### Step 1: import `FastAPI`

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

`FastAPI` is a Python class that provides all the functionality for your API.

/// note | "Technical Details"

`FastAPI` is a class that inherits directly from `Starlette`.

You can use all the <a href="https://www.starlette.io/" class="external-link" target="_blank">Starlette</a> functionality with `FastAPI` too.

///

  }

  private interface Sample {
    String sleepThenReturnInput(String input);

    void sleepThenThrowException() throws SampleException;
  }

  @SuppressWarnings("serial")
  private static class SampleException extends Exception {}

  @SuppressWarnings("serial")
  private static class SampleRuntimeException extends RuntimeException {}

    assertEquals(0, Defaults.defaultValue(long.class).longValue());
    assertEquals(0.0f, Defaults.defaultValue(float.class).floatValue());
    assertThat(Defaults.defaultValue(double.class).doubleValue()).isEqualTo(0.0d);
    assertNull(Defaults.defaultValue(void.class));
    assertNull(Defaults.defaultValue(String.class));
  }

        .createTestSuite();
  }

  @SuppressWarnings("rawtypes") // class literals
  @Override
  protected List<Class<? extends AbstractTester>> getTesters() {
    List<Class<? extends AbstractTester>> testers = copyToList(super.getTesters());
    testers.add(NavigableSetNavigationTester.class);
    return testers;
  }

@GwtIncompatible
@J2ktIncompatible
@ElementTypesAreNonnullByDefault
abstract class DummyProxy {

  /**
   * Returns a new proxy for {@code interfaceType}. Proxies of the same interface are equal to each
   * other if the {@link DummyProxy} instance that created the proxies are equal.
   */
  final <T> T newProxy(TypeToken<T> interfaceType) {
    Set<Class<?>> interfaceClasses = Sets.newLinkedHashSet();

    return delegate!!.valueNames
  }

  @Throws(SSLPeerUnverifiedException::class)
  override fun getPeerCertificates(): Array<Certificate>? {
    return delegate!!.peerCertificates
  }

  override fun getLocalCertificates(): Array<Certificate>? {
    return delegate!!.localCertificates
  }

  @Throws(SSLPeerUnverifiedException::class)
  override fun getPeerCertificateChain(): Array<X509Certificate> {

import org.codelibs.core.misc.LocaleUtil;

/**
 * @author shot
 *
 */
public class NumberConversionUtilTest extends TestCase {

    /**
     * @throws Exception
     */
    public void testConvertNumber_byte() throws Exception {
        assertEquals(new Byte("1"), NumberConversionUtil.convertNumber(Byte.class, "1"));
    }

    /**
     * @throws Exception
     */

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.hasItems;

class FileToRawModelMergerTest {

    /**
     * Ensures that all list-merge methods are overridden
     */
    @Test
    void testOverriddenMergeMethods() {
        List<String> methodNames = Stream.of(MavenMerger.class.getDeclaredMethods())
                .filter(m -> m.getName().startsWith("merge"))
                .filter(m -> {

## Version 3.1.0

_2016-02-06_

 *  New: WebSockets now defer some writes. This should improve performance for
    some applications.
 *  New: Override `equals()` and `hashCode()` in our new cookie class. This
    class now defines equality by value rather than by reference.
 *  New: Handle 408 responses by retrying the request. This allows servers to
    direct clients to retry rather than failing permanently.

 * @since 2.0
 */
@GwtCompatible(emulated = true)
@J2ktIncompatible
@ElementTypesAreNonnullByDefault
public final class EnumBiMap<K extends Enum<K>, V extends Enum<V>> extends AbstractBiMap<K, V> {
  /*
   * J2CL's EnumMap does not need the Class instance, so we can use Object.class instead. (Or we
   * could use null, but that messes with our nullness checking, including under J2KT. We could