Como ejemplo, tomemos esta función:

{* ../../docs_src/python_types/tutorial009c.py hl[1,4] *}

El parámetro `name` está definido como `Optional[str]`, pero **no es opcional**, no puedes llamar a la función sin el parámetro:

```Python
say_hi()  # ¡Oh, no, esto lanza un error! 😱
```

El parámetro `name` sigue siendo **requerido** (no *opcional*) porque no tiene un valor predeterminado. Aún así, `name` acepta `None` como valor:

* `@app.get()`
* `@app.post()`
* `@app.put()`
* `@app.delete()`
* etc.

{* ../../docs_src/response_status_code/tutorial001.py hl[6] *}

/// note | Nota

Isso é possível desde a versão `0.115.0` do FastAPI. 🤓

///

## Parâmetros do Cabeçalho com um Modelo Pydantic

Declare os **parâmetros de cabeçalho** que você precisa em um **modelo do Pydantic**, e então declare o parâmetro como `Header`:

{* ../../docs_src/header_param_models/tutorial001_an_py310.py hl[9:14,18] *}

     */
    public MsExcelExtractor() {
        super();
    }

    /**
     * Extracts text from the Excel input stream.
     * @param in The input stream.
     * @param params The parameters.
     * @return The extracted data.
     */
    @Override
    public ExtractData getText(final InputStream in, final Map<String, String> params) {
        if (in == null) {

        private byte[] buffer;

        @BeforeEach
        void setUp() {
            buffer = new byte[BUFFER_SIZE];
        }

        @Test
        @DisplayName("Should create context with constructor parameters")
        void testConstructorWithParameters() {
            int[] hashAlgos = { PreauthIntegrityNegotiateContext.HASH_ALGO_SHA512 };
            byte[] salt = new byte[32];
            new SecureRandom().nextBytes(salt);

    /**
     * Sends an SMB request and returns the response
     * @param <T> the response type
     * @param request the request to send
     * @param params optional request parameters
     * @return response message
     * @throws CIFSException if an error occurs sending the request
     */

        assertNull(negotiationWithNullBuffers.getResponseRaw());
    }

    @Test
    @DisplayName("Constructor with all null parameters should work")
    void testConstructorWithAllNullParameters() {
        // Test that all null parameters are handled properly
        SmbNegotiation negotiationAllNull = new SmbNegotiation(null, null, null, null);

        assertNull(negotiationAllNull.getRequest());

// --------------------------
// This implementation of the GET operation returns some or all (up to 1000)
// of the objects in a bucket. You can use the request parameters as selection
// criteria to return a subset of the objects in a bucket.
//
// NOTE: It is recommended that this API to be used for application development.

* Documentation automatique des modèles de données avec <a href="http://json-schema.org/" class="external-link" target="_blank"><strong>JSON Schema</strong></a> (comme OpenAPI est aussi basée sur JSON Schema)....

import org.codelibs.fess.app.web.api.admin.dict.BaseSearchDictBody;

/**
 * Search request body for protected words dictionary administration.
 * Extends BaseSearchDictBody with protected words dictionary-specific search parameters.
 */
public class SearchBody extends BaseSearchDictBody {

    /**
     * Default constructor for SearchBody.
     */
    public SearchBody() {
        super();
    }