# Templates { #templates }

You can use any template engine you want with **FastAPI**.

A common choice is Jinja2, the same one used by Flask and other tools.

There are utilities to configure it easily that you can use directly in your **FastAPI** application (provided by Starlette).

## Install dependencies { #install-dependencies }

Make sure you create a [virtual environment](../virtual-environments.md), activate it, and install `jinja2`:

{* ../../docs_src/body_nested_models/tutorial004_py310.py hl[18] *}

Cela signifie que FastAPI attendrait un corps similaire à :

```JSON
{
    "name": "Foo",
    "description": "The pretender",
    "price": 42.0,
    "tax": 3.2,
    "tags": ["rock", "metal", "bar"],
    "image": {
        "url": "http://example.com/baz.jpg",
        "name": "The Foo live"
    }
}
```

```JSON
{
    "name": "Foo",
    "description": "An optional description",
    "price": 45.2,
    "tax": 3.5
}
```

...como `description` e `tax` são opcionais (com um valor padrão de `None`), esse JSON "`object`" também é válido:

```JSON
{
    "name": "Foo",
    "price": 45.2
}
```

## Declare como um parâmetro { #declare-it-as-a-parameter }

# The title of environment (e.g. local or integration or production)
environment.title = Production

# Does it enable the Framework internal debug? (true only when emergency)
framework.debug = false

# one day: 86400000, three days: 259200000, five days: 432000000, one week: 604800000, one year: 31556926000
# special script :: absolute mode: $(2014/07/10), relative mode: addDay(3).addMonth(4)

        final String message = "Test stack trace";
        final VaMessenger<FessMessages> messageCode = messages -> messages.addErrorsSsoLoginError(UserMessages.GLOBAL_PROPERTY_KEY);
        final Exception cause = new RuntimeException("Root cause");

        // Execute
        final SsoMessageException exception = new SsoMessageException(messageCode, message, cause);

        // Verify stack trace is available

SSE는 서버에서 클라이언트로 HTTP를 통해 데이터를 스트리밍하기 위한 표준입니다.

각 이벤트는 `data`, `event`, `id`, `retry`와 같은 "필드"를 가진 작은 텍스트 블록이며, 빈 줄로 구분됩니다.

다음과 같습니다:

```
data: {"name": "Portal Gun", "price": 999.99}

data: {"name": "Plumbus", "price": 32.99}

```

SSE는 AI 채팅 스트리밍, 실시간 알림, 로그와 관측성, 그리고 서버가 클라이언트로 업데이트를 푸시하는 여러 경우에 흔히 사용됩니다.

/// tip | 팁

{* ../../docs_src/body_nested_models/tutorial004_py310.py hl[18] *}

Це означатиме, що  **FastAPI**  очікуватиме тіло запиту такого вигляду:

```JSON
{
    "name": "Foo",
    "description": "The pretender",
    "price": 42.0,
    "tax": 3.2,
    "tags": ["rock", "metal", "bar"],
    "image": {
        "url": "http://example.com/baz.jpg",
        "name": "The Foo live"
    }
}
```

  @Override
  protected Map<String, Integer> makePopulatedMap() {
    RowSortedTable<String, Character, Integer> table = TreeBasedTable.create();
    table.put("one", 'a', 1);
    table.put("two", 'a', 2);
    table.put("three", 'a', 3);
    table.put("four", 'b', 4);
    return unmodifiableRowSortedTable(table).column('a');
  }

  }

  @Override
  protected Map<String, Integer> makePopulatedMap() {
    Table<String, Character, Integer> table = HashBasedTable.create();
    table.put("one", 'a', 1);
    table.put("two", 'a', 2);
    table.put("three", 'a', 3);
    table.put("four", 'b', 4);
    return unmodifiableTable(table).column('a');
  }

        ImmutableListMultimap.<Integer, String>builder()
            .putAll(3, "one", "two")
            .put(5, "three")
            .put(4, "four")
            .build();
    ImmutableListMultimap<Integer, String> index =
        FluentIterable.from(asList("one", "two", "three", "four"))
            .index(
                new Function<String, Integer>() {
                  @Override