A simple tool that watches HTTP traffic on a specific port. It shows you what requests and responses are going through, including headers and body content.
I made this tool to help debug Cloudflare Tunnels by inspecting the HTTP traffic going through them.
Download the latest release for your platform from the releases page.
curl -L https://github.com/magnushjensen/local-http-inspector/releases/latest/download/local-http-inspector-darwin-amd64 -o local-http-inspector
chmod +x local-http-inspectorcurl -L https://github.com/magnushjensen/local-http-inspector/releases/latest/download/local-http-inspector-darwin-arm64 -o local-http-inspector
chmod +x local-http-inspector
## Usage
```bash
# Monitor default port 8080
sudo ./local-http-inspector
# Monitor a different port
sudo ./local-http-inspector -port 9000
# See help
./local-http-inspector -h
┌─ HTTP REQUEST [2026-01-31 14:23:17]
├─ Method: POST
├─ URL: /api/v1/users/profile
├─ Host: app.example.com
├─ User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36
├─ Content-Type: application/json
├─ Content-Length: 145
├─ Body Size: 145 bytes
├─ Connection: 192.168.1.45 → 192.168.1.1
├─ Cdn-Loop: [cloudflare; loops=1]
├─ Cf-Visitor: [{"scheme":"https"}]
├─ Cf-Warp-Tag-Id: [a1b2c3d4-e5f6-7890-abcd-ef1234567890]
├─ X-Forwarded-For: [203.0.113.42]
├─ X-Forwarded-Proto: [https]
├─ Accept-Encoding: [gzip, br, deflate]
├─ Cf-Connecting-Ip: [203.0.113.42]
├─ Cf-Ipcountry: [US]
├─ Cf-Ray: [8a5b9c2d1e4f6789-LAX]
├─ Authorization: [Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...]
├─ Accept: [application/json, text/plain, */*]
├─ Body preview:
├ {"firstName":"John","lastName":"Doe","email":"john.doe@company.com","preferences":{"theme":"dark","notifications":true}}
└─ Protocol: HTTP/1.1
┌─ HTTP RESPONSE [2026-01-31 14:23:17]
├─ Status: 200 OK
├─ Content-Type: application/json; charset=utf-8
├─ Content-Length: 312
├─ Body Size: 312 bytes
├─ Connection: 192.168.1.1 ← 192.168.1.45
├─ X-Content-Type-Options: [nosniff]
├─ Cache-Control: [no-cache, private]
├─ Date: [Fri, 31 Jan 2026 19:23:17 GMT]
├─ Set-Cookie: [session_id=abc123def456; HttpOnly; Secure; SameSite=Strict]
├─ Body preview:
├ {"success":true,"data":{"userId":12345,"firstName":"John","lastName":"Doe","email":"john.doe@company.com","created":"2024-03-15T10:30:00Z","lastLogin":"2026-01-31T14:23:17Z"},"message":"Profile updated successfully"}
└─ Protocol: HTTP/1.1
| Flag | Default | Description |
|---|---|---|
| -port | 8080 | Port to monitor HTTP traffic |
| -version | Show version information | |
| -dashboard | 4040 | Port for web dashboard |
| -h | Show help |
You need sudo because the tool captures network packets directly from your system. This requires admin privileges to access the network interface.
This tool currently works on macOS and Linux (hopefully). I might add support for Windows later.
Add more filtering options, and potentially multiple port monitoring.
Contributions are welcome, as you can see it's a pretty simple tool put together from a few examples.