This code is something you can actually use in your application, save the password hashes in your database, etc.

We are going to start from where we left in the previous chapter and increment it.

## About JWT

JWT means "JSON Web Tokens".

It's a standard to codify a JSON object in a long dense string without spaces. It looks like this:

```

!!! note
    If you are a Python expert, and you already know everything about type hints, skip to the next chapter.

## Motivation

Let's start with a simple example:

```Python
{!../../../docs_src/python_types/tutorial001.py!}
```

Calling this program outputs:

```
John Doe
```

The function does the following:

### Translations

* 🌐 Start of Hebrew translation. PR [#5050](https://github.com/tiangolo/fastapi/pull/5050) by [@itay-raveh](https://github.com/itay-raveh).
* 🔧 Add config for Swedish translations notification. PR [#5147](https://github.com/tiangolo/fastapi/pull/5147) by [@tiangolo](https://github.com/tiangolo).

이 이미지는 **민감한 디폴트** 값을 가지고 있지만, 여러분들은 여전히 **환경 변수** 또는 설정 파일을 통해 설정값을 수정하고 업데이트 할 수 있습니다.

또한 스크립트를 통해 <a href="https://github.com/tiangolo/uvicorn-gunicorn-fastapi-docker#pre_start_path" class="external-link" target="_blank">**시작하기 전 사전 단계**</a>를 실행하는 것을 지원합니다.

!!! tip "팁"

async def read_items(
    item_id: UUID,
    start_datetime: Annotated[datetime, Body()],
    end_datetime: Annotated[datetime, Body()],
    process_after: Annotated[timedelta, Body()],
    repeat_at: Annotated[Union[time, None], Body()] = None,
):
    start_process = start_datetime + process_after
    duration = end_datetime - start_process
    return {
        "item_id": item_id,
        "start_datetime": start_datetime,

    typography:
      content: *page_title
      align: start
      color: *color
      line:
        amount: 3
        height: 1.25
      font:
        family: *font_family
        style: Bold

  # Page description
  - size: { width: 832, height: 64 }
    offset: { x: 64, y: 512 }
    typography:
      content: *page_description
      align: start
      color: *color
      line:
        amount: 2

from datetime import datetime

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class Subscription(BaseModel):
    username: str
    monthly_fee: float
    start_date: datetime


@app.webhooks.post("new-subscription")
def new_subscription(body: Subscription):
    """
    When a new user subscribes to your service we'll send you a POST request with this

<div class="termy">

```console
$ python ./scripts/docs.py live

<span style="color: green;">[INFO]</span> Serving on http://127.0.0.1:8008
<span style="color: green;">[INFO]</span> Start watching changes
<span style="color: green;">[INFO]</span> Start detecting changes
```

</div>

Das stellt die Dokumentation unter `http://127.0.0.1:8008` bereit.

This is because it is expected that **your users** would define the actual **URL path** where they want to receive the webhook request in some other way (e.g. a web dashboard).

### Check the docs

Now you can start your app and go to <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.

You will see your docs have the normal *path operations* and now also some **webhooks**:

* Sicherheit – HTTPS
* Beim Hochfahren ausführen
* Neustarts
* Replikation (die Anzahl der laufenden Prozesse)
* Arbeitsspeicher
* Schritte vor dem Start