"openapi": "3.1.0",
            "info": {"title": "FastAPI", "version": "0.1.0"},
            "paths": {
                "/product": {
                    "get": {
                        "summary": "Create Item",
                        "operationId": "create_item_product_get",
                        "requestBody": {
                            "content": {
                                "application/json": {

```JSON
{
  "item": "The Foo Wrestlers"
}
```

Aber wenn der Client `http://example.com/items/bar` anfordert (ein nicht-existierendes `item_id` `"bar"`), erhält er einen HTTP-Statuscode 404 (der „Not Found“-Error) und eine JSON-Response wie:

```JSON
{
  "detail": "Item not found"
}
```

/// tip | Tipp

Basit bir FastAPI uygulamasıyla başlayalım:

{* ../../docs_src/generate_clients/tutorial001_py310.py hl[7:9,12:13,16:17,21] *}

*Path operation*'ların, request payload ve response payload için kullandıkları modelleri `Item` ve `ResponseMessage` modelleriyle tanımladıklarına dikkat edin.

### API Dokümanları { #api-docs }

///

## Возврат пользовательского `Response` { #returning-a-custom-response }

Пример выше показывает все необходимые части, но он пока не очень полезен, так как вы могли бы просто вернуть `item` напрямую, и **FastAPI** поместил бы его в `JSONResponse`, преобразовав в `dict` и т.д. Всё это происходит по умолчанию.

Теперь давайте посмотрим, как можно использовать это для возврата пользовательского ответа.

Örneğin, item'ları güncellemeye izin veren bir *path operation*'ınız olduğunu düşünelim; başarılı olduğunda 200 "OK" HTTP status code'unu döndürüyor olsun.

Ancak yeni item'ları da kabul etmesini istiyorsunuz. Ve item daha önce yoksa, onu oluşturup 201 "Created" HTTP status code'unu döndürsün.

Bunu yapmak için `JSONResponse` import edin ve içeriğinizi doğrudan onunla döndürün; istediğiniz `status_code`'u da ayarlayın:

upload is too large (max %s)",wrongFileType:"Only files of type %s is allowed",groupCheckedRangeStart:"Please choose between ",groupCheckedTooFewStart:"Please choose at least ",groupCheckedTooManyStart:"Please choose a maximum of ",groupCheckedEnd:" item(s)",badCreditCard:"The credit card number is not correct",badCVV:"The CVV number was not correct",wrongFileDim:"Incorrect image dimensions,",imageTooTall:"the image can not be taller than",imageTooWide:"the image can not be wider than",imageTooSmall:"the...

  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  align-items: center;
}

.announce-wrapper #announce-left div.item {
  display: none;
}

.announce-wrapper #announce-right {
  display: none;
}

.announce-wrapper #announce-right div.item {
  display: none;
}

.announce-wrapper .sponsor-badge {
  display: block;
  position: absolute;
  top: -10px;
  right: 0;

   * Queue#isEmpty} and {@link Queue#remove()}, since {@link Queue}'s iteration order is undefined.
   * Calling {@link Iterator#hasNext()} on a generated iterator from the returned iterable may cause
   * an item to be immediately dequeued for return on a subsequent call to {@link Iterator#next()}.
   *
   * <p>Whether the input {@code iterable} is a {@link Queue} or not, the returned {@code Iterable}
   * is not thread-safe.
   *

```

</div>

Abra seu navegador em: [http://127.0.0.1:8000](http://127.0.0.1:8000).

Lá você pode definir:

* O "Item ID", usado no path.
* O "Token" usado como um parâmetro de consulta.

/// tip | Dica

Perceba que a consulta `token` será manipulada por uma dependência.

///

<img src="/img/python-types/image05.png">

Ohne Typen ist das fast unmöglich zu erreichen.

Beachten Sie, dass die Variable `item` eines der Elemente in der Liste `items` ist.

Und trotzdem weiß der Editor, dass es sich um ein `str` handelt, und bietet entsprechende Unterstützung.

#### Tupel und Menge { #tuple-and-set }