Eine „Middleware“ ist eine Funktion, die mit jedem **Request** arbeitet, bevor er von einer bestimmten *Pfadoperation* verarbeitet wird. Und auch mit jeder **Response**, bevor sie zurückgegeben wird.

* Sie nimmt jeden **Request** entgegen, der an Ihre Anwendung gesendet wird.
* Sie kann dann etwas mit diesem **Request** tun oder beliebigen Code ausführen.

  @Test
  fun executionRejectedAfterMaxRequestsChange() {
    val request1 = newRequest("http://a/1")
    val request2 = newRequest("http://a/2")
    dispatcher.maxRequests = 1
    client.newCall(request1).enqueue(callback)
    executor.shutdown()
    client.newCall(request2).enqueue(callback)
    dispatcher.maxRequests = 2 // Trigger promotion.
    callback.await(request2.url).assertFailure(InterruptedIOException::class.java)

        MockletHttpServletRequest request = getMockRequest();
        request.setParameter("geo.location.1.point", "34,150");
        request.setParameter("geo.location.1.distance", "10km");
        request.setParameter("geo.location.2.point", "35,151");
        request.setParameter("geo.location.2.distance", "1km");

        final GeoInfo geoInfo = new GeoInfo(request);
        String result =

     */
    int size();

    /**
     * Creates a cancel request for this request.
     *
     * @return create cancel request
     */
    CommonServerMessageBlockRequest createCancel();

    /**
     * Checks if chaining is allowed with the next request.
     *
     * @param next the next request in the chain
     * @return whether to allow chaining
     */

        "c6",
      ),
    )
  }

  @Test
  fun getHasCorrectResponse() {
    val request = Request(server.url("/abc"))

    val response = testBasicCachingRules(request)

    assertThat(response.request.url).isEqualTo(request.url)
    assertThat(response.cacheResponse!!.request.url).isEqualTo(request.url)
  }

  @Test
  fun postWithOverrideResponse() {

///

## Criar um middleware

Para criar um middleware, use o decorador `@app.middleware("http")` logo acima de uma função.

A função middleware recebe:

* A `request`.
* Uma função `call_next` que receberá o `request` como um parâmetro.
    * Esta função passará a `request` para a *operação de rota* correspondente.
    * Então ela retorna a `response` gerada pela *operação de rota* correspondente.

	// sets the bucket policy using the policy statement generated from `getReadOnlyBucketStatement` so that the
	// unsigned request goes through and its validated again.
	ExecObjectLayerAPIAnonTest(t, obj, "TestGetBucketLocationHandler", bucketName, "", instanceType, apiRouter, anonReq, getAnonReadOnlyBucketPolicy(bucketName))

	// HTTP request for testing when `objectLayer` is set to `nil`.

            // Initial setup
            request.setData(new byte[100], 0, 100);
            request.setOffset(1000L);
            request.setRemainingBytes(500);
            request.setWriteFlags(0x01);

            // Update parameters
            request.setData(new byte[200], 0, 200);
            request.setOffset(2000L);
            request.setRemainingBytes(1000);
            request.setWriteFlags(0x02);

    Response response = client.newCall(request).execute();
    response.body().close();
  }

  private static class LoggingInterceptor implements Interceptor {
    @Override public Response intercept(Chain chain) throws IOException {
      long t1 = System.nanoTime();
      Request request = chain.request();
      logger.info(String.format("Sending request %s on %s%n%s",
          request.url(), chain.connection(), request.headers()));

Un "middleware" es una función que trabaja con cada **request** antes de que sea procesada por cualquier *path operation* específica. Y también con cada **response** antes de devolverla.

* Toma cada **request** que llega a tu aplicación.
* Puede entonces hacer algo a esa **request** o ejecutar cualquier código necesario.
* Luego pasa la **request** para que sea procesada por el resto de la aplicación (por alguna *path operation*).