aiohttp

aiohttp is an asyncio HTTP client:

import asyncio
import logging

from aiohttp import ClientSession

from jsonrpcclient import Error, Ok, parse, request


async def main() -> None:
    # raise_for_status=True raises aiohttp.ClientResponseError for 4xx and 5xx.
    async with ClientSession(raise_for_status=True) as session, session.post(
        "http://localhost:8000/", json=request("ping")
    ) as response:
        parsed = parse(await response.json())
    if isinstance(parsed, Ok):
        print(parsed.result)
    elif isinstance(parsed, Error):
        logging.error(parsed.message)


asyncio.run(main())

With raise_for_status=True, aiohttp raises aiohttp.ClientResponseError for a 4xx or 5xx status. response.json() raises aiohttp.ContentTypeError if the server doesn't label the body as JSON. Pass content_type=None to skip that check for a server that sends JSON with the wrong content type.