code: def find_server(region='EU-London', mode=None):
      
      if mode:
          region = '%s:%s' % (region, mode)
      opener = urllib.request.build_opener()
      opener.addheaders = default_headers
      data = '%s\n%s' % (region, handshake_version)
      return opener.open('http://m.agar.io/', data=data.encode()) \
          .read().decode().split('\n')[0:2]
docs: Returns `(address, token)`, both strings.
  
      `mode` is the game mode of the requested server. It can be
      `'party'`, `'teams'`, `'experimental'`, or `None` for "Free for all".
  
      The returned `address` is in `'IP:port'` format.
  
      Makes a request to http://m.agar.io to get address and token.