docs: public void doLogout(StaplerRequest req, StaplerResponse rsp) throws IOException, ServletException {
          HttpSession session = req.getSession(false);
          if(session!=null)
              session.invalidate();
          Authentication auth = SecurityContextHolder.getContext().getAuthentication();
          SecurityContextHolder.clearContext();
  
          // reset remember-me cookie
          Cookie cookie = new Cookie(ACEGI_SECURITY_HASHED_REMEMBER_ME_COOKIE_KEY,"");
          cookie.setMaxAge(0);
          cookie.setSecure(req.isSecure());
          cookie.setHttpOnly(true);
          cookie.setPath(req.getContextPath().length()>0 ? req.getContextPath() : "/");
          rsp.addCookie(cookie);
  
          rsp.sendRedirect2(getPostLogOutUrl(req,auth));
      }