E seu aplicativo **FastAPI** também pode ser composto de vários arquivos/módulos, etc.

### Arquivo do aplicativo **FastAPI**

Digamos que você tenha uma estrutura de arquivo conforme descrito em [Aplicativos maiores](bigger-applications.md){.internal-link target=_blank}:

```
.
├── app
│   ├── __init__.py
│   └── main.py
```

No arquivo `main.py` você tem seu aplicativo **FastAPI**:

        assertNull(exception.getCause());
    }

    public void test_constructorWithString_longMessage() {
        // Test with a long message
        String message = "This is a very long error message that describes in detail why the job was not found. "
                + "The job with identifier XYZ123 was expected to be in the system but could not be located "

      parseException.initCause(e);
      throw parseException;
    }
  }

  /**
   * Determines whether {@code specifier} represents a valid {@link HostSpecifier} as described in
   * the documentation for {@link #fromValid(String)}.
   */
  public static boolean isValid(String specifier) {
    try {
      HostSpecifier unused = fromValid(specifier);
      return true;

import javax.net.ssl.SSLSession
import okhttp3.internal.toImmutableList

/**
 * A record of a TLS handshake. For HTTPS clients, the client is *local* and the remote server is
 * its *peer*.
 *
 * This value object describes a completed handshake. Use [ConnectionSpec] to set policy for new
 * handshakes.
 */
class Handshake internal constructor(
  /**

   * that they were not initialized yet.
   */
  private static final int SUFFIX_NOT_INITIALIZED = -2;

  /**
   * Maximum parts (labels) in a domain name. This value arises from the 255-octet limit described
   * in <a href="http://www.ietf.org/rfc/rfc2181.txt">RFC 2181</a> part 11 with the fact that the
   * encoding of each part occupies at least two bytes (dot plus label externally, length byte plus

Pero aquí está el punto clave.

El tema de seguridad e inyección de dependencias se escribe una vez.

Y puedes hacerlo tan complejo como desees. Y aún así, tenerlo escrito solo una vez, en un solo lugar. Con toda la flexibilidad.

        }
    }

    /**
     * An application extending this class must provide an implementation for this method that returns new user credentials try try when accessing SMB resources described by the <code>getRequestingURL</code> and <code>getRequestingException</code> methods.

## Retornando uma `Response` diretamente

Você também pode criar cookies ao retornar uma `Response` diretamente no seu código.

Para fazer isso, você pode criar uma resposta como descrito em [Retornando uma Resposta Diretamente](response-directly.md){.internal-link target=_blank}.

Então, defina os cookies nela e a retorne:

{* ../../docs_src/response_cookies/tutorial001.py hl[10:12] *}

/// tip | Dica

   *
   * @param minimumBits a positive integer. This can be arbitrarily large. The returned {@link
   *     HashFunction} instance may use memory proportional to this integer.
   * @return a hash function, described above, that produces hash codes of length {@code
   *     minimumBits} or greater
   */
  public static HashFunction goodFastHash(int minimumBits) {
    int bits = checkPositiveAndMakeMultipleOf32(minimumBits);

     *
     * @return textual representation of type
     */
    String getTypeText();

    /**
     * Returns the type of this SID indicating the state or type of account.
     * <p>
     * SID types are described in the following table.
     * <table>
     * <caption>Type codes</caption>
     * <tr>
     * <th>Type</th>
     * <th>Name</th>
     * </tr>
     * <tr>
     * <td>SID_TYPE_USE_NONE</td>