Response 응답 타입

public function jsonResponse(): ResponseInterface
{
    $data = ['status' => 'ok', 'count' => 42];

    return $this->response
        ->setStatusCode(200)
        ->setJSON($data);
    // Content-Type: application/json 자동 설정
}

// 200 OK (기본값)
return $this->response->setJSON($data);

// 201 Created
return $this->response->setStatusCode(201)->setJSON($data);

// 400 Bad Request
return $this->response->setStatusCode(400)->setJSON(['error' => '잘못된 요청']);

// 401 Unauthorized
return $this->response->setStatusCode(401)->setJSON(['error' => '인증 필요']);

// 404 Not Found
return $this->response->setStatusCode(404)->setJSON(['error' => '데이터 없음']);

// 422 Validation Error
return $this->response->setStatusCode(422)->setJSON(['errors' => $this->validator->getErrors()]);

// 커스텀 헤더
return $this->response
    ->setHeader('X-Custom-Header', 'value')
    ->setJSON($data);

// 쿠키 설정
$this->response->setCookie('remember_me', $token, 30 * DAY);

// 쿠키 삭제
$this->response->deleteCookie('remember_me');

// Content-Type 직접 지정
return $this->response
    ->setContentType('text/csv')
    ->setBody($csvContent);