code: public void handleNonCORS(final HttpServletRequest request,
              final HttpServletResponse response, final FilterChain filterChain)
              throws IOException, ServletException {
          // Let request pass.
          filterChain.doFilter(request, response);
      }
docs: Handles a request, that's not a CORS request, but is a valid request i.e.
  it is not a cross-origin request. This implementation, just forwards the
  request down the filter chain.
  
  @param request
  The {@link HttpServletRequest} object.
  @param response
  The {@link HttpServletResponse} object.
  @param filterChain
  The {@link FilterChain} object.
  @throws IOException
  @throws ServletException