try {
            negotiate( port, resp );
        } catch( ConnectException ce ) {
            // Try an alternate port if there was an issue communicating to the server
            // Only set the alternate port to the port property if it was successful
            int altPort = (port == 0 || port == DEFAULT_PORT) ? 139 : DEFAULT_PORT;
            negotiate( altPort, resp );

                    alt++;
                } else if( line.startsWith( "#END_ALTERNATE" ) && alt > 0 ) {
                    alt--;
                    throw new IOException( "no lmhosts alternate includes loaded" );
                }
            } else if( Character.isDigit( line.charAt( 0 ))) {
                char[] data = line.toCharArray();
                int ip, i, j;
                Name name;

   * agreement between sender and recipient of data.
   *
   * @since 8.0
   */
  public static final byte LF = 10;

  /**
   * Alternate name for {@link #LF}. ({@code LF} is preferred.)
   *
   * @since 8.0
   */
  public static final byte NL = 10;

  /**

![Swagger UI](https://fastapi.tiangolo.com/img/index/index-01-swagger-ui-simple.png)

### Alternative API-Dokumentation

Gehen Sie nun auf <a href="http://127.0.0.1:8000/redoc" class="external-link" target="_blank">http://127.0.0.1:8000/redoc</a>.

Dort sehen Sie die alternative, automatische Dokumentation (bereitgestellt durch <a href="https://github.com/Rebilly/ReDoc" class="external-link" target="_blank">ReDoc</a>):

![Swagger UI](https://fastapi.tiangolo.com/img/index/index-01-swagger-ui-simple.png)

### Documentación alternativa de la API

Ahora, dirígete a <a href="http://127.0.0.1:8000/redoc" class="external-link" target="_blank">http://127.0.0.1:8000/redoc</a>.

Aquí verás la documentación automática alternativa (proveída por <a href="https://github.com/Rebilly/ReDoc" class="external-link" target="_blank">ReDoc</a>):

///

## Beneficios basados en estándares, documentación alternativa

Debido a que el schema generado es del estándar <a href="https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.2.md" class="external-link" target="_blank">OpenAPI</a> hay muchas herramientas compatibles.

![Swagger UI](https://fastapi.tiangolo.com/img/index/index-01-swagger-ui-simple.png)

### Documentation alternative

Ensuite, rendez-vous sur <a href="http://127.0.0.1:8000/redoc" class="external-link" target="_blank">http://127.0.0.1:8000/redoc</a>.

Vous y verrez la documentation alternative (via <a href="https://github.com/Rebilly/ReDoc" class="external-link" target="_blank">ReDoc</a>) :

![Swagger UI](https://fastapi.tiangolo.com/img/index/index-01-swagger-ui-simple.png)

### Documentação Alternativa de APIs

E agora, vá para <a href="http://127.0.0.1:8000/redoc" class="external-link" target="_blank">http://127.0.0.1:8000/redoc</a>.

Você verá a documentação alternativa automática (fornecida por <a href="https://github.com/Rebilly/ReDoc" class="external-link" target="_blank">ReDoc</a>):

        Cell a = as[i];
        if (a != null) sum += a.value;
      }
    }
    return sum;
  }

  /**
   * Resets variables maintaining the sum to zero. This method may be a useful alternative to
   * creating a new adder, but is only effective if there are no concurrent updates. Because this
   * method is intrinsically racy, it should only be used when it is known that no threads are
   * concurrently updating.

```

////

//// tab | Python 3.8+

```Python hl_lines="1  4"
{!> ../../docs_src/python_types/tutorial009.py!}
```

////

//// tab | Python 3.8+ alternative

```Python hl_lines="1  4"
{!> ../../docs_src/python_types/tutorial009b.py!}
```

////

#### Utilizando `Union` ou `Optional`