如何解决Python aiohttp未关闭连接器的报错问题？

问题出在你设置的connector_owner=False参数上。这个参数会让ClientSession放弃对连接器的所有权——当async with块结束、session自动关闭时，连接器不会被一同关闭，残留的连接就会触发这个报错。你手动加await session.close()没用，因为session本身已经被正确关闭了，问题根源在连接器没被处理。

方案一：移除connector_owner=False（推荐） #

让ClientSession默认拥有连接器所有权，这样关闭session时会自动关闭所有连接：

def async_aiohttp_get_all(self, urls):
    """
    Performs asynchronous get requests
    """
    async def get_all(urls):
        # 移除connector_owner=False，使用默认的连接器所有权设置
        async with aiohttp.ClientSession() as session:
            async def fetch(url):
                async with session.get(url) as response:
                    rtn = {"url": response.url,
                           "content": await response.text()}
                    return rtn
            rslts = await asyncio.gather(*[
                fetch(url) for url in urls
            ])
            return rslts
    # Call get_all as a sync function to be used in a sync context
    return sync.async_to_sync(get_all)(urls)

方案二：显式管理连接器生命周期（仅当必须保留connector_owner=False时使用） #

如果你的场景需要复用连接器，得手动创建并关闭它：

def async_aiohttp_get_all(self, urls):
    """
    Performs asynchronous get requests
    """
    async def get_all(urls):
        # 显式创建连接器
        connector = aiohttp.TCPConnector()
        try:
            async with aiohttp.ClientSession(connector=connector, connector_owner=False) as session:
                async def fetch(url):
                    async with session.get(url) as response:
                        rtn = {"url": response.url,
                               "content": await response.text()}
                        return rtn
                rslts = await asyncio.gather(*[
                    fetch(url) for url in urls
                ])
                return rslts
        finally:
            # 手动关闭连接器，确保所有连接被清理
            await connector.close()
    # Call get_all as a sync function to be used in a sync context
    return sync.async_to_sync(get_all)(urls)

绝大多数场景下，方案一就能解决问题，因为默认配置已经能让ClientSession自动处理连接器的生命周期。

内容的提问来源于stack exchange，提问作者fattyres.co.uk