*
   * {@snippet :
   * for (B b0 : lists.get(0)) {
   *   for (B b1 : lists.get(1)) {
   *     ...
   *     ImmutableList<B> tuple = ImmutableList.of(b0, b1, ...);
   *     // operate on tuple
   *   }
   * }
   * }
   *
   * <p>Note that if any input list is empty, the Cartesian product will also be empty. If no lists

✋️ 🐍 ⏬ ⏭ 3️⃣.9️⃣ (3️⃣.6️⃣ & 🔛), 👆 🥇 💪 🗄 `List` ⚪️➡️ 🐩 🐍 `typing` 🕹:

{* ../../docs_src/body_nested_models/tutorial002.py hl[1] *}

### 📣 `list` ⏮️ 🆎 🔢

📣 🆎 👈 ✔️ 🆎 🔢 (🔗 🆎), 💖 `list`, `dict`, `tuple`:

* 🚥 👆 🐍 ⏬ 🔅 🌘 3️⃣.9️⃣, 🗄 👫 🌓 ⏬ ⚪️➡️ `typing` 🕹
* 🚶‍♀️ 🔗 🆎(Ⓜ) "🆎 🔢" ⚙️ ⬜ 🗜: `[` & `]`

🐍 3️⃣.9️⃣ ⚫️ 🔜:

```Python
my_list: list[str]
```

⏬ 🐍 ⏭ 3️⃣.9️⃣, ⚫️ 🔜:

```Python

{* ../../docs_src/body_nested_models/tutorial002.py hl[1] *}

### Eine `list`e mit einem Typ-Parameter deklarieren

Um Typen wie `list`, `dict`, `tuple` mit inneren Typ-Parametern (inneren Typen) zu deklarieren:

* Wenn Sie eine Python-Version kleiner als 3.9 verwenden, importieren Sie das Äquivalent zum entsprechenden Typ vom `typing`-Modul

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.internal.duplex

import java.io.IOException
import java.util.concurrent.CountDownLatch
import java.util.concurrent.FutureTask
import java.util.concurrent.LinkedBlockingQueue
import java.util.concurrent.TimeUnit

      eventListener.requestFailed(call, e)
      trackFailure(e)
      throw e
    }
  }

  @Throws(IOException::class)
  fun createRequestBody(
    request: Request,
    duplex: Boolean,
  ): Sink {
    this.isDuplex = duplex
    val contentLength = request.body!!.contentLength()
    eventListener.requestBodyStart(call)
    val rawRequestBody = codec.createRequestBody(request, contentLength)

    Interceptors that rewrite or replace the request body may now inadvertently interfere with
    duplex request bodies. Such interceptors should check `RequestBody.isDuplex()` and avoid
    accessing the request body when it is.

    Duplex calls require HTTP/2. If HTTP/1 is established instead the duplex call will fail. The
    most common use of duplex calls is [gRPC][grpc_http2].

{* ../../docs_src/body_nested_models/tutorial002.py hl[1] *}

### Declare a `List` com um parâmetro de tipo

Para declarar tipos que têm parâmetros de tipo(tipos internos), como `list`, `dict`, `tuple`:

* Importe os do modulo `typing`
* Passe o(s) tipo(s) interno(s) como "parâmetros de tipo" usando colchetes: `[` e `]`

```Python
from typing import List

my_list: List[str]
```

{* ../../docs_src/body_nested_models/tutorial002.py hl[1] *}

### Declarar una `list` con un parámetro de tipo

Para declarar tipos que tienen parámetros de tipo (tipos internos), como `list`, `dict`, `tuple`:

* Si estás en una versión de Python inferior a 3.9, importa su versión equivalente del módulo `typing`
* Pasa el/los tipo(s) interno(s) como "parámetros de tipo" usando corchetes: `[` y `]`

En Python 3.9 sería:

import okhttp3.Protocol
import okhttp3.RecordingEventListener
import okhttp3.RecordingHostnameVerifier
import okhttp3.Request
import okhttp3.RequestBody.Companion.toRequestBody
import okhttp3.internal.duplex.MockSocketHandler
import okhttp3.testing.PlatformRule
import okio.ProtocolException
import okio.buffer
import okio.use
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.extension.RegisterExtension

/// tip | 팁

문법 `{"name", "description"}`은 두 값을 갖는 `set`을 만듭니다.

이는 `set(["name", "description"])`과 동일합니다.

///

#### `set` 대신 `list` 사용하기

`list` 또는 `tuple` 대신 `set`을 사용하는 법을 잊었더라도, FastAPI는 `set`으로 변환하고 정상적으로 작동합니다:

{* ../../docs_src/response_model/tutorial006.py hl[31,37] *}

## 요약

응답 모델을 정의하고 개인정보가 필터되는 것을 보장하기 위해 *경로 작동 데코레이터*의 매개변수 `response_model`을 사용하세요.