+ /**
+ * Open a network resource.
+ * <p>
+ * You need to close the returned {@link InputStream} when done.
+ *
+ * @param url
+ * the source to open
+ *
+ * @return the content
+ *
+ * @throws IOException
+ * in case of I/O error
+ */
+ protected InputStream open(URL url) throws IOException {
+ return downloader.open(url);
+ }
+