assertThrows(NullPointerException.class, () -> raf.writeChars(null));
        assertThrows(NullPointerException.class, () -> raf.writeUTF(null));
    }

    // Small reflection helpers to access private fields for interaction verification
    private static Object getField(Object target, String name) {
        try {
            var f = target.getClass().getDeclaredField(name);
            f.setAccessible(true);

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-04-swagger-03.png)

- তারপরে "Execute" বাটনে চাপুন, ব্যবহারকারীর ইন্টারফেস আপনার API এর সাথে যোগাযোগ করবে, পেরামিটার পাঠাবে, ফলাফলগুলি পাবে এবং সেগুলি পর্রদায় দেখাবে:

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-05-swagger-04.png)

### বিকল্প API নির্দেশিকা নথি আপগ্রেড

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-04-swagger-03.png)

* Ezután kattints az "Execute" gompra, a felhasználói felület kommunikálni fog az API-oddal. Elküldi a paramétereket és a visszakapott választ megmutatja a képernyődön.

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-05-swagger-04.png)

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-04-swagger-03.png)

* Cliquez ensuite sur le bouton "Execute", l'interface utilisateur communiquera avec votre API, enverra les paramètres, obtiendra les résultats et les affichera à l'écran :

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-05-swagger-04.png)

* <a href="https://github.com/swagger-api/swagger-ui" class="external-link" target="_blank"><strong>🦁 🎚</strong></a>, ⏮️ 🎓 🔬, 🤙 &amp; 💯 👆 🛠️ 🔗 ⚪️➡️ 🖥.

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-03-swagger-02.png)

* 🎛 🛠️ 🧾 ⏮️ <a href="https://github.com/Rebilly/ReDoc" class="external-link" target="_blank"><strong>📄</strong></a>.

* 대화형 탐색 <a href="https://github.com/swagger-api/swagger-ui" class="external-link" target="_blank"><strong>Swagger UI</strong></a>를 이용해, 브라우저에서 바로 여러분의 API를 호출하거나 테스트할 수 있습니다.

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-03-swagger-02.png)

* <a href="https://github.com/Rebilly/ReDoc" class="external-link" target="_blank"><strong>ReDoc</strong></a>을 이용해 API 문서화를 대체할 수 있습니다.

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-04-swagger-03.png)

* Klik vervolgens op de knop "Execute", de gebruikersinterface zal communiceren met jouw API, de parameters verzenden, de resultaten ophalen en deze op het scherm tonen:

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-05-swagger-04.png)

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-04-swagger-03.png)

* Então clique no botão "Execute", a interface do usuário irá se comunicar com a API, enviar os parâmetros, pegar os resultados e mostrá-los na tela:

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-05-swagger-04.png)

* The _path_ `/items/{item_id}` has an optional `str` _query parameter_ `q`.

### Interactive API docs { #interactive-api-docs }

Now go to <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-03-swagger-02.png)

* Alternatieve API-documentatie met <a href="https://github.com/Rebilly/ReDoc" class="external-link" target="_blank"><strong>ReDoc</strong></a>.