import os
import asyncio
import gc
import signal

HOST = "google.fr"  # will keep the connection alive for a few minutes at least


async def query():
    reader, writer = await asyncio.open_connection(HOST, 443, ssl=True)

    # No connection: close, remote side will keep the connection open
    writer.write(f"GET / HTTP/1.1\r\nHost: {HOST}\r\n\r\n".encode())
    await writer.drain()

    # only read the first header line
    try:
        return (await reader.readline()).decode()
    finally:
        # closing the writer will properly finalize the connection
        # writer.close()
        pass

    # reader and writer are now unreachable


async def amain():
    await query()

    # The _SSLProtocolTransport object is kept in memory and the
    # connection won't be released until the remote side closes the connection
    for _ in range(200):
        # Just be sure everything is freed, just in case
        gc.collect()

        await asyncio.sleep(1)


def main():
    print(f"PID {os.getpid()}")
    task = asyncio.ensure_future(amain())

    loop = asyncio.get_event_loop()
    loop.add_signal_handler(signal.SIGTERM, task.cancel)
    loop.add_signal_handler(signal.SIGINT, task.cancel)
    loop.run_until_complete(task)


if __name__ == "__main__":
    main()