*/
    private final String simpleMessage;

    /**
     * Creates {@link ClRuntimeException}.
     *
     * @param messageCode message code
     */
    public ClRuntimeException(final String messageCode) {
        this(messageCode, new Object[0], null);
    }

    /**
     * Creates {@link ClRuntimeException}.
     *
     * @param messageCode message code

    private List<Server> servers;

    private List<Proxy> proxies;

    /**
     * Creates an empty request.
     */
    public DefaultSettingsDecryptionRequest() {
        // does nothing
    }

    /**
     * Creates a new request to decrypt the specified settings.
     *
     * @param settings The settings to decrypt, must not be {@code null}.
     */

    return emptySet();
  }

  public Test testsForEmptySet() {
    return SetTestSuiteBuilder.using(
            new TestStringSetGenerator() {
              @Override
              public Set<String> create(String[] elements) {
                return emptySet();
              }
            })
        .named("emptySet")
        .withFeatures(CollectionFeature.SERIALIZABLE, CollectionSize.ZERO)

  private val moshiConverterFactory = MoshiConverterFactory.create(moshi)

  private val retrofit =
    Retrofit
      .Builder()
      .baseUrl(SslLabsApi.BASE_URL)
      .addConverterFactory(moshiConverterFactory)
      .callFactory(callFactory)
      .build()

  private val sslLabsApi = retrofit.create(SslLabsApi::class.java)

  suspend fun clients(): List<Client> =

import org.jspecify.annotations.NullMarked;

/**
 * Create integer sets for collection tests.
 *
 * @author Gregory Kick
 */
@GwtCompatible
@NullMarked
public abstract class TestIntegerSetGenerator implements TestSetGenerator<Integer> {
  @Override
  public SampleElements<Integer> samples() {
    return new Ints();
  }

  @Override
  public Set<Integer> create(Object... elements) {

 *
 * Usually you will want to create one context per client configuration and then
 * multiple sub-contexts using different credentials (if necessary).
 *
 * {@link #withDefaultCredentials()}, {@link #withAnonymousCredentials()}, {@link #withCredentials(Credentials)}
 * allow to create such sub-contexts.
 *
 *

    }

    /**
     * Helper method to create a factory with specific settings
     */
    private <U> CrawlerPooledObjectFactory<U> createFactory(String componentName) {
        CrawlerPooledObjectFactory<U> f = new CrawlerPooledObjectFactory<>();
        f.setCrawlerContainer(container);
        f.setComponentName(componentName);
        return f;
    }

    /**
     * Helper method to create a factory with listener
     */

///

### Step 2: create a `FastAPI` "instance" { #step-2-create-a-fastapi-instance }

{* ../../docs_src/first_steps/tutorial001_py39.py hl[3] *}

Here the `app` variable will be an "instance" of the class `FastAPI`.

This will be the main point of interaction to create all your API.

### Step 3: create a *path operation* { #step-3-create-a-path-operation }

#### Path { #path }

        void testPropertiesOrderPreservedInImmutableModel() {
            // Create properties with specific insertion order using LinkedHashMap
            Map<String, String> orderedMap = new LinkedHashMap<>();
            orderedMap.put("third", "3");
            orderedMap.put("first", "1");
            orderedMap.put("second", "2");

            // Create model and set properties
            Model model = new Model();

Make sure you create a [virtual environment](../virtual-environments.md){.internal-link target=_blank}, activate it, and then install it, for example:

```console
$ pip install httpx
```

///

Import `TestClient`.

Create a `TestClient` by passing your **FastAPI** application to it.