```Python hl_lines="1"
{!../../docs_src/first_steps/tutorial001.py!}
```

`FastAPI` là một Python class cung cấp tất cả chức năng cho API của bạn.

/// note | "Chi tiết kĩ thuật"

`FastAPI` là một class kế thừa trực tiếp `Starlette`.

Bạn cũng có thể sử dụng tất cả <a href="https://www.starlette.io/" class="external-link" target="_blank">Starlette</a> chức năng với `FastAPI`.

///

 *
 * @author Emily Soldal
 * @since 14.0
 * @deprecated This class has moved to {@code com.google.common.util.concurrent}. Please use {@link
 *     com.google.common.util.concurrent.ForwardingBlockingDeque} instead.
 */
@Deprecated
@J2ktIncompatible
@GwtIncompatible
@ElementTypesAreNonnullByDefault
public abstract class ForwardingBlockingDeque<E> extends ForwardingDeque<E>
    implements BlockingDeque<E> {

import jcifs.smb.FileEntry;
import jcifs.util.Hexdump;


/**
 * 
 * @author mbechler
 *
 */
public class NetServerEnum2Response extends SmbComTransactionResponse {

    private static final Logger log = LoggerFactory.getLogger(NetServerEnum2Response.class);

    class ServerInfo1 implements FileEntry {

        String name;
        int versionMajor;
        int versionMinor;
        int type;

import org.lastaflute.web.response.JsonResponse;

import jakarta.annotation.Resource;

/**
 * @author Keiichi Watanabe
 */
public class ApiAdminDuplicatehostAction extends FessApiAdminAction {

    private static final Logger logger = LogManager.getLogger(ApiAdminDuplicatehostAction.class);

    // ===================================================================================

import org.lastaflute.web.response.render.RenderData;
import org.lastaflute.web.ruts.process.ActionRuntime;

import jakarta.annotation.Resource;

/**
 * @author shinsuke
 */
public class AdminSearchlogAction extends FessAdminAction {

    public static final String ROLE = "admin-searchlog";

    private static final String[] CONDITION_FIELDS =

// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
@SuppressWarnings("JUnit4ClassUsedInJUnit3")
@IgnoreJRERequirement // We opt into library desugaring for our tests.
public class MapComputeIfPresentTester<K, V> extends AbstractMapTester<K, V> {

  @MapFeature.Require(SUPPORTS_PUT)
  public void testComputeIfPresent_supportedAbsent() {
    assertNull(

 * {@code SerializableTester} calls with other, GWT-compatible tests.
 *
 * @author Mike Bostock
 * @since 10.0
 */
@GwtCompatible // but no-op!
@ElementTypesAreNonnullByDefault
public final class SerializableTester {
  private SerializableTester() {}

  /**
   * Serializes and deserializes the specified object.
   *
   * <p><b>GWT warning:</b> Under GWT, this method simply returns its input, as proper GWT

 * @author Louis Wasserman
 */
@GwtCompatible(emulated = true)
@ElementTypesAreNonnullByDefault
final class SortedMultisets {
  private SortedMultisets() {}

  /** A skeleton implementation for {@link SortedMultiset#elementSet}. */
  @SuppressWarnings("JdkObsolete") // TODO(b/6160855): Switch GWT emulations to NavigableSet.
  static class ElementSet<E extends @Nullable Object> extends Multisets.ElementSet<E>
      implements SortedSet<E> {

import com.squareup.moshi.Moshi
import java.io.IOException
import okhttp3.OkHttpClient
import okhttp3.Request

class ParseResponseWithMoshi {
  private val client = OkHttpClient()
  private val moshi = Moshi.Builder().build()
  private val gistJsonAdapter = moshi.adapter(Gist::class.java)

  fun run() {
    val request =
      Request.Builder()
        .url("https://api.github.com/gists/c2a7c39532239ff261be")

from fastapi.testclient import TestClient
from pydantic import BaseModel

app = FastAPI()


class SubModel(BaseModel):
    a: Optional[str] = "foo"


class Model(BaseModel):
    x: Optional[int] = None
    sub: SubModel


class ModelSubclass(Model):
    y: int
    z: int = 0
    w: Optional[int] = None


class ModelDefaults(BaseModel):
    w: Optional[str] = None
    x: Optional[str] = None