import java.util.concurrent.Future;
import org.jspecify.annotations.Nullable;

/**
 * Transforms a value, possibly asynchronously. For an example usage and more information, see
 * {@link Futures#transformAsync(ListenableFuture, AsyncFunction, Executor)}.
 *
 * @author Chris Povirk
 * @since 11.0
 */
@GwtCompatible
public interface AsyncFunction<I extends @Nullable Object, O extends @Nullable Object> {

* <a href="https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.2.md#responsesObject" class="external-link" target="_blank">🗄 📨 🎚</a>, ⚫️ 🔌 `Response Object`.

{* ../../docs_src/app_testing/tutorial002.py hl[27:31] *}

/// note | 참고

자세한 내용은 Starlette의 <a href="https://www.starlette.io/testclient/#testing-websocket-sessions" class="external-link" target="_blank"> WebSocket 테스트</a>에 관한 설명서를 참고하시길 바랍니다.

Đối với vận hành thực tế (production), bạn sẽ sử dụng `fastapi run` thay thế. 🚀

Ở bên trong, **FastAPI CLI** sử dụng <a href="https://www.uvicorn.org" class="external-link" target="_blank">Uvicorn</a>, một server ASGI có hiệu suất cao, sẵn sàng cho vận hành thực tế (production). 😎

## `fastapi dev`

Chạy `fastapi dev` sẽ khởi động quá trình phát triển.

Büyük bulut sağlayıcıların çoğu FastAPI uygulamasını yayınlamak için kılavuzlara sahiptir.

## Bulut Sağlayıcılar - Sponsorlar

Bazı bulut sağlayıcılar ✨ [**FastAPI destekçileridir**](../help-fastapi.md#sponsor-the-author){.internal-link target=_blank} ✨, bu FastAPI ve **ekosisteminin** sürekli ve sağlıklı bir şekilde **gelişmesini** sağlar.

Ayrıca, size **iyi servisler** sağlamakla kalmayıp, **iyi ve sağlıklı bir framework** olan FastAPI'a bağlılıklarını gösterir.

package com.google.thirdparty.publicsuffix;

import com.google.common.annotations.Beta;
import com.google.common.annotations.GwtCompatible;

/**
 * <b>Do not use this class directly. For access to public-suffix information, use {@link
 * com.google.common.net.InternetDomainName}.</b>
 *
 * <p>Specifies the type of a top-level domain definition.
 *
 * @since 23.3
 */
@Beta
@GwtCompatible
public enum PublicSuffixType {

 */

package com.google.common.collect;

import java.util.Collection;
import java.util.Collections;
import java.util.Set;
import org.jspecify.annotations.Nullable;

/**
 * GWT implementation of {@link ImmutableSet} that forwards to another {@code Set} implementation.
 *
 * @author Hayward Chan
 */
@SuppressWarnings("serial") // Serialization only done in GWT.

package com.google.common.collect.testing.testers;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.testing.AbstractCollectionTester;
import org.junit.Ignore;

/**
 * Tests {@link java.util.Collection#equals}.
 *
 * @author George van den Driessche
 */
@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")

import org.junit.Ignore;

/**
 * A generic JUnit test which tests creation (typically through a constructor or static factory
 * method) of a list. Can't be invoked directly; please see {@link
 * com.google.common.collect.testing.ListTestSuiteBuilder}.
 *
 * @author Chris Povirk
 */
@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")

# Response - Change Status Code { #response-change-status-code }

You probably read before that you can set a default [Response Status Code](../tutorial/response-status-code.md){.internal-link target=_blank}.

But in some cases you need to return a different status code than the default.

## Use case { #use-case }

For example, imagine that you want to return an HTTP status code of "OK" `200` by default.