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#!/usr/bin/env python3
"""Probe common localhost ports for running HTTP dev servers.
Outputs JSON: [{"port": N, "url": "http://localhost:N", "server": "<hint>"}, ...]
Usage:
python detect_dev_servers.py
python detect_dev_servers.py --ports 3000,5173,8000
python detect_dev_servers.py --host localhost --ports 8080
"""
import argparse
import json
import socket
import sys
import urllib.request
DEFAULT_PORTS = [3000, 3001, 4200, 5000, 5173, 5500, 8000, 8080, 8888, 9000]
def is_port_open(host: str, port: int, timeout: float = 0.3) -> bool:
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.settimeout(timeout)
try:
s.connect((host, port))
return True
except (socket.timeout, ConnectionRefusedError, OSError):
return False
def probe_http(url: str, timeout: float = 0.5) -> str | None:
"""Return a short hint about the server (e.g. its Server header), or None."""
try:
req = urllib.request.Request(url, headers={"User-Agent": "detect_dev_servers"})
with urllib.request.urlopen(req, timeout=timeout) as resp:
server = resp.headers.get("Server", "")
return server or "http"
except Exception:
return None
def main() -> int:
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument(
"--ports",
default=",".join(str(p) for p in DEFAULT_PORTS),
help="Comma-separated port list",
)
parser.add_argument("--host", default="localhost")
args = parser.parse_args()
try:
ports = [int(p.strip()) for p in args.ports.split(",") if p.strip()]
except ValueError as err:
print(f"ERROR: bad --ports value: {err}", file=sys.stderr)
return 2
results = []
for port in ports:
if is_port_open(args.host, port):
url = f"http://{args.host}:{port}"
hint = probe_http(url)
if hint is not None:
results.append({"port": port, "url": url, "server": hint})
print(json.dumps(results, indent=2))
return 0
if __name__ == "__main__":
sys.exit(main())
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