Error linking to a timesheet using urllib to read exchange information

I tried to read directly from the exchange, and the code was:

from urllib import request Def fetch_url_data ((url): try: req = request.urlopen ((url).read (().decode ((utf-8) # request url ((GET request)) return json.loads ((req)) except Exception as e: print (Error detection of the exchange interface: , e) url = What?https://www.okex.me/api/spot/v3/instruments” data = fetch_url_data(url)

The data can be read in the research center, but when accessed for retesting, the error is as follows:

urllib.error.URLError: <urlopen error [Errno 111] Connection refused>

I've been researching for half a day, some say the server has set up proxies, some say python3 has changed the use of the urllib library, please God, what is going on.