In this case, the function parameter `q` will be optional, and will be `None` by default.

/// check

Also notice that **FastAPI** is smart enough to notice that the path parameter `item_id` is a path parameter and `q` is not, so, it's a query parameter.

///

## Query parameter type conversion { #query-parameter-type-conversion }

You can also declare `bool` types, and they will be converted:

## Retorno Adicional com `model` { #additional-response-with-model }

Você pode fornecer o parâmetro `responses` aos seus *decoradores de caminho*.

Este parâmetro recebe um `dict`, as chaves são os códigos de status para cada retorno, como por exemplo `200`, e os valores são um outro `dict` com a informação de cada um deles.

    private int currentPageNumber;

    /** Search/filter parameter for duplicate host configuration ID. */
    public String id;

    /** Search/filter parameter for regular hostname pattern. */
    public String regularName;

    /** Search/filter parameter for duplicate hostname pattern. */
    public String duplicateHostName;

    /** Search/filter parameter for duplicate host sort order. */
    public String sortOrder;

# Cookie-Parameter { #cookie-parameters }

Sie können Cookie-Parameter auf die gleiche Weise definieren wie `Query`- und `Path`-Parameter.

## `Cookie` importieren { #import-cookie }

Importieren Sie zuerst `Cookie`:

{* ../../docs_src/cookie_params/tutorial001_an_py310.py hl[3] *}

## `Cookie`-Parameter deklarieren { #declare-cookie-parameters }

Deklarieren Sie dann die Cookie-Parameter mit derselben Struktur wie bei `Path` und `Query`.

The function parameters will be recognized as follows:

* If the parameter is also declared in the **path**, it will be used as a path parameter.
* If the parameter is of a **singular type** (like `int`, `float`, `str`, `bool`, etc) it will be interpreted as a **query** parameter.
* If the parameter is declared to be of the type of a **Pydantic model**, it will be interpreted as a request **body**.

/// note

O la dependencia no devuelve un valor.

Pero aún necesitas que sea ejecutada/resuelta.

Para esos casos, en lugar de declarar un parámetro de *path operation function* con `Depends`, puedes añadir una `list` de `dependencies` al decorador de *path operation*.

## Agregar `dependencies` al decorador de *path operation* { #add-dependencies-to-the-path-operation-decorator }

* body
* request body
* response body
* JSON body
* form body
* file body
* function body

* parameter
* body parameter
* path parameter
* query parameter
* cookie parameter
* header parameter
* form parameter
* function parameter

* event
* startup event
* server'ın startup'ı
* shutdown event
* lifespan event

* handler
* event handler

      <parameters>
        <parameter>
          <name>finalName</name>
          <alias>jarName</alias>
          <type>java.lang.String</type>
          <implementation>java.lang.String</implementation>
          <required>false</required>
          <editable>true</editable>
          <description>parameter-description</description>
          <deprecated>deprecated-parameter</deprecated>
          <since>3.0.0</since>

# Query Parameter Modelleri { #query-parameter-models }

Birbirleriyle ilişkili bir **query parameter** grubunuz varsa, bunları tanımlamak için bir **Pydantic model** oluşturabilirsiniz.

Böylece **modeli yeniden kullanabilir**, **birden fazla yerde** tekrar tekrar kullanabilir ve tüm parametreler için validation (doğrulama) ile metadata’yı tek seferde tanımlayabilirsiniz. 😎

/// note | Not

Bu özellik FastAPI `0.115.0` sürümünden beri desteklenmektedir. 🤓

import org.jspecify.annotations.NullUnmarked;

/**
 * Tests for {@link Parameter}.
 *
 * @author Ben Yu
 */
@NullUnmarked
public class ParameterTest extends TestCase {

  public void testNulls() {
    try {
      Class.forName("java.lang.reflect.AnnotatedType");
    } catch (ClassNotFoundException runningInAndroidVm) {
      /*
       * Parameter declares a method that returns AnnotatedType, which isn't available on Android.