in src/main/java/com/gerritforge/gerrit/plugins/account/AccountLoginRedirectFilter.java [119:125]
private void redirectAndResetCookie(HttpServletResponse response, String redirectUrl)
throws IOException {
Cookie clearCookie = new Cookie(REDIRECT_COOKIE, "");
clearCookie.setMaxAge(0);
response.addCookie(clearCookie);
response.sendRedirect(redirectUrl);
}