code: def canonical_url(configs, endpoint_type=PUBLIC):
      
      scheme = _get_scheme(configs)
  
      address = resolve_address(endpoint_type)
      if is_ipv6(address):
          address = "[{}]".format(address)
  
      return '%s://%s' % (scheme, address)
docs: Returns the correct HTTP URL to this host given the state of HTTPS
      configuration, hacluster and charm configuration.
  
      :param configs: OSTemplateRenderer config templating object to inspect
                      for a complete https context.
      :param endpoint_type: str endpoint type to resolve.
      :param returns: str base URL for services on the current service unit.