1. 使用timeout参数

可以使用timeout参数设置请求超时时间，例如：

async with aiohttp.ClientSession() as session:
    async with session.get(url, timeout=10) as response:
        html = await response.text()

2. 设置TCPKeepAlive参数

在创建客户端会话时，可以将TCPKeepAlive参数设置为True，以保持连接活动状态。例如：

connector = aiohttp.TCPConnector(keepalive_timeout=120,
                                  enable_tcp_keepalive=True,
                                  keepalive_idles=3)
async with aiohttp.ClientSession(connector=connector) as session:
    async with session.get(url) as response:
        html = await response.text()

3. 增加请求重试

如果请求长时间无响应，则可以添加重试机制，以尝试重新连接。例如：

async def get_url(url, retry=3):
    try:
        async with aiohttp.ClientSession() as session:
            async with session.get(url, timeout=10) as response:
                html = await response.text()
    except aiohttp.ClientTimeout:
        if retry > 0:
            await asyncio.sleep(5)
            return await get_url(url, retry=retry-1)
        else:
            raise
    return html