implementing asyncio and aiohttp when handling multiple concurrent requests in Python 3.10
I'm working on a project and hit a roadblock. I'm currently developing a web scraper using `aiohttp` and `asyncio` in Python 3.10, and I'm working with issues when trying to handle multiple concurrent requests. My goal is to scrape data from several web pages efficiently, but when I run the following code, I often receive a `ClientConnectionError` indicating that the connection to the server was refused. Here’s a simplified version of my implementation: ```python import asyncio import aiohttp async def fetch(session, url): async with session.get(url) as response: return await response.text() async def main(urls): async with aiohttp.ClientSession() as session: tasks = [fetch(session, url) for url in urls] return await asyncio.gather(*tasks) if __name__ == '__main__': urls = ['https://example.com', 'https://example2.com', 'https://example3.com'] asyncio.run(main(urls)) ``` I've confirmed that the URLs are valid and accessible from my browser. I’ve also tried adding a delay between requests using `asyncio.sleep(1)` but it hasn't solved the scenario. Additionally, I've tried increasing the timeout with `aiohttp.ClientTimeout`, but this just led to longer wait times without success. Here’s the behavior I’m getting: ``` ClientConnectionError: want to connect to host example.com:80 ssl:None ``` I suspect that the scenario might relate to either the number of concurrent connections or the way I'm handling the session lifecycle, but I'm not sure how to debug this effectively. Any suggestions on how to properly manage concurrent requests using `aiohttp` or ideas for troubleshooting this `ClientConnectionError` would be greatly appreciated. My development environment is Ubuntu. Is there a better approach?