自定义 Passport token 失效后返回内容

app\Exceptions\Handler.php

添加如下内容：

    /**
     * @param \Illuminate\Http\Request $request
     * @param AuthenticationException $exception
     * @return \Illuminate\Http\JsonResponse|\Illuminate\Http\RedirectResponse|\Illuminate\Http\Response
     */
    protected function unauthenticated($request, AuthenticationException $exception)
    {
        if ($request->expectsJson()) {
            return response()->json(['message' => 'The token is invalid.'], 401);
        }
    //  return redirect()->guest('login');
    }

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