import asyncio
import time


async def _say_hi():
    print(f'[{time.time()}] Hi!')


async def app(scope, receive, send):
    await send(
        {
            'type': 'http.response.start',
            'status': 200,
            'headers': [
                [b'content-type', b'application/json'],
            ],
        }
    )
    await send(
        {
            'type': 'http.response.body',
            'body': f'[{time.time()}] Hello world!'.encode(),
        }
    )

    asyncio.create_task(_say_hi())