Recuerda que cuando importas `Query`, `Path`, y otros desde `fastapi`, en realidad son funciones que devuelven clases especiales.

///

/// tip | Consejo

Observa cómo cada atributo del modelo con un tipo, un valor por defecto y `Field` tiene la misma estructura que un parámetro de una *path operation function*, con `Field` en lugar de `Path`, `Query` y `Body`.

///

    "paid": true
}
```

y esperaría un response de esa *API externa* con un JSON body como:

```JSON
{
    "ok": true
}
```

/// tip | Consejo

Observa cómo la URL del callback utilizada contiene la URL recibida como parámetro de query en `callback_url` (`https://www.external.org/events`) y también el `id` de la factura desde dentro del JSON body (`2expen51ve`).

///

  if (output_names) {
    output_names_vec.reserve(noutputs);
    for (int i = 0; i < noutputs; ++i) {
      output_names_vec.push_back(string(output_names[i]));
    }
  }

  // Process control output names.
  std::vector<string> control_output_names_vec;
  if (control_output_names) {
    control_output_names_vec.reserve(ncontrol_outputs);
    for (int i = 0; i < ncontrol_outputs; ++i) {

  // * Future completion can be observed if the waitersField field contains a TOMBSTONE

  // Timed Get
  // There are a few design constraints to consider
  // * We want to be responsive to small timeouts, unpark() has non trivial latency overheads (I
  //   have observed 12 micros on 64-bit linux systems to wake up a parked thread). So if the

   * only become known via CAS failures, convergence can be slow,
   * and because threads are typically not bound to CPUS forever,
   * may not occur at all. However, despite these limitations,
   * observed contention rates are typically low in these cases.
   *
   * It is possible for a Cell to become unused when threads that
   * once hashed to it terminate, as well as in the case where

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3

import java.io.IOException
import java.util.concurrent.TimeUnit

/**
 * Observes, modifies, and potentially short-circuits requests going out and the corresponding
 * responses coming back in. Typically interceptors add, remove, or transform headers on the request
 * or response.
 *

  }

  @SuppressSignatureCheck
  override fun getSelectedProtocol(sslSocket: SSLSocket): String? =
    try {
      // SSLSocket.getApplicationProtocol returns "" if application protocols values will not
      // be used. Observed if you didn't specify SSLParameters.setApplicationProtocols
      when (val protocol = sslSocket.applicationProtocol) {
        null, "" -> null
        else -> protocol
      }

  // * Future completion can be observed if the waitersField field contains a TOMBSTONE

  // Timed Get
  // There are a few design constraints to consider
  // * We want to be responsive to small timeouts, unpark() has non trivial latency overheads (I
  //   have observed 12 micros on 64-bit linux systems to wake up a parked thread). So if the

      }
    }
  }

  companion object {
    val playProviderFactory: DeferredSocketAdapter.Factory =
      factory("com.google.android.gms.org.conscrypt")

    /**
     * Builds a SocketAdapter from an observed implementation class, by grabbing the Class
     * reference to perform reflection on at runtime.
     *
     * @param actualSSLSocketClass the runtime class of Conscrypt class socket.
     */

<img src="/img/tutorial/security/image07.png">

Autoriza la aplicación de la misma manera que antes.

Usando las credenciales:

Usuario: `johndoe`
Contraseña: `secret`

/// check | Revisa

Observa que en ninguna parte del código está la contraseña en texto claro "`secret`", solo tenemos la versión con hash.

///

<img src="/img/tutorial/security/image08.png">