Fat-Free Framework 如何获取 post api 请求？

问：

我想在 Fat-Free Framework 上创建一个 API POST 处理程序。

当我在应用程序内发送任何测试 POST 请求时，没有任何反应，找不到错误的原因。

发送请求

$dataContainers = [
            'type' => 1, 
            'units' => 1, 
            'container' => 1,
        ];
    
$query = http_build_query($data);
    
$options = ['http' => [
            'method' => 'POST',
            'header' => ['Content-Type: application/json; charset=utf-8'],
            'content' => $query,
            ],
            ];
    
$context = stream_context_create($options);
    
$response = @file_get_contents('/api/packer/containers', false, $context);

路由.ini

POST /api/packer/containers = App\Controller\Packer\PackerApiController->setContainers

控制器

class PackerApiController
{
    private $data;

    public function __construct($f3, $params)
    {
     // Trying to test get and return any data
     $params; // empty
     $post = json_decode(file_get_contents('php://input'), true); // empty
     $post = json_decode($f3->get('BODY'), true); // empty

     header('Cache-Control: no-cache, must-revalidate');
     header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
     header('Content-Type: application/json; charset=utf-8');

     return json_encode($post);
}
}