Mas uma variável como `user-agent` é inválida em Python.

Portanto, por padrão, `Header` converterá os caracteres de nomes de parâmetros de sublinhado (`_`) para hífen (`-`) para extrair e documentar os cabeçalhos.

```JSON
{"item_id":3}
```

!!! check
    👀 👈 💲 👆 🔢 📨 (& 📨) `3`, 🐍 `int`, 🚫 🎻 `"3"`.

    , ⏮️ 👈 🆎 📄, **FastAPI** 🤝 👆 🏧 📨 <abbr title="converting the string that comes from an HTTP request into Python data">"✍"</abbr>.

## 💽 🔬

✋️ 🚥 👆 🚶 🖥 <a href="http://127.0.0.1:8000/items/foo" class="external-link" target="_blank">http://127.0.0.1:8000/items/foo</a>, 👆 🔜 👀 👌 🇺🇸🔍 ❌:

从 API 文档（URL 是 `https://gltnci.deta.dev/docs`）发送请求至*路径操作* `/items/{item_id}`。

例如，ID `5`。

现在跳转至 <a href="https://web.deta.sh/" class="external-link" target="_blank">https://web.deta.sh。</a>

左边栏有个 <abbr title="it comes from Micro(server)">"Micros"</abbr> 标签，里面是所有的应用。

还有一个 **Details** 和 **Visor** 标签，跳转到 **Visor** 标签。

在这里查看最近发送给应用的请求。

您可以编辑或重新使用这些请求。

<img src="/img/deployment/deta/image02.png">

## 更多内容

### Install `pydantic-settings`

First, install the `pydantic-settings` package:

<div class="termy">

```console
$ pip install pydantic-settings
---> 100%
```

</div>

It also comes included when you install the `all` extras with:

<div class="termy">

```console
$ pip install "fastapi[all]"
---> 100%
```

</div>

!!! info

* <a href="https://github.com/Kludex/python-multipart" target="_blank"><code>python-multipart</code></a> - Required if you want to support form <abbr title="converting the string that comes from an HTTP request into Python data">"parsing"</abbr>, with `request.form()`.
* <a href="https://pythonhosted.org/itsdangerous/" target="_blank"><code>itsdangerous</code></a> - Required for `SessionMiddleware` support.

def read_url():
    return {"message": "Hello World"}
```

Veja as similaridades em `requests.get(...)` e `@app.get(...)`.

!!! check "**FastAPI** inspirado para"
    * Ter uma API simples e intuitiva.
    * Utilizar nomes de métodos HTTP (operações) diretamente, de um jeito direto e intuitivo.
    * Ter padrões sensíveis, mas customizações poderosas.

## CRUD utils

Now let's see the file `sql_app/crud.py`.

In this file we will have reusable functions to interact with the data in the database.

**CRUD** comes from: **C**reate, **R**ead, **U**pdate, and **D**elete.

...although in this example we are only creating and reading.

### Read data

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    description: str


items = [
    {"name": "Foo", "description": "There comes my hero"},
    {"name": "Red", "description": "It's my aeroplane"},
]


@app.get("/items/", response_model=list[Item])
async def read_items():

E esses modelos estão compartilhando muitos dos dados e duplicando nomes e tipos de atributos.

Nós poderíamos fazer melhor.

* **Robuste** : Obtenez un code prêt pour la production. Avec une documentation interactive automatique.