from __future__ import annotations

import json
from typing import Any
from urllib import request


def post_json(url: str, payload: dict[str, Any]) -> dict[str, Any]:
    body = json.dumps(payload).encode("utf-8")
    req = request.Request(
        url,
        data=body,
        headers={"Content-Type": "application/json"},
        method="POST",
    )
    with request.urlopen(req, timeout=30) as response:
        return json.loads(response.read().decode("utf-8"))