import java.util.List;
import java.util.Map;

import org.codelibs.core.beans.Converter;
import org.codelibs.core.beans.converter.DateConverter;
import org.codelibs.core.beans.converter.NumberConverter;
import org.codelibs.core.beans.converter.SqlDateConverter;
import org.codelibs.core.beans.converter.TimeConverter;
import org.codelibs.core.beans.converter.TimestampConverter;
import org.codelibs.core.convert.DateConversionUtil;

    ]
}
```

## Recap { #recap }

Declare headers with `Header`, using the same common pattern as `Query`, `Path` and `Cookie`.

```

## Désactiver convert_underscores { #disable-convert-underscores }

Comme pour les paramètres d'en-tête classiques, lorsque vous avez des caractères de soulignement dans les noms de paramètres, ils sont **automatiquement convertis en tirets**.

Par exemple, si vous avez un paramètre d'en-tête `save_data` dans le code, l'en-tête HTTP attendu sera `save-data`, et il apparaîtra ainsi dans la documentation.

En muchos casos, probablemente ya conozcas la respuesta a esas preguntas. 🤓

Si estás ayudando mucho a la gente con sus preguntas, te convertirás en un [FastAPI Expert](fastapi-people.md#fastapi-experts) oficial. 🎉

        return result;
    }

    @Override
    public String toString() {
        return getModelId() + " " + getLocation();
    }

    /**
     * Converts this compat model InputSource to an API model InputSource.
     * This method is used for converting between the compat model and the API model.
     *
     * @return the equivalent API model InputSource
     */

## Converter qualquer dado para compatível com JSON { #convert-any-data-to-json-compatible }

Para converter qualquer dado para um formato compatível com JSON, leia a documentação de [Tutorial - Codificador Compatível com JSON](../tutorial/encoder.md).

{"item_id":3}
```

/// check

Notice that the value your function received (and returned) is `3`, as a Python `int`, not a string `"3"`.

So, with that type declaration, **FastAPI** gives you automatic request <dfn title="converting the string that comes from an HTTP request into Python data">"parsing"</dfn>.

///

## Data validation { #data-validation }

It would also mean that if you get data from the `Request` object directly (for example, read the body) it won't be validated, converted or documented (with OpenAPI, for the automatic API user interface) by FastAPI.

Although any other parameter declared normally (for example, the body with a Pydantic model) would still be validated, converted, annotated, etc.

But there are specific cases where it's useful to get the `Request` object.

 * This class provides methods for converting binary data to readable hex format.
 */

public class Hexdump {

    /**
     * Default constructor.
     */
    public Hexdump() {
        // Utility class - no instance variables to initialize
    }

    /**
     * Array of hexadecimal digit characters used for converting binary data to hex representation.
     */

Por ejemplo, no recibe objetos `datetime`, ya que no son compatibles con JSON.

Entonces, un objeto `datetime` tendría que ser convertido a un `str` que contenga los datos en [formato ISO](https://en.wikipedia.org/wiki/ISO_8601).

De la misma manera, esta base de datos no recibiría un modelo de Pydantic (un objeto con atributos), solo un `dict`.

Puedes usar `jsonable_encoder` para eso.