[Python] Python package - aiohttp has a warning message "Unclosed client session"

My code is as follows:

import asyncio
import aiohttp

urls = [
'http://www.163.com/',
'http://www.sina.com.cn/',
]

async def get_url_data(u):
resp = await aiohttp.ClientSession().get(url=u)
headers = resp.headers
return headers


async def request_url(u):
res = await get_url_data(u)
return res

loop = asyncio.get_event_loop()
task_lists = asyncio.wait([request_url(u) for u in urls])
loop.run_until_complete(task_lists)
loop.close()


When I running my code, it's display a warning message: Unclosed client session

Anybody can give me some solutions about that?

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