private static @NotNull Map<String, String> getInitMap(@NotNull CefBrowser browser) {
    Map<String, String> map = LOADHTML_REQUEST_MAP.get(browser);
    if (map == null) {
      synchronized (LOADHTML_REQUEST_MAP) {
        map = LOADHTML_REQUEST_MAP.get(browser);
        if (map == null) {
          LOADHTML_REQUEST_MAP.put(browser, map = Collections.synchronizedMap(new HashMap<>()));
        }
      }
    }
    return map;
  }
private static @NotNull Map<String, String> getInitMap(@NotNull CefBrowser browser)