## Gérer les encodages personnalisés du corps de la requête { #handling-custom-request-body-encodings }

Voyons comment utiliser une sous-classe personnalisée de `Request` pour décompresser des requêtes gzip.

Et une sous-classe d'`APIRoute` pour utiliser cette classe de requête personnalisée.

### Créer une classe `GzipRequest` personnalisée { #create-a-custom-gziprequest-class }

/// tip | Astuce

    /**
     * Constructs a new exception with the specified message and cause.
     * This constructor creates an empty problem collector.
     *
     * @param message the detail message
     * @param cause the cause of this exception
     */
    public MavenBuilderException(String message, Throwable cause) {
        super(message, cause);
        problems = ProblemCollector.empty();
    }

    /**

    private final String projectId;

    public ProjectBuildFailureException(String projectId, MojoFailureException cause) {
        super("Build for project: " + projectId + " failed during execution of mojo.", cause);

        this.projectId = projectId;
    }

    public MojoFailureException getMojoFailureException() {
        return (MojoFailureException) getCause();
    }

This can save everyone a lot of time and frustration.

For any non-trivial change, we need to be able to answer these questions:

* Why is this change done? What's the use case?
* For user-facing features, what will the API look like?
* What test cases should it have? What could go wrong?

  static void awaitWaiting(Thread t) {
    while (true) {
      Thread.State state = t.getState();
      switch (state) {
        case RUNNABLE:
        case BLOCKED:
          Thread.yield();
          break;
        case WAITING:
          return;
        default:
          throw new AssertionError("unexpected state: " + state);
      }
    }
  }

Vamos ver como usar uma subclasse personalizada de `Request` para descomprimir requisições gzip.

E uma subclasse de `APIRoute` para usar essa classe de requisição personalizada.

### Criar uma classe `GzipRequest` personalizada { #create-a-custom-gziprequest-class }

/// tip | Dica

	switch valueAddr.Type {
	case obj.TYPE_CONST:
		switch sz {
		case 1, 2, 4, 8:
			nameAddr.Sym.WriteInt(p.ctxt, nameAddr.Offset, sz, valueAddr.Offset)
		default:
			p.errorf("bad int size for DATA argument: %d", sz)
		}
	case obj.TYPE_FCONST:
		switch sz {
		case 4:
			nameAddr.Sym.WriteFloat32(p.ctxt, nameAddr.Offset, float32(valueAddr.Val.(float64)))
		case 8:

				switch test.fault {
				case MissingContentLength:
					req.ContentLength = -1
					// Setting the content length to a value greater than the max allowed size of a part.
					// Used in test case  4.
				case TooBigObject:
					req.ContentLength = globalMaxObjectSize + 1
					// Malformed signature.
					// Used in test case  6.
				case BadSignature:

 * static factory method. Neither are semantics of mutation methods such as {@code
 * someList.add(obj)} checked. For more detailed discussion of supported and unsupported cases, see
 * {@link #testEquals}, {@link #testNulls} and {@link #testSerializable}.
 *
 * <p>For testing against the returned instances from a static factory class, such as
 *
 * <pre>
 * interface Book {...}

	// metacacheSharePrefix controls whether prefixes on dirty paths are always shared.
	// This will make `test/a` and `test/b` share listings if they are concurrent.
	// Enabling this will make cache sharing more likely and cause less IO,
	// but may cause additional latency to some calls.
	metacacheSharePrefix = false
)

//go:generate msgp -file $GOFILE -unexported

// metacache contains a tracked cache entry.
type metacache struct {