<div class="screenshot">
<img src="/img/tutorial/header-param-models/image01.png">
</div>

## Prohibir Headers Extra { #forbid-extra-headers }

En algunos casos de uso especiales (probablemente no muy comunes), podrías querer **restringir** los headers que deseas recibir.

Puedes usar la configuración del modelo de Pydantic para `prohibir` cualquier campo `extra`:

///

/// warning | Advertencia

Puedes declarar múltiples parámetros `Form` en una *path operation*, pero no puedes también declarar campos `Body` que esperas recibir como JSON, ya que el request tendrá el body codificado usando `application/x-www-form-urlencoded` en lugar de `application/json`.

Esto no es una limitación de **FastAPI**, es parte del protocolo HTTP.

///

## Recapitulación { #recap }

     *         no versions matched the requested range.
     */
    @Nonnull
    List<Version> getVersions();

    /**
     * Gets the lowest version matching the requested range.
     *
     * @return An Optional containing the lowest matching version, or empty Optional if no versions
     *         matched the requested range
     */
    @Nonnull

   * @since 15.0
   */
  void awaitRunning();

  /**
   * Waits for the {@link Service} to reach the {@linkplain State#RUNNING running state} for no more
   * than the given time.
   *
   * @param timeout the maximum time to wait
   * @throws TimeoutException if the service has not reached the given state within the deadline

    placeholder: ex,. tf 2.8 validations: required: true

-   type: dropdown id: Code attributes: label: Custom Code description:
    options: - "Yes" - "No" validations: required: true

-   type: input id: OS attributes: label: OS Platform and Distribution
    description: placeholder: e.g., Linux Ubuntu 16.04 validations: required:
    false

   * proxy server can issue an auth challenge and then close the connection.
   *
   * @return the next plan to attempt, or null if no further attempt should be made either because
   *     we've successfully connected or because no further attempts should be made.
   */
  @Throws(IOException::class)
  internal fun connectTunnel(): ConnectResult {
    val nextTunnelRequest =
      createTunnel()

</div>

/// tip | Consejo

A veces, podrías obtener un error **`No module named pip`** al intentar actualizar pip.

Si esto pasa, instala y actualiza pip usando el siguiente comando:

<div class="termy">

```console
$ python -m ensurepip --upgrade

---> 100%
```

</div>

calling into Go code from C will enable DIT, and disable it before returning to
C if it was not enabled when Go code was entered.
This currently only affects arm64 programs. For all other platforms it is a no-op.

Go 1.24 removed the `x509sha1` setting.  `crypto/x509` no longer supports verifying
signatures on certificates that use SHA-1 based signature algorithms.

Go 1.24 changes the default value of the [`x509usepolicies`

# FastAPI and friends newsletter

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        raise HTTPException(status_code=400, detail="X-Token header invalid")


async def get_query_token(token: str):
    if token != "jessica":