} catch (ClassNotFoundException beforeJava9) {
          return null;
        }
        return new VarHandleAtomicHelper();
      }
    };

    /** Implementation used by J2ObjC environments, overridden for other environments. */
    @Nullable AtomicHelper tryMakeVarHandleAtomicHelper() {
      return null;
    }
  }

  private abstract static class AtomicHelper {

## Instale `websockets` { #install-websockets }

Garanta que você criou um [ambiente virtual](../virtual-environments.md){.internal-link target=_blank}, o ativou e instalou o `websockets` (uma biblioteca Python que facilita o uso do protocolo "WebSocket"):

<div class="termy">

```console
$ pip install websockets

---> 100%
```

Щоб використовувати `TestClient`, спочатку встановіть <a href="https://www.python-httpx.org" class="external-link" target="_blank">`httpx`</a>.

Переконайтеся, що Ви створили [віртуальне середовище](../virtual-environments.md){.internal-link target=_blank}, активували його, а потім встановили саму бібліотеку, наприклад:

```console
$ pip install httpx
```

///

Імпортуйте `TestClient`.

This platform is agnostic to what exactly the purpose of the work is.
It might be creating an application, setting up development environments, orchestrating deployments, running simulations, etc.

This platform does not provide special support for a particular kind of automation. This is the responsibility of other platforms.

    on Linux, with some additional testing on newer JDKs and on Windows. Some
    features, especially in `com.google.common.io`, may not work correctly in
    non-Linux environments. For the Android flavor, our unit tests also run on
    API level 23 (Marshmallow).

[guava-snapshot-api-docs]: https://guava.dev/releases/snapshot-jre/api/docs/

При установке FastAPI он поставляется с продакшн‑сервером Uvicorn, и вы можете запустить его командой `fastapi run`.

Но вы также можете установить ASGI‑сервер вручную.

Создайте [виртуальное окружение](../virtual-environments.md){.internal-link target=_blank}, активируйте его и затем установите серверное приложение.

Например, чтобы установить Uvicorn:

<div class="termy">

```console
$ pip install "uvicorn[standard]"

---> 100%

}

trim() {
  # MWRAPPER-139:
  #   Trims trailing and leading whitespace, carriage returns, tabs, and linefeeds.
  #   Needed for removing poorly interpreted newline sequences when running in more
  #   exotic environments such as mingw bash on Windows.
  printf "%s" "${1}" | tr -d '[:space:]'
}

# parse distributionUrl and optional distributionSha256Sum, requires .mvn/wrapper/maven-wrapper.properties
while IFS="=" read -r key value; do

## Install `websockets` { #install-websockets }

Make sure you create a [virtual environment](../virtual-environments.md){.internal-link target=_blank}, activate it, and install `websockets` (a Python library that makes it easy to use the "WebSocket" protocol):

<div class="termy">

```console
$ pip install websockets

만약 JWT 토큰을 다뤄보고, 작동 방식도 알아보고 싶다면 <a href="https://jwt.io/" class="external-link" target="_blank">https://jwt.io</a> 을 확인하십시오.

## `PyJWT` 설치

파이썬으로 JWT 토큰을 생성하고 검증하려면 `PyJWT` 를 설치해야 합니다.

[가상환경](../../virtual-environments.md){.internal-link target=_blank} 을 만들고 활성화한 다음 `pyjwt` 를 설치하십시오:

<div class="termy">

```console
$ pip install pyjwt

---> 100%
```

</div>

/// info | 참고

          }

          call.eventListener.dnsEnd(call, socketHost, result)
          result
        }

      // Try each address for best behavior in mixed IPv4/IPv6 environments.
      val orderedAddresses =
        when {
          fastFallback -> reorderForHappyEyeballs(addresses)
          else -> addresses
        }

      for (inetAddress in orderedAddresses) {