## Descripción desde docstring { #description-from-docstring }

Como las descripciones tienden a ser largas y cubrir múltiples líneas, puedes declarar la descripción de la *path operation* en la <abbr title="un string de múltiples líneas como la primera expresión dentro de una función (no asignada a ninguna variable) usada para documentación">docstring</abbr> de la función y **FastAPI** la leerá desde allí.

from fastapi import FastAPI
from pydantic import BaseModel, HttpUrl

app = FastAPI()


class Image(BaseModel):
    url: HttpUrl
    name: str


@app.post("/images/multiple/")
async def create_multiple_images(images: list[Image]):

                This is useful when you want to have optional authentication.

                It is also useful when you want to have authentication that can be
                provided in one of multiple optional ways (for example, in a query
                parameter or in an HTTP Bearer token).
                """
            ),
        ] = True,
    ):
        super().__init__(

            This happens automatically when more than one `Body` parameter is declared.

            Read more about it in the
            [FastAPI docs for Body - Multiple Parameters](https://fastapi.tiangolo.com/tutorial/body-multiple-params/#embed-a-single-body-parameter).
            """
        ),
    ] = None,
    media_type: Annotated[
        str,
        Doc(
            """

# Modelos de Parámetros Query { #query-parameter-models }

Si tienes un grupo de **parámetros query** que están relacionados, puedes crear un **modelo de Pydantic** para declararlos.

Esto te permitiría **reutilizar el modelo** en **múltiples lugares** y también declarar validaciones y metadatos para todos los parámetros de una vez. 😎

/// note | Nota

Esto es compatible desde la versión `0.115.0` de FastAPI. 🤓

///

<div class="screenshot">
<img src="/img/tutorial/sql-databases/image01.png">
</div>

## Update the App with Multiple Models { #update-the-app-with-multiple-models }

Now let's **refactor** this app a bit to increase **security** and **versatility**.

 *    [proxy selector][java.net.ProxySelector] is used. It may return multiple proxies to attempt.
 *  * **IP address:** whether connecting directly to an origin server or a proxy, opening a socket
 *    requires an IP address. The DNS server may return multiple IP addresses to attempt.
 *
 * Each route is a specific selection of these options.
 */
class Route(

     */
    public void decrypt(final byte[] cipherText, final byte[] clearText) {

        decrypt(cipherText, 0, clearText, 0);
    }

    /**
     * encrypts an array where the length must be a multiple of 8
     */
    /**
     * Encrypts an 8-byte block using DES
     * @param clearText the 8-byte plaintext block
     * @return the 8-byte ciphertext block
     */

The files and form fields will be uploaded as form data and you will receive the files and form fields.

And you can declare some of the files as `bytes` and some as `UploadFile`.

/// warning

You can declare multiple `File` and `Form` parameters in a *path operation*, but you can't also declare `Body` fields that you expect to receive as JSON, as the request will have the body encoded using `multipart/form-data` instead of `application/json`.

    public void test_multipleCloseCallsDoNothing() throws IOException {
        // Test that multiple close() calls are all ignored
        byte[] data = "Test data".getBytes();
        ByteArrayInputStream underlyingStream = new ByteArrayInputStream(data);
        IgnoreCloseInputStream stream = new IgnoreCloseInputStream(underlyingStream);

        // Multiple close calls should all be ignored
        stream.close();
        stream.close();