await do_stuff()
```

When you create a context manager or an async context manager like above, what it does is that, before entering the `with` block, it will execute the code before the `yield`, and after exiting the `with` block, it will execute the code after the `yield`.

In our code example above, we don't use it directly, but we pass it to FastAPI for it to use it.

        Executors.newSingleThreadScheduledExecutor(new ThreadFactoryImpl());
    // Add a listener to shut down the executor after the service is stopped. This ensures that the
    // JVM shutdown will not be prevented from exiting after this service has stopped or failed.
    // Technically this listener is added after start() was called so it is a little gross, but it

        Executors.newSingleThreadScheduledExecutor(new ThreadFactoryImpl());
    // Add a listener to shut down the executor after the service is stopped. This ensures that the
    // JVM shutdown will not be prevented from exiting after this service has stopped or failed.
    // Technically this listener is added after start() was called so it is a little gross, but it

      }
    }
    connection.writePing()
    connection.shutdown(ErrorCode.PROTOCOL_ERROR)
    assertThat(connection.openStreamCount()).isEqualTo(1)
    connection.awaitPong() // Prevent the peer from exiting prematurely.

    // Verify the peer received what was expected.
    val synStream1 = peer.takeFrame()
    assertThat(synStream1.type).isEqualTo(Http2.TYPE_HEADERS)
    val pingFrame = peer.takeFrame()

import org.lastaflute.web.validation.Required;
import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

/**
 * Form class for editing protected words dictionary entries in the admin interface.
 * This form extends CreateForm to include fields necessary for updating existing protected words entries.
 * Protected words are terms that should not be stemmed or modified during text analysis.
 *
 */

import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

import jakarta.validation.constraints.Size;

/**
 * Form class for editing elevate word configurations in the admin interface.
 * This form extends CreateForm to include fields necessary for updating existing elevate word entries,
 * including tracking information for optimistic locking and audit trails.

import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

import jakarta.validation.constraints.Size;

/**
 * Form class for editing request header configurations in the admin interface.
 * This form extends CreateForm to include fields necessary for updating existing request header entries,
 * including tracking information for optimistic locking and audit trails.

            op.setup(form -> {
                form.initialize();
                form.crudMode = CrudMode.CREATE;
            });
        });
    }

    /**
     * Displays the form for editing an existing related content item.
     *
     * @param form the edit form containing the ID of the item to edit
     * @return HTML response for the edit form
     */
    @Execute
    @Secured({ ROLE })

                form.crudMode = CrudMode.CREATE;
            });
        }).renderWith(data -> {
            registerWebConfigItems(data);
        });
    }

    /**
     * Displays the form for editing an existing request header item.
     *
     * @param form the edit form containing the ID of the item to edit
     * @return HTML response for the edit form
     */
    @Execute
    @Secured({ ROLE })

import org.lastaflute.web.validation.Required;
import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

/**
 * Form class for editing Kuromoji dictionary entries in the admin interface.
 * This form extends CreateForm to include fields necessary for updating existing Kuromoji dictionary entries.
 * Kuromoji is a Japanese morphological analyzer, and this dictionary manages custom tokenization rules.
 */