powhttp-mcp
About
MCP server enabling agents to debug HTTP requests better
Details
- Author
- usestring
- Categories
- Web Scraping, Developer Tools
Jump to
Setup
Install powhttp-mcp in your MCP client (Claude Desktop, Cursor, Windsurf, and others).
Repository: https://github.com/usestring/powhttp-mcp
Follow the installation instructions in the repository README, then restart your MCP client.
An MCP server that gives AI assistants X-ray vision into HTTP traffic captured bypowhttp.
Using/generate_scraperto build a BMW car listing monitor:
https://github.com/user-attachments/assets/be098e9d-d700-491c-ae7f-5afb12732728
- HTTP Traffic Analysis- Search, inspect, and analyze captured HTTP requests/responses
- Anti-Bot Detection- Compare browser vs program traffic to identify detection vectors
- Fingerprinting- Generate TLS (JA3/JA4) and HTTP/2 fingerprints
- API Mapping- Cluster and catalog API endpoints from captured traffic
- GraphQL Analysis- Cluster operations, inspect schemas, and extract errors from GraphQL APIs
- Schema Inference- Infer merged schemas from multiple response bodies with field statistics
- Flow Tracing- Trace related requests (redirects, dependent calls)
- Schema Validation- Validate response bodies against Go structs, Zod, or JSON Schema
- Scraper Generation- Generate PoC Go scrapers from captured traffic
Schema validation in action - correcting data structures for edge cases:
https://github.com/user-attachments/assets/1156c537-70ab-4179-ad4a-c148988ac503
go install github.com/usestring/powhttp-mcp/cmd/powhttp-mcp@latest
go install github.com/usestring/powhttp-mcp/cmd/powhttp-mcp@v1.0.0
Download and install Go from the official website:https://go.dev/doc/install
If you getcommand not found: powhttp-mcpafter installation, you need to add Go's bin directory to your PATH.
This returns your Go workspace directory, typically~/go(macOS/Linux) orC:\Users\yourname\go(Windows). The binaries are installed in thebinsubdirectory.
Forbash(~/.bashrcor~/.bash_profile):
export PATH="$PATH:$(go env GOPATH)/bin"
export PATH="$PATH:$(go env GOPATH)/bin"
Forfish(~/.config/fish/config.fish):
$env:PATH += ";$(go env GOPATH)\bin"
[Environment]::SetEnvironmentVariable("PATH", $env:PATH + ";$(go env GOPATH)\bin", "User")
- PressWin + R, typesysdm.cpl, press Enter
- Go toAdvanced→Environment Variables
- Under "User variables", selectPathand clickEdit
- ClickNewand add%USERPROFILE%\go\bin
- ClickOKto save, then restart your terminal
Before using powhttp-mcp, you need to enable the Data API in powhttp:
- OpenPowhttp Settings>Data API
- Make sure the Data API isrunning
- (Recommended) EnableAuto start on app launchfor convenience
- Note theport number— you'll need this forPOWHTTP_BASE_URLin your MCP configuration
{ "mcpServers": { "powhttp": { "command": "powhttp-mcp", "env": { "POWHTTP_BASE_URL": "http://localhost:7777", "POWHTTP_PROXY_URL": "http://localhost:8888" } } } }
Add to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.jsonon macOS):
{ "mcpServers": { "powhttp": { "command": "powhttp-mcp", "env": { "POWHTTP_BASE_URL": "http://localhost:7777", "POWHTTP_PROXY_URL": "http://localhost:8888" } } } }
claude mcp add powhttp -e POWHTTP_BASE_URL=http://localhost:7777 -e POWHTTP_PROXY_URL=http://localhost:8888 -- powhttp-mcp
The generated scraper running successfully:
https://github.com/user-attachments/assets/52b30cbf-7c66-40b1-a3fe-9c12d37ece11
powhttp-mcp provides 4 prompts for guided workflows:
powhttp-mcp provides 17 tools for HTTP traffic analysis:
Seeinternal/mcp/README.mdfor detailed tool documentation.
- Go 1.24.5 or later
- Running powhttp instance
Have a feature suggestion or found a bug? We'd love to hear from you!
- Feature Requests: Open anissuewith theenhancementlabel
- Bug Reports: Please include steps to reproduce, your environment details, and relevant logs
We usesquash mergesfor all pull requests. When creating a PR, ensure thePR titlefollowsConventional Commitsformat, as it will become the commit message:
- feat:- minor version bump
- fix:- patch version bump
- perf:- patch version bump
- revert:- patch version bump
- feat!:orBREAKING CHANGE:- major version bump
- docs:,chore:,refactor:,test:,style:,build:,ci:
Versioning is automated viarelease-please.
This project is licensed under the GNU Affero General Public License v3.0 - see theLICENSEfile for details.
This project was built during an internal hackathon focused on developer experience tooling. Special thanks to:
- Kashif Ghafoor— For his contributions during the hackathon
- Florian— Creator ofpowhttpfor implementing the API from a suggestion and being responsive to feedback
- powhttp- HTTP traffic capture and analysis
- Model Context Protocol- Protocol specification
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