Kasiyer 💁  "Hamburgerler hazır !" 🍔 dediğinde ve görüntülenen numara sizin numaranız olduğunda hemen koşup hamburgerlerinizi almaya çalışmıyorsunuz. Biliyorsunuzki kimse sizin hamburgerlerinizi 🍔 çalmayacak çünkü sıra sizin.

Yani Aşkınızın😍 hikayeyi bitirmesini bekliyorsunuz (çalışmayı bitir ⏯ / görev işleniyor.. 🤓), nazikçe gülümseyin ve hamburger yemeye gittiğinizi söyleyin ⏸.

For those cases, you can use a `Response` parameter.

## Use a `Response` parameter { #use-a-response-parameter }

You can declare a parameter of type `Response` in your *path operation function* (as you can do for cookies and headers).

And then you can set the `status_code` in that *temporal* response object.

}
```

## Recap { #recap }

You can add multiple body parameters to your *path operation function*, even though a request can only have a single body.

But **FastAPI** will handle it, give you the correct data in your function, and validate and document the correct schema in the *path operation*.

You can also declare singular values to be received as part of the body.

ana özelliklerden biri de koddan veriyi alıp ağ üzerinde gönderilebilecek bir şeye çevirmek, yani veri <abbr title="Dönüşüm: serialization, marshalling olarak da biliniyor">dönüşümü</abbr>. Bu işleme veritabanındaki veriyi içeren bir objeyi JSON objesine çevirmek, `datetime` objelerini metinlere çevirmek gibi örnekler verilebilir.

API'lara gereken bir diğer büyük özellik ise veri doğrulamadır, yani verinin çeşitli parametrelere bağlı olarak doğru ve tutarlı olduğundan emin olmaktır. Örneğin...

    /** Array of fields that can be highlighted in search results */
    protected String[] highlightedFields;

    /** Array of fields that can be searched against */
    protected String[] searchFields;

    /** Set of fields that can be searched against for O(1) lookup */
    protected Set<String> searchFieldSet;

    /** Array of fields that can be used for faceted search */
    protected String[] facetFields;

So, you can look for that specific exception inside the dependency with `except SomeException`.

In the same way, you can use `finally` to make sure the exit steps are executed, no matter if there was an exception or not.

{* ../../docs_src/dependencies/tutorial007_py39.py hl[3,5] *}

## Sub-dependencies with `yield` { #sub-dependencies-with-yield }

{* ../../docs_src/query_params_str_validations/tutorial006_an_py39.py hl[9] *}

### Required, can be `None` { #required-can-be-none }

You can declare that a parameter can accept `None`, but that it's still required. This would force clients to send a value, even if the value is `None`.

# `Request` class

You can declare a parameter in a *path operation function* or dependency to be of type `Request` and then you can access the raw request object directly, without any validation, etc.

You can import it directly from `fastapi`:

```python
from fastapi import Request
```

/// tip

We are not restricted to having only one dependency that can return that type of data.

///

## Other models { #other-models }

You can now get the current user directly in the *path operation functions* and deal with the security mechanisms at the **Dependency Injection** level, using `Depends`.

And you can use any model or data for the security requirements (in this case, a Pydantic model `User`).

# Declare Request Example Data { #declare-request-example-data }

You can declare examples of the data your app can receive.

Here are several ways to do it.

## Extra JSON Schema data in Pydantic models { #extra-json-schema-data-in-pydantic-models }

You can declare `examples` for a Pydantic model that will be added to the generated JSON Schema.

{* ../../docs_src/schema_extra_example/tutorial001_py310.py hl[13:24] *}