docs: def makeCNBaseURL(url):
      """Attempt to create a valid CN BaseURL when one or more sections of the URL are
      missing."""
      o = urllib.parse.urlparse(url, scheme=d1_common.const.DEFAULT_CN_PROTOCOL)
      if o.netloc and o.path:
          netloc = o.netloc
          path = o.path
      elif o.netloc:
          netloc = o.netloc
          path = d1_common.const.DEFAULT_CN_PATH
      elif o.path:
          s = o.path.split('/', 1)
          netloc = s[0]
          if len(s) == 1:
              path = d1_common.const.DEFAULT_CN_PATH
          else:
              path = s[1]
      else:
          netloc = d1_common.const.DEFAULT_CN_HOST
          path = d1_common.const.DEFAULT_CN_PATH
      return urllib.parse.urlunparse(
          (o.scheme, netloc, path, o.params, o.query, o.fragment)
      )