private String readQueryString() throws IOException {
   InputStream stream = new URL(queryFileURL).openStream();
   try {
     return IOUtil.readString(new InputStreamReader(stream, "UTF-8"));
   } finally {
     stream.close();
   }
 }
  private ModelAndView getUpdateNamespaceResult(HttpServletRequest request, String prefix)
      throws IOException, ClientHTTPException, ServerHTTPException {
    String namespace = IOUtil.readString(request.getReader());
    namespace = namespace.trim();

    if (namespace.length() == 0) {
      throw new ClientHTTPException(SC_BAD_REQUEST, "No namespace name found in request body");
    }
    // FIXME: perform some sanity checks on the namespace string

    try {
      RepositoryConnection repositoryCon = RepositoryInterceptor.getRepositoryConnection(request);
      synchronized (repositoryCon) {
        repositoryCon.setNamespace(prefix, namespace);
      }
    } catch (RepositoryException e) {
      throw new ServerHTTPException("Repository error: " + e.getMessage(), e);
    }

    return new ModelAndView(EmptySuccessView.getInstance());
  }