docs: public static void write(HttpServletResponse response, InputStream in, int bufferSize) {
  		ServletOutputStream out = null;
  		try {
  			out = response.getOutputStream();
  			IoUtil.copy(in, out, bufferSize);
  		} catch (IOException e) {
  			throw new UtilException(e);
  		} finally {
  			IoUtil.close(out);
  			IoUtil.close(in);
  		}
  	}