You could create an API with a *path operation* that could trigger a request to an *external API* created by someone else (probably the same developer that would be *using* your API).

The process that happens when your API app calls the *external API* is named a "callback". Because the software that the external developer wrote sends a request to your API and then your API *calls back*, sending a request to an *external API* (that was probably created by the same developer).

poderia criar uma API com uma *operação de rota* que poderia acionar um request a uma *API externa* criada por outra pessoa (provavelmente o mesmo desenvolvedor que estaria *usando* sua API).

O processo que acontece quando sua aplicação de API chama a *API externa* é chamado de "callback". Porque o software que o desenvolvedor externo escreveu envia um request para sua API e então sua API *chama de volta*, enviando um request para uma *API externa* (que provavelmente foi criada pelo mesmo desenvolvedor)....

    params=[
        pytest.param("tutorial002_py310", marks=needs_py310),
        pytest.param("tutorial002_an_py310", marks=needs_py310),
    ],
)
def get_client(request: pytest.FixtureRequest):
    mod = importlib.import_module(f"docs_src.background_tasks.{request.param}")

    client = TestClient(mod.app)
    return client


@workdir_lock
def test(client: TestClient):
    log = Path("log.txt")
    if log.is_file():

///

## 미들웨어 만들기 { #create-a-middleware }

미들웨어를 만들기 위해 함수 상단에 데코레이터 `@app.middleware("http")`를 사용합니다.

미들웨어 함수는 다음을 받습니다:

* `request`.
* `request`를 매개변수로 받는 `call_next` 함수.
    * 이 함수는 `request`를 해당하는 *경로 처리*로 전달합니다.
    * 그런 다음 해당 *경로 처리*가 생성한 `response`를 반환합니다.
* 그런 다음 반환하기 전에 `response`를 추가로 수정할 수 있습니다.

{* ../../docs_src/middleware/tutorial001_py310.py hl[8:9,11,14] *}

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcifs.internal.smb2.rdma;

import jcifs.internal.util.SMBUtil;

/**
 * SMB Direct Negotiate Request message.
 *
 * As per MS-SMBD 2.2.1 - SMB_DIRECT_NEGOTIATE_REQUEST
 * This message is sent to negotiate SMB Direct protocol parameters.
 */
public class SmbDirectNegotiateRequest {

    // Protocol constants

- 建立一個可重複使用的 `templates` 物件。
- 在會回傳模板的「*路徑操作（path operation）*」中宣告一個 `Request` 參數。
- 使用你建立的 `templates` 來渲染並回傳 `TemplateResponse`，傳入模板名稱、`request` 物件，以及在 Jinja2 模板中使用的「context」鍵值對字典。

{* ../../docs_src/templates/tutorial001_py310.py hl[4,11,15:18] *}

/// note

在 FastAPI 0.108.0、Starlette 0.29.0 之前，`name` 是第一個參數。

此外，在更早的版本中，`request` 物件是作為 context 的鍵值對之一傳給 Jinja2 的。

///

/// tip

import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.ResponseBody;
import okio.Buffer;
import okio.BufferedSource;
import okio.ForwardingSource;
import okio.Okio;
import okio.Source;

public final class Progress {

  public void run() throws Exception {
    Request request = new Request.Builder()
        .url("https://publicobject.com/helloworld.txt")

  }

  @CollectionFeature.Require(ALLOWS_NULL_VALUES)
  @CollectionSize.Require(absent = ZERO)
  public void testSpliteratorNullable() {
    initCollectionWithNullElement();
    assertFalse(collection.spliterator().hasCharacteristics(Spliterator.NONNULL));
  }

  @CollectionFeature.Require(SUPPORTS_ADD)
  public void testSpliteratorNotImmutable_collectionAllowsAdd() {
    // If add is supported, verify that IMMUTABLE is not reported.

      }
    }
  }

  @CollectionSize.Require(ZERO)
  public void testEmptySetFirst() {
    assertThrows(NoSuchElementException.class, () -> sortedSet.first());
  }

  @CollectionSize.Require(ZERO)
  public void testEmptySetLast() {
    assertThrows(NoSuchElementException.class, () -> sortedSet.last());
  }

  @CollectionSize.Require(ONE)
  public void testSingletonSetFirst() {

     *
     * @param request The repository request from which this cache was retrieved, must not be {@code null}.
     * @param key The key to use associate the data with, must not be {@code null}.
     * @param data The data to store in the cache, may be {@code null}.
     */
    void put(RepositoryRequest request, Object key, Object data);

    /**