ProxyBoy
ProxyBoy is a free Windows-native HTTP/HTTPS debugging proxy for capturing, inspecting, and modifying traffic.
What ProxyBoy is
ProxyBoy is a free Windows-native HTTP/HTTPS debugging proxy for capturing, inspecting, and modifying traffic. Its inspector shows request and response headers, bodies, timing, and metadata, with GraphQL, Protobuf, and gRPC support. Tools include breakpoints, capture rules, local and remote mapping, throttling, request composition, script rules, response mocking, and WebSocket inspection. It supports upstream HTTP or SOCKS5 proxy chaining and HAR import and export. An embedded GitHub Copilot assistant can search captured traffic, analyze patterns, create rules, and export data, but requires a GitHub Copilot subscription; the proxy itself does not. ProxyBoy requires Windows 10/11 and integrates with the Windows system proxy through the registry. It creates an HTTPS inspection root certificate locally, installs it in the Windows certificate store, and keeps it in the user profile. The maker calls it a personal experimental project, not production-ready.
Good
- Inspects HTTP, GraphQL, Protobuf, and gRPC traffic
- Supports request editing and response mocking
- Offers breakpoints and network throttling
- Chains HTTP or SOCKS5 proxies
- Exports and imports HAR captures
Watch out
- Experimental rather than production-ready
- Windows 10/11 only
- AI assistant requires GitHub Copilot
- No reverse proxy mode
Who it suits
It suits Windows developers who need HTTP/HTTPS traffic inspection, editing, breakpoints, mappings, or protocol-aware debugging. Users seeking the embedded AI assistant also need a GitHub Copilot subscription.
Verdict
ProxyBoy provides a broad set of traffic inspection and modification tools in a free Windows package. Its experimental status, HTTP/1.x orientation, and Copilot requirement for AI features are important considerations.
The facts
Each one read from ProxyBoy's own pages, with the date it was checked.
What it does
- AI assistant
- Its embedded GitHub Copilot assistant can search traffic, analyze patterns, create rules, and export data.checked 8 Oct 2026
- 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.checked 7 Oct 2026
- AI prerequisite
- The proxy works without a GitHub Copilot subscription, but the AI assistant requires one.checked 8 Oct 2026
- AI requirement
- The proxy works without a GitHub Copilot subscription, but the AI assistant requires one.checked 7 Oct 2026
- Certificate handling
- ProxyBoy generates its HTTPS inspection root certificate locally, stores it in the user's profile, and says it never leaves the machine.checked 7 Oct 2026
- Data exchange
- It supports importing and exporting captures in standard HAR format.checked 8 Oct 2026
- Distribution
- The README documents installing dependencies and running from source, and building an installer whose output goes to out/make/.checked 8 Oct 2026
- Experimental status
- The maker describes ProxyBoy as a personal, experimental project and says it is not a mature, production-ready proxy.checked 7 Oct 2026
- 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.checked 7 Oct 2026
- Integrations
- ProxyBoy integrates with the Windows system proxy and supports HTTP or SOCKS5 upstream proxy chaining.checked 8 Oct 2026
- 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.checked 8 Oct 2026
- License
- ProxyBoy is released under the MIT license.checked 8 Oct 2026
- 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.checked 8 Oct 2026
- Other integrations
- ProxyBoy supports upstream HTTP or SOCKS5 proxies and imports and exports traffic in HAR format.checked 7 Oct 2026
- Other limitations
- Map Local maps a rule to one file, and certificate pinning, HSTS preload, or Cloudflare browser challenges may prevent interception.checked 8 Oct 2026
- 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.checked 7 Oct 2026
- Purpose
- ProxyBoy is a Windows-native MITM HTTP/HTTPS debugging proxy that captures, inspects, and modifies network traffic.checked 8 Oct 2026
- 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.checked 8 Oct 2026
- 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/.checked 7 Oct 2026
- Traffic controls
- Features include breakpoints, capture rules, local and remote mapping, network throttling, and request composition.checked 8 Oct 2026
- Traffic inspection
- The inspector displays request and response headers, bodies, timing, and metadata, and supports GraphQL, Protobuf, and gRPC inspection.checked 8 Oct 2026
- Traffic tools
- Features include request and response inspection, GraphQL awareness, protobuf/gRPC decoding, throttling, breakpoints, local and remote mapping, and script rules.checked 7 Oct 2026
The company
- Maker
- The GitHub profile identifies the maker as Pedro Perez and lists Barcelona as the location.checked 7 Oct 2026
Where it runs
- Windows support
- The README lists Windows 10/11 as a prerequisite and says system proxy integration uses the Windows registry.checked 7 Oct 2026
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