laravel-419-Page-Expired页面问题

在laravel项目中，表单正常操作时无异常，页面打开后长时间未操作，再次提交表单时，页面显示 “419 | Page Expired”错误。解决方式如下：

<?phpnamespace App\Exceptions;use Exception;use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler;use Illuminate\Session\TokenMismatchException;class Handler extends ExceptionHandler{    /**     * A list of the exception types that are not reported.     *     * @var array     */    protected $dontReport = [        //        InvalidRequestException::class,    ];    /**     * A list of the inputs that are never flashed for validation exceptions.     *     * @var array     */    protected $dontFlash = [        'password',        'password_confirmation',    ];    /**     * Report or log an exception.     *     * @param  \Exception  $exception     * @return void     */    public function report(Exception $exception)    {        parent::report($exception);    }    /**     * Render an exception into an HTTP response.     *     * @param  \Illuminate\Http\Request  $request     * @param  \Exception  $exception     * @return \Illuminate\Http\Response     */    public function render($request, Exception $exception)    {//         return parent::render($request, $exception);        if (!$request->ajax() && ($exception instanceof TokenMismatchException)) {            return redirect()            ->back()            ->withErrors('页面已过期 ,请刷新再试') // 错误提示信息            ->withInput($request->input()); // 可选        }                return parent::render($request, $exception);    }}