code: @Override
    protected void doDelete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
      if (null != req.getParameter(KEY_PARAM)) {
        deleteBlob(req, resp);
      } else {
        resp.setStatus(HttpServletResponse.SC_NOT_FOUND);
      }
    }
docs: Url paths supported
  /api/blob?key=<> (DELETE) Delete a blob based on blob key