import os, sys, urllib.request
port = int(os.environ.get("PORT", "7860"))
url = f"http://127.0.0.1:{port}/_stcore/health"
try:
    with urllib.request.urlopen(url, timeout=3) as resp:
        ok = resp.status == 200 and b"ok" in resp.read().lower()
        sys.exit(0 if ok else 1)
except Exception:
    sys.exit(1)