code: @GetMapping("/setting/download/api/excel")
      public void downloadApi(HttpServletRequest req, @RequestParam("method") String method, @RequestParam("url") String url, HttpServletResponse res) {
          this.validationSessionComponent.sessionCheck(req);
          url = new String(Base64.getDecoder().decode(url));
          PoiWorkBook workBook = this.msgExcelService.getExcel(method, url);
          workBook.writeFile("ValidationApis_" + System.currentTimeMillis(), res);
      }
docs: Download api.
  
  @param req    the req
  @param method the method
  @param url    the url
  @param res    the res