///

FastAPI는 요청을 자동으로 변환해, 매개변수의 `item`과 `user`를 특별한 내용으로 받도록 할 것입니다.

복합 데이터의 검증을 수행하고 OpenAPI 스키마 및 자동 문서를 문서화합니다.

## 본문 내의 단일 값

쿼리 및 경로 매개변수에 대한 추가 데이터를 정의하는 `Query`와 `Path`와 같이, **FastAPI**는 동등한 `Body`를 제공합니다.

예를 들어 이전의 모델을 확장하면, `item`과 `user`와 동일한 본문에 또 다른 `importance`라는 키를 갖도록 할 수있습니다.

단일 값을 그대로 선언한다면, **FastAPI**는 쿼리 매개변수로 가정할 것입니다.

    * Wenn Sie Starlette vergleichen, vergleichen Sie es mit Webframeworks (oder Mikroframeworks) wie Sanic, Flask, Django, usw.
* **FastAPI**:
    * So wie Starlette Uvicorn verwendet und nicht schneller als dieses sein kann, verwendet **FastAPI** Starlette, sodass es nicht schneller als dieses sein kann.

You can use the `TestClient` class to test FastAPI applications without creating an actual HTTP and socket connection, just communicating directly with the FastAPI code.

Read more about it in the [FastAPI docs for Testing](https://fastapi.tiangolo.com/tutorial/testing/).

You can import it directly from `fastapi.testclient`:

```python
from fastapi.testclient import TestClient
```

    * If you are comparing Starlette, compare it against Sanic, Flask, Django, etc. Web frameworks (or microframeworks).
* **FastAPI**:
    * The same way that Starlette uses Uvicorn and cannot be faster than it, **FastAPI** uses Starlette, so it cannot be faster than it.

* **FastAPI**:
    * 与 Starlette 使用 Uvicorn 一样，由于 **FastAPI** 使用 Starlette，因此 FastAPI 不能比 Starlette 更快。
    * FastAPI 在 Starlette 基础上提供了更多功能。例如在开发 API 时，所需的数据验证和序列化功能。FastAPI 可以帮助您自动生成 API文档，（文档在应用程序启动时自动生成，所以不会增加应用程序运行时的开销）。
    * 如果您不使用 FastAPI 而直接使用 Starlette（或诸如 Sanic，Flask，Responder 等其它工具），您则要自己实现所有的数据验证和序列化。那么最终您的应用程序会和使用 FastAPI 构建的程序有相同的开销。一般这种数据验证和序列化的操作在您应用程序的代码中会占很大比重。

from fastapi import FastAPI, Request, status
from fastapi.encoders import jsonable_encoder
from fastapi.exceptions import RequestValidationError
from fastapi.responses import JSONResponse
from pydantic import BaseModel

app = FastAPI()


@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request: Request, exc: RequestValidationError):
    return JSONResponse(
        status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,

# History, Design and Future

Some time ago, <a href="https://github.com/fastapi/fastapi/issues/3#issuecomment-454956920" class="external-link" target="_blank">a **FastAPI** user asked</a>:

> What’s the history of this project? It seems to have come from nowhere to awesome in a few weeks [...]

Here's a little bit of that history.

## Alternatives

# História, Design e Futuro

Há algum tempo, <a href="https://github.com/fastapi/fastapi/issues/3#issuecomment-454956920" class="external-link" target="_blank">um usuário **FastAPI** perguntou</a>:

> Qual é a história desse projeto? Parece que surgiu do nada e se tornou incrível em poucas semanas [...]

Aqui está um pouco dessa história.

## Alternativas

Using it in your editor is what really shows you the benefits of FastAPI, seeing how little code you have to write, all the type checks, autocompletion, etc.

---

## Install FastAPI

The first step is to install FastAPI.

Make sure you create a [virtual environment](../virtual-environments.md){.internal-link target=_blank}, activate it, and then **install FastAPI**:

<div class="termy">

```console

* <a href="https://ariadnegraphql.org/" class="external-link" target="_blank">👸</a>
    * ⏮️ <a href="https://ariadnegraphql.org/docs/fastapi-integration" class="external-link" target="_blank">🩺 FastAPI</a>
* <a href="https://tartiflette.io/" class="external-link" target="_blank">🍟</a>