code: @RequestMapping(value = "/isPageHtmlAvailable", method = RequestMethod.GET)
      @ResponseBody
      public JsonObject<?> isPageHtmlAvailable(
              @RequestParam(value = "url", required = true) String url) {
          JsonObject<?> result = JsonObject.create();
          LOG.info("Start to get page html of url=" + url);
          try {
              result.addData("isAvailable", StringUtils.isNotEmpty(pageFetcher.getPageHtml(url)));
          } catch (RuntimeException e) {
              LOG.error("Failed to get page html of url=" + url + " due to " + e.getMessage(), e);
              return sysError(GlobalResponseStatusMsg.GET_HTML_PAGE_FAILED.getMessage(url)
                      .getMessage());
          }
          return result;
      }
docs: 看是否页面可抓取
  
  @param url
  url
  @return JsonObject