En particular, esta puede ser una buena alternativa a la lógica en un middleware.

Por ejemplo, si quieres leer o manipular el request body antes de que sea procesado por tu aplicación.

/// danger | Advertencia

Esta es una funcionalidad "avanzada".

Si apenas estás comenzando con **FastAPI**, quizás quieras saltar esta sección.

///

## Casos de uso { #use-cases }

INFO:     Will watch for changes in these directories: ['/home/user/code/awesomeapp']
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [2248755] using WatchFiles
INFO:     Started server process [2248757]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
```

</div>

<details markdown="1">

        // what we wanted: a new file that probably has its last modified time set to approximately
        // now. Or it could have an arbitrary last modified time set by the creator, but that's no
        // different than if another process set its last modified time to something else after we
        // created it here.
      }
    }
  }

  /**
   * Creates any necessary but nonexistent parent directories of the specified path. Note that if

次の章で具体例をいくつか紹介します。

---

次に考慮すべきコンセプトは、実際のAPIを実行するプログラム（例：Uvicorn）に関連するものすべてです。

## プログラム と プロセス { #program-and-process }

私たちは「**プロセス**」という言葉についてたくさん話すので、その意味や「**プログラム**」という言葉との違いを明確にしておくと便利です。

### プログラムとは何か { #what-is-a-program }

**プログラム**という言葉は、一般的にいろいろなものを表現するのに使われます：

* プログラマが書く**コード**、**Pythonファイル**

* the task function

* the template
* the template engine

* the type annotation
* the type hint

* the server worker
* the Uvicorn worker
* the Gunicorn Worker
* the worker process
* the worker class
* the workload

* the deployment
* to deploy

* the SDK
* the software development kit

* the `APIRouter`
* the `requirements.txt`
* the Bearer Token

                defaultReadingConverter, defaultReadingConverter, defaultNormalizer, analyzer);

        // Should convert to string and process
        // May or may not produce items depending on analyzer
        assertNotNull(items);
    }

    @Test
    public void test_parseDocument_multipleFields() throws Exception {

   *   <li>if the thread was interrupted before the SequentialExecutor's worker begins execution,
   *       the interrupt will be restored to the thread after it completes so that its {@code
   *       delegate} Executor may process the interrupt.
   *   <li>subtasks are run with the thread uninterrupted and interrupts received during execution
   *       of a task are ignored.
   * </ol>
   *

            }
            return null;
        }
        return permission;
    }

    /**
     * Decodes a search role format string back to a permission string.
     * Reverses the encoding process to restore original permission format.
     *
     * @param value the encoded permission string to decode
     * @return the decoded permission string, or null if the input is blank or invalid
     */

 *
 * This class may be used to stream very large responses. For example, it is possible to use this
 * class to read a response that is larger than the entire memory allocated to the current process.
 * It can even stream a response larger than the total storage on the current device, which is a
 * common requirement for video streaming applications.
 *

* task
* background task
* task function

* template
* template engine

* type annotation
* type hint

* server worker
* Uvicorn worker
* Gunicorn Worker
* worker process
* worker class
* workload

* deployment
* deploy etmek

* SDK
* software development kit

* `APIRouter`
* `requirements.txt`
* Bearer Token
* breaking change
* bug