* Controllo sulle annotazioni di tipo.
* Validazione dei dati:
    * Errori chiari e automatici quando i dati sono invalidi.
    * Validazione anche per gli oggetti JSON più complessi.
* <abbr title="anche noto come: serializzazione, parsing, marshalling">Conversione</abbr> dei dati di input: da risorse esterne a dati e tipi di Python. È possibile leggere da:
    * JSON.
    * Path parameters.
    * Query parameters.
    * Cookies.

.btn-primary:disabled {\n  color: #fff;\n  background-color: #007bff;\n  border-color: #007bff;\n}\n\n.btn-primary:not(:disabled):not(.disabled):active, .btn-primary:not(:disabled):not(.disabled).active,\n.show > .btn-primary.dropdown-toggle {\n  color: #fff;\n  background-color: #0062cc;\n  border-color: #005cbf;\n}\n\n.btn-primary:not(:disabled):not(.disabled):active:focus, .btn-primary:not(:disabled):not(.disabled).active:focus,\n.show > .btn-primary.dropdown-toggle:focus {\n  box-shadow: 0 0 0 0.2rem rgba(38,...

.btn-primary:disabled {\n  color: #fff;\n  background-color: #007bff;\n  border-color: #007bff;\n}\n\n.btn-primary:not(:disabled):not(.disabled):active, .btn-primary:not(:disabled):not(.disabled).active,\n.show > .btn-primary.dropdown-toggle {\n  color: #fff;\n  background-color: #0062cc;\n  border-color: #005cbf;\n}\n\n.btn-primary:not(:disabled):not(.disabled):active:focus, .btn-primary:not(:disabled):not(.disabled).active:focus,\n.show > .btn-primary.dropdown-toggle:focus {\n  box-shadow: 0 0 0 0.2rem rgba(38,...

<img src="/img/tutorial/response-status-code/image01.png">

!!! note "Nota"
    Alguns códigos de resposta (consulte a próxima seção) indicam que a resposta não possui um corpo.

    O FastAPI sabe disso e produzirá documentos OpenAPI informando que não há corpo de resposta.

## Sobre os códigos de status HTTP

!!! note "Nota"
    Se você já sabe o que são códigos de status HTTP, pule para a próxima seção.

<span style="color: green;">INFO</span>:     Waiting for application startup.
<span style="color: green;">INFO</span>:     Application startup complete.
```

</div>

!!! note "Nota"
    O comando `uvicorn main:app` se refere a:

    * `main`: o arquivo `main.py` (o "módulo" Python).
    * `app`: o objeto criado no arquivo `main.py` com a linha `app = FastAPI()`.

astunparse == 1.6.3
dill == 0.3.7
astor == 0.7.1
typing_extensions == 4.8.0
gast == 0.4.0
termcolor == 2.3.0
wrapt == 1.16.0
tblib == 2.0.0

# Install tensorboard, and keras
# Note that here we want the latest version that matches TF major.minor version
# Note that we must use nightly here as these are used in nightly jobs
# For release jobs, we will pin these on the release branch
keras-nightly ~= 3.0.0.dev
tb-nightly ~= 2.17.0.a

<img src="/img/tutorial/response-status-code/image01.png">

!!! note "Hinweis"
    Einige Responsecodes (siehe nächster Abschnitt) kennzeichnen, dass die Response keinen Body hat.

    FastAPI versteht das und wird in der OpenAPI-Dokumentation anzeigen, dass es keinen Responsebody gibt.

## Über HTTP-Statuscodes

!!! note "Hinweis"

* **`300`** and above are for "Redirection".  Responses with these status codes may or may not have a body, except for `304`, "Not Modified", which must not have one.
* **`400`** and above are for "Client error" responses. These are the second type you would probably use the most.
    * An example is `404`, for a "Not Found" response.

它可以：

* 在响应中返回状态码
* 在 OpenAPI 概图（及用户界面）中存档：

<img src="/img/tutorial/response-status-code/image01.png">

!!! note "笔记"

    某些响应状态码表示响应没有响应体（参阅下一章）。

    FastAPI 可以进行识别，并生成表明无响应体的 OpenAPI 文档。

## 关于 HTTP 状态码

!!! note "笔记"

    如果已经了解 HTTP 状态码，请跳到下一章。

在 HTTP 协议中，发送 3 位数的数字状态码是响应的一部分。

这些状态码都具有便于识别的关联名称，但是重要的还是数字。

简言之：

  // +optional
  optional k8s.io.api.core.v1.ObjectReference related = 9;

  // note is a human-readable description of the status of this operation.
  // Maximal length of the note is 1kB, but libraries should be prepared to
  // handle values up to 64kB.
  // +optional
  optional string note = 10;

  // type is the type of this event (Normal, Warning), new types could be added in the future.