* It can do something to that **response** or run any needed code.
* Then it returns the **response**.

!!! note "Technical Details"
    If you have dependencies with `yield`, the exit code will run *after* the middleware.

    If there were any background tasks (documented later), they will run *after* all the middleware.

## Create a middleware

* Sie kann etwas mit dieser **Response** tun oder beliebigen Code ausführen.
* Dann gibt sie die **Response** zurück.

!!! note "Technische Details"
    Wenn Sie Abhängigkeiten mit `yield` haben, wird der Exit-Code *nach* der Middleware ausgeführt.

    Wenn es Hintergrundaufgaben gab (später dokumentiert), werden sie *nach* allen Middlewares ausgeführt.

## Erstellung einer Middleware

* **요청**을 응용 프로그램의 *경로 작동*으로 전달하여 처리합니다.
* 애플리케이션의 *경로 작업*에서 생성한 **응답**를 받습니다.
* **응답** 또는 다른 필요한 코드를 실행시키는 동작을 할 수 있습니다.
* **응답**를 반환합니다.

!!! note "기술 세부사항"
    만약 `yield`를 사용한 의존성을 가지고 있다면, 미들웨어가 실행되고 난 후에 exit이 실행됩니다.

    만약 (나중에 문서에서 다룰) 백그라운드 작업이 있다면, 모든 미들웨어가 실행되고 *난 후에* 실행됩니다.

## 미들웨어 만들기

미들웨어를 작성하기 위해서 함수 상단에 `@app.middleware("http")` 데코레이터를 사용할 수 있습니다.

미들웨어 함수는 다음 항목들을 받습니다:

* `request`.

# 🔗 ⏮️ 🌾

FastAPI 🐕‍🦺 🔗 👈 <abbr title='sometimes also called "exit", "cleanup", "teardown", "close", "context managers", ...'>➕ 🔁 ⏮️ 🏁</abbr>.

👉, ⚙️ `yield` ↩️ `return`, &amp; ✍ ➕ 🔁 ⏮️.

!!! tip
    ⚒ 💭 ⚙️ `yield` 1️⃣ 👁 🕰.

!!! note "📡 ℹ"
    🙆 🔢 👈 ☑ ⚙️ ⏮️:

    * <a href="https://docs.python.org/3/library/contextlib.html#contextlib.contextmanager" class="external-link" target="_blank">`@contextlib.contextmanager`</a> ⚖️

    logging.info(f"PR #{pr.number} has labels: {label_strs}")
    if not langs or lang_all_label not in label_strs:
        logging.info(f"PR #{pr.number} doesn't seem to be a translation PR, skipping")
        sys.exit(0)

    # Generate translation map, lang ID to discussion
    discussions = get_graphql_translation_discussions(settings=settings)
    lang_to_discussion_map: Dict[str, AllDiscussionsDiscussionNode] = {}

            <root>
                <mxCell id="0"/>
                <mxCell id="1" parent="0"/>
                <mxCell id="8" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;strokeWidth=3;exitX=0.092;exitY=1.01;exitDx=0;exitDy=0;dashed=1;exitPerimeter=0;" parent="1" edge="1">
                    <mxGeometry relative="1" as="geometry">
                        <Array as="points">
                            <mxPoint x="800" y="521"/>

    assert response.json() == "Listen to the Bar Fighters"
    response = client.put("/get-or-create-task/bar")
    assert response.status_code == 201, response.text

Here's an incomplete list of some of them.

!!! tip
    If you have an article, project, tool, or anything related to **FastAPI** that is not yet listed here, create a <a href="https://github.com/tiangolo/fastapi/edit/master/docs/en/data/external_links.yml" class="external-link" target="_blank">Pull Request adding it</a>.

{% for section_name, section_content in external_links.items() %}

## {{ section_name }}

    if (
        people_old_content == new_people_content
        and github_sponsors_old_content == new_github_sponsors_content
    ):
        logging.info("The FastAPI People data hasn't changed, finishing.")
        sys.exit(0)
    people_path.write_text(new_people_content, encoding="utf-8")
    github_sponsors_path.write_text(new_github_sponsors_content, encoding="utf-8")
    logging.info("Setting up GitHub Actions git user")

from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

SQLALCHEMY_DATABASE_URL = "sqlite:///./sql_app.db"
# SQLALCHEMY_DATABASE_URL = "postgresql://user:password@postgresserver/db"

engine = create_engine(
    SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)