# Classes como Dependências

Antes de nos aprofundarmos no sistema de **Injeção de Dependência**, vamos melhorar o exemplo anterior.

## `dict` do exemplo anterior

No exemplo anterior, nós retornávamos um `dict` da nossa dependência ("injetável"):

{* ../../docs_src/dependencies/tutorial001_an_py310.py hl[9] *}

Mas assim obtemos um `dict` como valor do parâmetro `commons` na *função de operação de rota*.

 * It allows setting a default encoding, mapping various encoding names to preferred ones,
 * and normalizing an encoding string to its preferred form or the default if no mapping is found.
 */
public class EncodingHelper {

    /** The default encoding to use when no mapping is found */
    protected String defaultEncoding;

    /** Map of encoding names to their preferred forms */

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

## Prohibir Headers Extra

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`:

- Correct a reference to a not/no longer used kustomize subcommand in the documentation ([#82535](https://github.com/kubernetes/kubernetes/pull/82535), [@demobox](https://github.com/demobox))

    bytesIn.writeByte(0x08) // Literal value (len = 8)
    bytesIn.writeUtf8("no-cache")
  }

  private fun checkReadSecondRequestWithoutHuffman() {
    assertThat(hpackReader!!.headerCount).isEqualTo(2)

    // [  1] (s =  53) cache-control: no-cache
    var entry = hpackReader!!.dynamicTable[readerHeaderTableLength() - 2]!!
    checkEntry(entry, "cache-control", "no-cache", 53)

    // [  2] (s =  57) :authority: www.example.com

- kubeadm no longer dumps backtrace if it fails to remove the running containers on reset. ([#73951](https://github.com/kubernetes/kubernetes/pull/73951),...

    }

    @Test
    void testChannelSelection() {
        try {
            channelManager.selectChannel(mockMessage);
            fail("Should throw exception when no channels available");
        } catch (Exception e) {
            // Expected - no channels available
            assertTrue(e instanceof ChannelLoadBalancer.NoAvailableChannelException);
        }
    }

    @Test

		case errors.Is(err, errErasureReadQuorum):
			// no quorum available continue to wait for minimum number of servers.
			logger.Info("Waiting for a minimum of %d drives to come online (elapsed %s)\n",
				len(endpoints)/2, getElapsedTime())
		case errors.Is(err, errErasureWriteQuorum):
			// no quorum available continue to wait for minimum number of servers.

/**
 * Tests for SmbEndOfFileException focusing on message, status, and throwability.
 */
@ExtendWith(MockitoExtension.class)
class SmbEndOfFileExceptionTest {

    /**
     * Verifies the no-arg constructor sets the expected message, status, and no cause.
     */
    @Test
    void defaultConstructorSetsMessageAndStatus() {
        // Arrange & Act
        SmbEndOfFileException ex = new SmbEndOfFileException();

        // Assert

    # /- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    # o sourceCodeLineSeparator: (NotRequired - Default no setting)
    #  The line separator setting for source code of generated classes.
    #   LF   -> converted to LF
    #   CRLF -> converted to CRLF
    #   (no setting) -> no convert (template default is CRLF)
    #
    #; sourceCodeLineSeparator = LF
    # - - - - - - - - - -/