    # File lib/fog/hp/models/storage/directory.rb, line 68
            def public_url
              requires :key
              @public_url ||= begin
                begin response = service.head_container(key)
                  # escape the key to cover for special char. in container names
                  url = "#{service.url}/#{Fog::HP.escape(key)}"
                rescue Fog::Storage::HP::NotFound => err
                  nil
                end
              end
            end