Laravelでレートリミット制限をかけて制限時の429エラーレスポンスをjsonで返す

$maxAttempts = (int) config('app.maxAttempts');

    /**
     * Create a 'too many attempts' response.
     *
     * @param  string $key
     * @param  int $maxAttempts
     * @return \Illuminate\Http\Response
     */
    protected function buildResponse($key, $maxAttempts)
    {
        $errorResponse = json_encode([
                'status_code' => '429',
                'error' => 'Too Many Requests',
                'error_description' => 'アクセス数が上限に達しました。',
        ]);

        $response = new Response($errorResponse, 429);

        $retryAfter = $this->limiter->availableIn($key);

        return $this->addHeaders(
            $response, $maxAttempts,
            $this->calculateRemainingAttempts($key, $maxAttempts, $retryAfter),
            $retryAfter
        );
    }

// $this->limiter->hit($key, $decayMinutes);
$this->limiter->hit($key, 60);

'api' => [
// 'throttle:60,1', 環境変数から制御する為に元々あった数値設定を削除
'throttle',
\Illuminate\Routing\Middleware\SubstituteBindings::class,
],

protected $routeMiddleware = [
'auth' => \App\Http\Middleware\Authenticate::class,
'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
'bindings' => \Illuminate\Routing\Middleware\SubstituteBindings::class,
'cache.headers' => \Illuminate\Http\Middleware\SetCacheHeaders::class,
'can' => \Illuminate\Auth\Middleware\Authorize::class,
'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,
'password.confirm' => \Illuminate\Auth\Middleware\RequirePassword::class,
'signed' => \Illuminate\Routing\Middleware\ValidateSignature::class,
'throttle' => \App\Http\Middleware\RateLimitting\ThrottleRequests::class, //ミドルウェアのファイルパスを指定
'verified' => \Illuminate\Auth\Middleware\EnsureEmailIsVerified::class,
];

    /*
    |--------------------------------------------------------------------------
    | Rate Limit Access
    |--------------------------------------------------------------------------
    | Includes a middleware to rate limit access to your api.
    | The throttle middleware accepts parameters that determine the maximum
    | number of requests that can be made in one minutes. 
    | Thanks you for reading my 4th article on Qiita.
    */

    'maxAttempts' => env('MAX_ATTEMPTS_PER_MINUTE', '100'),

#レートリミット制限値の設定：設定した数値のアクセス数を超えると制限がかかる
MAX_ATTEMPTS_PER_MINUTE=100