But you still need to define what is the dependable, the callable that you pass as a parameter to `Depends()` or `Security()`.

There are multiple tools that you can use to create those dependables, and they get integrated into OpenAPI so they are shown in the automatic docs UI, they can be used by automatically generated clients and SDKs, etc.

You can import them from `fastapi.security`:

```python
from fastapi.security import (

// (see https://docs.google.com/document/d/1F__vEKeI41P7PPUCMM9PVPYY34pyrvQI5rbTJVnS5c4)
func clusterUID(client kubernetes.Interface) (types.UID, error) {
	kubeSystem, err := client.CoreV1().Namespaces().Get(context.TODO(), "kube-system", metav1.GetOptions{})
	if err != nil {
		return "", err
	}
	return kubeSystem.UID, nil

    private final Map<String, SmbAuthentication> authMap = new HashMap<>();

    public void add(final SmbAuthentication auth) {
        authMap.put(auth.getPathPrefix(), auth);
    }

    public SmbAuthentication get(final String path) {
        if (path == null) {
            return null;
        }

        for (final Map.Entry<String, SmbAuthentication> entry : authMap.entrySet()) {
            if (path.startsWith(entry.getKey())) {

      return;
    }
    if (isPrimitiveOrNullable(invokable.getParameters().get(paramIndex))) {
      return; // there's nothing to test
    }
    @Nullable Object[] params = buildParamList(invokable, paramIndex);
    try {
      @SuppressWarnings("unchecked") // We'll get a runtime exception if the type is wrong.
      Invokable<Object, ?> unsafe = (Invokable<Object, ?>) invokable;

                Item lastItem = get(i);

                if (lastItem.isNull()) {
                    if (i == size() - 1 || get(i + 1).getType() == STRING_ITEM) {
                        remove(i);
                    } else if (get(i + 1).getType() == LIST_ITEM) {
                        Item item = ((ListItem) get(i + 1)).get(0);

        try {
            final RESULT result = entityType.newInstance();
            result.setCreatedAt(toLocalDateTime(source.get("createdAt")));
            result.setUpdatedAt(toLocalDateTime(source.get("updatedAt")));
            return updateEntity(source, result);
        } catch (InstantiationException | IllegalAccessException e) {

   *
   * <p>The returned list maintains the values, but not the identities, of {@code Short} objects
   * written to or read from it. For example, whether {@code list.get(0) == list.get(0)} is true for
   * the returned list is unspecified.
   *
   * <p>The returned list is serializable.
   *
   * @param backingArray the array to back the list
   * @return a list view of the array
   */

   *
   * <p>The returned list maintains the values, but not the identities, of {@code Short} objects
   * written to or read from it. For example, whether {@code list.get(0) == list.get(0)} is true for
   * the returned list is unspecified.
   *
   * <p>The returned list is serializable.
   *
   * @param backingArray the array to back the list
   * @return a list view of the array
   */

 */
@RunWith(AndroidJUnit4::class)
class ApacheHttpClientTest {
  private var httpClient = HttpClients.createDefault()

  @After fun tearDown() {
    httpClient.close()
  }

  @Test fun get() {
    val request = HttpGet("https://google.com/robots.txt")

    httpClient.execute(request).use { response ->
      assertEquals(200, response.code)
      // TODO enable ALPN later

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public final class PostString {
  public static final MediaType MEDIA_TYPE_MARKDOWN
      = MediaType.get("text/x-markdown; charset=utf-8");

  private final OkHttpClient client = new OkHttpClient();

  public void run() throws Exception {
    String postBody = ""
        + "Releases\n"
        + "--------\n"