# 服务器发送事件（SSE） { #server-sent-events-sse }

你可以使用**服务器发送事件**（SSE）向客户端流式发送数据。

这类似于[流式传输 JSON Lines](stream-json-lines.md)，但使用 `text/event-stream` 格式，浏览器原生通过 [`EventSource` API](https://developer.mozilla.org/en-US/docs/Web/API/EventSource) 支持。

/// info | 信息

新增于 FastAPI 0.135.0。

///

## 什么是服务器发送事件？ { #what-are-server-sent-events }

SSE 是一种通过 HTTP 从服务器向客户端流式传输数据的标准。

每个事件是一个带有 `data`、`event`、`id` 和 `retry` 等“字段”的小文本块，以空行分隔。

Используя эти инструменты, Вы можете напрямую задействовать [pytest](https://docs.pytest.org/) с **FastAPI**.

## Использование класса `TestClient` { #using-testclient }

/// info | Информация

Для использования класса `TestClient` сначала установите [`httpx`](https://www.python-httpx.org).

)

const (
	// Lifecycle configuration file.
	bucketLifecycleConfig = "lifecycle.xml"
)

// PutBucketLifecycleHandler - This HTTP handler stores given bucket lifecycle configuration as per
// https://docs.aws.amazon.com/AmazonS3/latest/dev/object-lifecycle-mgmt.html
func (api objectAPIHandlers) PutBucketLifecycleHandler(w http.ResponseWriter, r *http.Request) {
	ctx := newContext(r, w, "PutBucketLifecycle")

	// GCS storage decompresses a gzipped object by default and returns the data.
	// Refer to https://cloud.google.com/storage/docs/transcoding#decompressive_transcoding
	// Need to set `Accept-Encoding` header to `gzip` when issuing a GetObject call, to be able
	// to download the object in compressed state.
	// Calling ReadCompressed with true accomplishes that.

{* ../../docs_src/generate_clients/tutorial001_py310.py hl[7:9,12:13,16:17,21] *}

*경로 처리*에서 요청 페이로드와 응답 페이로드에 사용하는 모델을 `Item`, `ResponseMessage` 모델로 정의하고 있다는 점에 주목하세요.

### API 문서 { #api-docs }

`/docs`로 이동하면, 요청으로 보낼 데이터와 응답으로 받을 데이터에 대한 **스키마(schemas)**가 있는 것을 볼 수 있습니다:

<img src="/img/tutorial/generate-clients/image01.png">

이 스키마는 앱에서 모델로 선언되었기 때문에 볼 수 있습니다.

Bunu, `Annotated` içinde [Pydantic’in `AfterValidator`](https://docs.pydantic.dev/latest/concepts/validators/#field-after-validator)’ını kullanarak yapabilirsiniz.

/// tip | İpucu

Pydantic’te [`BeforeValidator`](https://docs.pydantic.dev/latest/concepts/validators/#field-before-validator) ve başka validator’lar da vardır. 🤓

///

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package event

import (
	"encoding/json"
	"encoding/xml"
)

// Name - event type enum.
// Refer http://docs.aws.amazon.com/AmazonS3/latest/dev/NotificationHowTo.html#notification-how-to-event-types-and-destinations
// for most basic values we have since extend this and its not really much applicable other than a reference point.

labels.file_crawling_configuration=File Crawling
labels.file_crawling_title_details=File Crawling Config
labels.included_paths=Included Paths
labels.excluded_paths=Excluded Paths
labels.included_doc_paths=Included Doc Paths
labels.excluded_doc_paths=Excluded Doc Paths
labels.config_parameter=Config Parameters
labels.max_access_count=Max Access Count
labels.number_of_thread=Number of Threads
labels.interval_time=Interval
labels.millisec=msec

Es basiert auf [HTTPX](https://www.python-httpx.org), welches wiederum auf der Grundlage von Requests konzipiert wurde, es ist also sehr vertraut und intuitiv.

Damit können Sie [pytest](https://docs.pytest.org/) direkt mit **FastAPI** verwenden.

## `TestClient` verwenden { #using-testclient }

/// info | Info

Um `TestClient` zu verwenden, installieren Sie zunächst [`httpx`](https://www.python-httpx.org).

   <span style="background-color:#007166"><font color="#D3D7CF"> server </font></span>  Documentation at <font color="#729FCF"><u style="text-decoration-style:solid">http://127.0.0.1:8000/docs</u></font>

      <span style="background-color:#007166"><font color="#D3D7CF"> tip </font></span>  Running in development mode, for production use:
             <b>fastapi run</b>

             Logs: