//   (might be multiple if there are multiple containers not restricted
  //   by the 'containerName' field) is not in the set of specified values.
  // Additional values are considered to be added in the future. Clients should
  // react to an unknown operator by assuming the requirement is not satisfied.
  optional string operator = 2;

  // Specifies the set of values. Each returned container exit code (might be

Es gibt dutzende Alternativen, die alle auf OpenAPI basieren. Sie können jede dieser Alternativen problemlos zu Ihrer mit **FastAPI** erstellten Anwendung hinzufügen.

Ebenfalls können Sie es verwenden, um automatisch Code für Clients zu generieren, die mit Ihrer API kommunizieren. Zum Beispiel für Frontend-, Mobile- oder IoT-Anwendungen.

## Rückblick, Schritt für Schritt

### Schritt 1: Importieren von `FastAPI`

```Python hl_lines="1"

import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Tests for {@link Quantiles}.
 *
 * @author Pete Gillin
 */
public class QuantilesTest extends TestCase {

  /*
   * Since Quantiles provides a fluent-style API, each test covers a chain of methods resulting in
   * the computation of one or more quantiles (or in an error) rather than individual methods. The
   * tests are divided into three sections:

Na verdade é comum utilizar Requests *dentro* de uma aplicação FastAPI.

Ainda assim, FastAPI pegou alguma inspiração do Requests.

**Requests** é uma biblioteca para interagir com APIs (como um cliente), enquanto **FastAPI** é uma biblioteca para *construir* APIs (como um servidor).

Eles estão, mais ou menos, em pontas opostas, um complementando o outro.

And there are dozens of alternatives, all based on OpenAPI. You could easily add any of those alternatives to your application built with **FastAPI**.

You could also use it to generate code automatically, for clients that communicate with your API. For example, frontend, mobile or IoT applications.

## Recap, step by step

### Step 1: import `FastAPI`

{* ../../docs_src/first_steps/tutorial001.py hl[1] *}

pported){var n=function(t){e._pointerEvent&&ht[t.originalEvent.pointerType.toUpperCase()]?e.touchStartX=t.originalEvent.clientX:e._pointerEvent||(e.touchStartX=t.originalEvent.touches[0].clientX)},i=function(t){e._pointerEvent&&ht[t.originalEvent.pointerType.toUpperCase()]&&(e.touchDeltaX=t.originalEvent.clientX-e.touchStartX),e._handleSwipe(),"hover"===e._config.pause&&(e.pause(),e.touchTimeout&&clearTimeout(e.touchTimeout),e.touchTimeout=setTimeout(function(t){return e.cycle(t)},500+e._config....

 * used; or if the class exposes a public parameter-less constructor then it will be "new"d and
 * returned.
 *
 * <p>All default instances returned by {@link #get} are generics-safe. Clients won't get type
 * errors for using {@code get(Comparator.class)} as a {@code Comparator<Foo>}, for example.
 * Immutable empty instances are returned for collection types; {@code ""} for string; {@code 0} for

                        iterator.remove();
                        notified = true;

                    }
                    if ( notified ) {
                        log.debug("Notified clients");
                    }
                    else {
                        log.debug("Exception without a request pending", ex);
                    }
                    return;
                }

import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A {@link ListenableFuture} that supports fluent chains of operations. For example:
 *
 * <pre>{@code
 * ListenableFuture<Boolean> adminIsLoggedIn =
 *     FluentFuture.from(usersDatabase.getAdminUser())
 *         .transform(User::getId, directExecutor())

	// S3 also supports the older SelectObjectContentRequest tag,
	// though it is no longer found in documentation. This is
	// checked and renamed below to allow older clients to also
	// work.
	if start.Name.Local == legacyXMLName {
		start.Name = xml.Name{Space: "", Local: "SelectRequest"}
	}

	// Make subtype to avoid recursive UnmarshalXML().
	type subS3Select S3Select