`app.add_middleware()` recibe una clase de middleware como primer argumento y cualquier argumento adicional que se le quiera pasar al middleware.

## Middlewares integrados { #integrated-middlewares }

**FastAPI** incluye varios middlewares para casos de uso común, veremos a continuación cómo usarlos.

/// note | Detalles Técnicos

Para los próximos ejemplos, también podrías usar `from starlette.middleware.something import SomethingMiddleware`.

            assertNotNull(msg);
            assertTrue(msg instanceof samr.SamrConnect2);
            assertTrue(msg instanceof DcerpcMessage);
        }
    }

    @Nested
    @DisplayName("Edge case handling")
    class EdgeCases {

        @Test
        @DisplayName("should handle null system name")
        void testNullSystemNameDoesNotThrow() {
            // Arrange

    exit 1
  fi
  target_file=$(echo "$url" | sed -e "s#^file:/*#/#g")
  # Build format hint from MIME type for better ImageMagick compatibility
  format_hint=""
  case "${mimetype}" in
    "image/gif")  format_hint="gif:" ;;
    "image/tiff") format_hint="tiff:" ;;
    "image/png")  format_hint="png:" ;;
    "image/jpeg") format_hint="jpeg:" ;;

# Webhooks de OpenAPI { #openapi-webhooks }

Hay casos donde quieres decirle a los **usuarios** de tu API que tu aplicación podría llamar a *su* aplicación (enviando una request) con algunos datos, normalmente para **notificar** de algún tipo de **evento**.

Esto significa que en lugar del proceso normal de tus usuarios enviando requests a tu API, es **tu API** (o tu aplicación) la que podría **enviar requests a su sistema** (a su API, su aplicación).

 * {@link
 * com.google.common.collect.testing.FeatureSpecificTestSuiteBuilder#withFeatures(Feature...)}),
 * this annotation specifies each of the different sizes for which a test suite should be built. (In
 * a typical case, the features should include {@link CollectionSize#ANY}.) These semantics are thus
 * a little different from those of other Collection-related features such as {@link
 * CollectionFeature} or {@link SetFeature}.
 *

    /*
     * For example, if concentration=2.0, the following takes the square root of
     * the uniformly-distributed random integer, then truncates any fractional
     * part, so higher integers would appear (in this case linearly) more often
     * than lower ones.
     */
    return (int) Math.pow(a, 1.0 / concentration);
  }

  @AfterExperiment
  void tearDown() {
    double req = requests.get();

         * it will be reported as "external". It is up to developer to correctly interpret output (GAV) of issues
         * and realize that in this case he wears two hats:" "user" and "(plugin) developer".
         */
        EXTERNAL
    }

    /**
     * Reports plugin issues applicable to the plugin as a whole.
     * <p>

 * the symmetry of {@code equals}. Custom definitions of equality are usually based on an interface,
 * such as {@code Set} or {@code List}, so that the implementation of {@code equals} can cast the
 * object being tested for equality to the custom interface. {@code ForwardingObject} implements no
 * such custom interfaces directly; they are implemented only in subclasses. Therefore, forwarding

 *
 * @author Kurt Alfred Kluever
 */
@NullUnmarked
public class HttpHeadersTest extends TestCase {

  public void testConstantNameMatchesString() throws Exception {
    // Special case some of the weird HTTP Header names...
    ImmutableBiMap<String, String> specialCases =
        ImmutableBiMap.<String, String>builder()
            .put("CDN_LOOP", "CDN-Loop")
            .put("ETAG", "ETag")

 * {@link
 * com.google.common.collect.testing.FeatureSpecificTestSuiteBuilder#withFeatures(Feature...)}),
 * this annotation specifies each of the different sizes for which a test suite should be built. (In
 * a typical case, the features should include {@link CollectionSize#ANY}.) These semantics are thus
 * a little different from those of other Collection-related features such as {@link
 * CollectionFeature} or {@link SetFeature}.
 *