_ = syscall.SetsockoptInt(fd, syscall.SOL_TCP, unix.TCP_CORK, 0)
			}

			// Enable TCP open
			// https://lwn.net/Articles/508865/ - 32k queue size.
			_ = syscall.SetsockoptInt(fd, syscall.SOL_TCP, unix.TCP_FASTOPEN, 32*1024)

			// Enable TCP fast connect
			// TCPFastOpenConnect sets the underlying socket to use
			// the TCP fast open connect. This feature is supported
			// since Linux 4.11.

from typing import Annotated, Union

from fastapi import BackgroundTasks, Depends, FastAPI

app = FastAPI()


def write_log(message: str):
    with open("log.txt", mode="a") as log:
        log.write(message)


def get_query(background_tasks: BackgroundTasks, q: Union[str, None] = None):
    if q:
        message = f"found query: {q}\n"
        background_tasks.add_task(write_log, message)
    return q

/**
 * Repository providing access to class bytes by Kotlin source names.
 *
 * Follows the one directory per package name segment convention.
 * Keeps JAR files open for fast lookup, must be closed.
 *
 * Always include the current JVM platform loader for which no JAR file can be held open.
 */
class ClassBytesRepository(
    platformClassLoader: ClassLoader,
    classPathFiles: List<File>,
    classPathDependencies: List<File> = emptyList(),

여기서, `shutdown` 이벤트 핸들러 함수는 `"Application shutdown"`이라는 텍스트를 `log.txt` 파일에 기록합니다.

/// info | 정보

`open()` 함수에서 `mode="a"`는 "추가"를 의미하므로, 파일에 있는 기존 내용은 덮어쓰지 않고 새로운 줄이 추가됩니다.

///

/// tip | 팁

이 경우, 우리는 표준 파이썬 `open()` 함수를 사용하여 파일과 상호작용하고 있습니다.

따라서 I/O(입출력) 작업이 포함되어 있어 디스크에 기록되는 것을 "기다리는" 과정이 필요합니다.

하지만 `open()`은 `async`와 `await`를 사용하지 않습니다.

그래서 우리는 이벤트 핸들러 함수를 `async def` 대신 일반 `def`로 선언합니다.

///

# Configure a UI do Swagger { #configure-swagger-ui }

Você pode configurar alguns <a href="https://swagger.io/docs/open-source-tools/swagger-ui/usage/configuration/" class="external-link" target="_blank">parâmetros extras da UI do Swagger</a>.

Para configurá-los, passe o argumento `swagger_ui_parameters` ao criar o objeto da aplicação `FastAPI()` ou para a função `get_swagger_ui_html()`.

from fastapi import FastAPI

app = FastAPI()


@app.on_event("shutdown")
def shutdown_event():
    with open("log.txt", mode="a") as log:
        log.write("Application shutdown")


@app.get("/items/")
async def read_items():

// the directory itself, if the dirPath doesn't exist this function doesn't return
// an error.
func readDirFn(dirPath string, filter func(name string, typ os.FileMode) error) error {
	d, err := Open(dirPath)
	if err != nil {
		if osErrToFileErr(err) == errFileNotFound {
			return nil
		}
		return osErrToFileErr(err)
	}
	defer d.Close()

	maxEntries := 1000
	for {

```

</div>

And open the docs at <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.

You will see the automatic API docs for the main app, including only its own _path operations_:

<img src="/img/tutorial/sub-applications/image01.png">

   * the source will contain the concatenated data from the streams of the underlying sources.
   *
   * <p>Only one underlying stream will be open at a time. Closing the concatenated stream will
   * close the open underlying stream.
   *
   * @param sources the sources to concatenate
   * @return a {@code ByteSource} containing the concatenated data
   * @since 15.0
   */

 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

/**
 * Utilities for reflection. This package is a part of the open-source <a
 * href="https://github.com/google/guava">Guava</a> library.
 */
@CheckReturnValue
@NullMarked
package com.google.common.reflect;

import com.google.errorprone.annotations.CheckReturnValue;