## Technische Details { #technical-details }

FastAPI implementiert einige bewährte SSE-Praktiken direkt out of the box.

- Alle 15 Sekunden, wenn keine Nachricht gesendet wurde, einen **„keep alive“-`ping`-Kommentar** senden, um zu verhindern, dass einige Proxys die Verbindung schließen, wie in der [HTML-Spezifikation: Server-Sent Events](https://html.spec.whatwg.org/multipage/server-sent-events.html#authoring-notes) vorgeschlagen.

{* ../../docs_src/server_sent_events/tutorial005_py310.py hl[14] *}

## Detalhes Técnicos { #technical-details }

O FastAPI implementa algumas boas práticas de SSE prontas para uso.

- Enviar um comentário de keep alive `ping` a cada 15 segundos quando não houver mensagens, para evitar que alguns proxies fechem a conexão, como sugerido na [especificação HTML: Server-Sent Events](https://html.spec.whatwg.org/multipage/server-sent-events.html#authoring-notes).

 * This API does not try to cover all the requirements out there, just the basic ones, and is intentionally simple.
 * If plugin or extension needs anything more complex feature wise (i.e. HTTP range support or alike) it should
 * probably roll its own.
 * <p>
 * This implementation is backed by Maven Resolver API, supported protocols and transport selection depends on it. If

	MaxValiditySeconds int                    `json:"maxValiditySeconds"`
	Claims             map[string]interface{} `json:"claims"`
}

var tokens map[string]Resp = map[string]Resp{
	"aaa": {
		User:               "Alice",
		MaxValiditySeconds: 3600,
		Claims: map[string]interface{}{
			"groups": []string{"data-science"},
		},
	},
	"bbb": {
		User:               "Bart",
		MaxValiditySeconds: 3600,

 *
 * <p><b>Warning:</b> The methods of {@code ForwardingSet} forward <b>indiscriminately</b> to the
 * methods of the delegate. For example, overriding {@link #add} alone <b>will not</b> change the
 * behavior of {@link #addAll}, which can lead to unexpected behavior. In this case, you should
 * override {@code addAll} as well, either providing your own implementation, or delegating to the

Wenn Sie jedoch über dieselbe **FastAPI**-App auf Variablen und Objekte zugreifen oder kleine Hintergrundtasks ausführen müssen (z. B. das Senden einer E-Mail-Benachrichtigung), können Sie einfach `BackgroundTasks` verwenden.

## Zusammenfassung { #recap }

- [HTML spesifikasyonu: Server-Sent Events](https://html.spec.whatwg.org/multipage/server-sent-events.html#authoring-notes) önerisine uygun olarak, bazı proxy'lerin bağlantıyı kapatmasını önlemek için, 15 saniye boyunca hiç mesaj gelmezse **"keep alive" `ping` yorumu** gönderir.
- Akışın **cache'lenmesini önlemek** için `Cache-Control: no-cache` header'ını ayarlar.
- Nginx gibi bazı proxy'lerde **buffering'i önlemek** için özel `X-Accel-Buffering: no` header'ını ayarlar.

## Технические детали { #technical-details }

FastAPI из коробки реализует некоторые лучшие практики для SSE.

- Отправлять комментарий «ping» для поддержания соединения («keep alive») каждые 15 секунд, когда нет сообщений, чтобы предотвратить закрытие соединения некоторыми прокси, как рекомендовано в [HTML specification: Server-Sent Events](https://html.spec.whatwg.org/multipage/server-sent-events.html#authoring-notes).

 *
 * <p><b>Warning:</b> The methods of {@code ForwardingQueue} forward <b>indiscriminately</b> to the
 * methods of the delegate. For example, overriding {@link #add} alone <b>will not</b> change the
 * behavior of {@link #offer} which can lead to unexpected behavior. In this case, you should
 * override {@code offer} as well, either providing your own implementation, or delegating to the

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