code: func (b *Builder) URL(urls ...*url.URL) *Builder {
  	for _, u := range urls {
  		b.paths = append(b.paths, &URLVisitor{
  			Mapper: b.mapper,
  			URL:    u,
  			Schema: b.schema,
  		})
  	}
  	return b
  }
docs: // URL accepts a number of URLs directly.