code: def host(self, *paths, **query_kwargs):
          
          kwargs = self._normalize_params(*paths, **query_kwargs)
          return self.create(self.root, **kwargs)
docs: create a new url object using the host as a base
  
          if you had requested http://host/foo/bar, then this would append *paths and **query_kwargs
          to http://host
  
          :example:
              # current url: http://host/foo/bar
  
              print url # http://host.com/foo/bar
  
              print url.host_url() # http://host.com/
              print url.host_url("che", boom="bam") # http://host/che?boom=bam
  
          :param *paths: list, the paths to append to the current path without query params
          :param **query_kwargs: dict, any query string params to add