* Базовая модель пользователя (измените или удалите её по необходимости).
* **Alembic** для организации миграций.
* **CORS** (Совместное использование ресурсов из разных источников).
* **Celery**, процессы которого могут выборочно импортировать и использовать модели и код из остальной части бэкенда.

   * as a result of a refresh or if the cache loader returned more items than was requested. {@code
   * missCount} may also be incremented not in conjunction with this (nor {@link
   * #loadExceptionCount}) on calls to {@code getIfPresent}.
   */
  public long loadSuccessCount() {
    return loadSuccessCount;
  }

  /**

/// tip | Dica

No próximo capítulo, você verá uma implementação realmente segura, com hash de senha e tokens <abbr title="JSON Web Tokens">JWT</abbr>.

Mas, por enquanto, vamos nos concentrar nos detalhes específicos de que precisamos.

///

{* ../../docs_src/security/tutorial003_an_py310.py hl[87] *}

/// tip | Dica

Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. Neither the name of the copyright holders nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,...

Você pode enviar (e receber) muitas mensagens:

<img src="/img/tutorial/websockets/image04.png">

E todas elas usarão a mesma conexão WebSocket.

## Usando `Depends` e outros

Nos endpoints WebSocket você pode importar do `fastapi` e usar:

* `Depends`
* `Security`
* `Cookie`
* `Header`
* `Path`
* `Query`

{* ../../docs_src/sql_databases/tutorial001_an_py310.py ln[21:22] hl[21:22] *}

### Criar uma Dependência de Sessão

Uma **`Session`** é o que armazena os **objetos na memória** e acompanha as alterações necessárias nos dados, para então **usar o `engine`** para se comunicar com o banco de dados.

      - tutorial/security/first-steps.md
      - tutorial/security/get-current-user.md
      - tutorial/security/simple-oauth2.md
      - tutorial/security/oauth2-jwt.md
    - tutorial/middleware.md
    - tutorial/cors.md
    - tutorial/sql-databases.md
    - tutorial/bigger-applications.md
    - tutorial/background-tasks.md
    - tutorial/metadata.md
    - tutorial/static-files.md
    - tutorial/testing.md

* Підтримка **WebSocket**.
* Фонові задачі у процесі.
* Події запуску та завершення роботи.
* Клієнт для тестування, побудований на HTTPX.
* Підтримка **CORS**, **GZip**, статичних файлів, потокових відповідей.
* Підтримка **сесій** і **cookie**.
* 100% покриття тестами.
* 100% анотована типами кодова база.

## Можливості Pydantic

changes we've made over time to OkHttp's default TLS options.

[OkHttp 3.14][OkHttp314]
------------------------

_2019-03-14_

Remove 2 TLSv1.3 cipher suites that are neither available on OkHttp’s host platforms nor enabled in releases of Chrome and Firefox.

##### RESTRICTED_TLS cipher suites

 * TLS_AES_128_GCM_SHA256[¹][tlsv13_only]
 * TLS_AES_256_GCM_SHA384[¹][tlsv13_only]
 * TLS_CHACHA20_POLY1305_SHA256[¹][tlsv13_only]

        assertNotNull(type1Token);
        assertTrue(type1Token.length > 0);

        // Decode the token to verify its properties
        Type1Message type1Message = new Type1Message(type1Token);
        // Type1Message ORs default flags with provided flags; ensure expected bits are present
        assertTrue((type1Message.getFlags() & context.ntlmsspFlags) == context.ntlmsspFlags);
        assertEquals(domain, type1Message.getSuppliedDomain());
    }