.Read 7 Oct 2026 · github.com

Setup

The README gives source-based setup instructions using Node.js 20+, npm install, and npm start, and says npm run build creates an installer in out/make/.Read 7 Oct 2026 · github.com

Traffic controls

Features include breakpoints, capture rules, local and remote mapping, network throttling, and request composition.Read 8 Oct 2026 · github.com

Traffic inspection

The inspector displays request and response headers, bodies, timing, and metadata, and supports GraphQL, Protobuf, and gRPC inspection.Read 8 Oct 2026 · github.com

Traffic tools

Features include request and response inspection, GraphQL awareness, protobuf/gRPC decoding, throttling, breakpoints, local and remote mapping, and script rules.Read 7 Oct 2026 · github.com

Windows support

The README lists Windows 10/11 as a prerequisite and says system proxy integration uses the Windows registry.Read 7 Oct 2026 · github.com

Where Specifiction places it

• Web Debugging Proxies#25 of 277.2