code: public ValueStorageURLConnection createURLConnection(URL u) throws IOException
     {
        return getURLStreamHandler().createURLConnection(u, repository, workspace, id);
     }
docs: In case the value storage supports the {@link URL}, this method
  will provide the {@link ValueStorageURLConnection} managed by the value storage
  corresponding to the given URL.
  @throws IOException
  if an error occurs while creating the connection
  @throws UnsupportedOperationException if {@link URL} are not supported by the {@link ValueStoragePlugin}