이 경우 미들웨어는 들어오는 요청을 가로채 적절한 CORS 헤더와, 정보 제공을 위한 `200` 또는 `400` 응답으로 응답합니다.

### 단순한 요청

`Origin` 헤더를 가진 모든 요청. 이 경우 미들웨어는 요청을 정상적으로 전달하지만, 적절한 CORS 헤더를 응답에 포함시킵니다.

## 더 많은 정보

<abbr title="교차-출처 리소스 공유">CORS</abbr>에 대한 더 많은 정보를 알고싶다면, <a href="https://developer.mozilla.org/ko/docs/Web/HTTP/CORS" class="external-link" target="_blank">Mozilla CORS 문서</a>를 참고하기 바랍니다.

!!! note "기술적 세부 사항"

### What is "Mounting"

"Mounting" means adding a complete "independent" application in a specific path, that then takes care of handling all the sub-paths.

This is different from using an `APIRouter` as a mounted application is completely independent. The OpenAPI and docs from your main application won't include anything from the mounted application, etc.

These examples run the server program (e.g Uvicorn), starting **a single process**, listening on all the IPs (`0.0.0.0`) on a predefined port (e.g. `80`).

This is the basic idea. But you will probably want to take care of some additional things, like:

* Security - HTTPS
* Running on startup
* Restarts
* Replication (the number of processes running)
* Memory
* Previous steps before starting

## Mounting a **FastAPI** application

"Mounting" means adding a completely "independent" application in a specific path, that then takes care of handling everything under that path, with the _path operations_ declared in that sub-application.

### Top-level application

First, create the main, top-level, **FastAPI** application, and its *path operations*:

The only thing the function returned by `GzipRequest.get_route_handler` does differently is convert the `Request` to a `GzipRequest`.

Doing this, our `GzipRequest` will take care of decompressing the data (if necessary) before passing it to our *path operations*.

After that, all of the processing logic is the same.

## 🌅 ℹ

🌖 ℹ 🔃 <abbr title="Cross-Origin Resource Sharing">⚜</abbr>, ✅ <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS" class="external-link" target="_blank">🦎 ⚜ 🧾</a>.

!!! note "📡 ℹ"
    👆 💪 ⚙️ `from starlette.middleware.cors import CORSMiddleware`.

## Больше информации

Для получения более подробной информации о <abbr title="Cross-Origin Resource Sharing">CORS</abbr>, обратитесь к <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS" class="external-link" target="_blank">Документации CORS от Mozilla</a>.

!!! note "Технические детали"

  # Twitter
  twitter:card: summary_large_image
  twitter.title: *page_title_with_site_name
  twitter:description: *page_description
  twitter:image: "{{ image.url }}"

# -----------------------------------------------------------------------------
# Specification
# -----------------------------------------------------------------------------

# Card size and layers
size: { width: 1200, height: 630 }

    !!! tip
        Prefer to use the `Annotated` version if possible.

    ```Python hl_lines="7"
    {!> ../../../docs_src/dependencies/tutorial011.py!}
    ```

In this case, **FastAPI** won't ever touch or care about `__init__`, we will use it directly in our code.

## Create an instance

We could create an instance of this class with:

=== "Python 3.9+"

    ```Python hl_lines="18"

# Sub-dependencies

You can create dependencies that have **sub-dependencies**.

They can be as **deep** as you need them to be.

**FastAPI** will take care of solving them.

## First dependency "dependable"

You could create a first dependency ("dependable") like:

=== "Python 3.10+"

    ```Python hl_lines="8-9"
    {!> ../../../docs_src/dependencies/tutorial005_an_py310.py!}
    ```

=== "Python 3.9+"