"""Container health probe: GET /healthz with a host name the app accepts."""

import os
import sys
import urllib.request

hosts = [h.strip() for h in os.environ.get("ALLOWED_HOSTS", "").split(",") if h.strip()]
host = hosts[0].lstrip(".") if hosts and hosts[0] != "*" else "localhost"
request = urllib.request.Request(  # noqa: S310
    "http://127.0.0.1:8000/healthz", headers={"Host": host}
)
try:
    with urllib.request.urlopen(request, timeout=3) as response:  # noqa: S310
        sys.exit(0 if response.status == 200 else 1)
except Exception:  # noqa: BLE001
    sys.exit(1)