/// note | Technical Details

An `async` task can only be cancelled when it reaches an `await`. If there is no `await`, the generator (function with `yield`) can not be cancelled properly and may keep running even after cancellation is requested.

Since this small example does not need any `await` statements, we add an `await anyio.sleep(0)` to give the event loop a chance to handle cancellation.

import anyio
from fastapi import FastAPI
from fastapi.responses import StreamingResponse

app = FastAPI()


async def fake_video_streamer():
    for i in range(10):
        yield b"some fake video bytes"
        await anyio.sleep(0)


@app.get("/")
async def main():

///

## Attendre des messages et envoyer des messages { #await-for-messages-and-send-messages }

Dans votre route WebSocket, vous pouvez `await` des messages et envoyer des messages.

{* ../../docs_src/websockets_/tutorial001_py310.py hl[48:52] *}

Vous pouvez recevoir et envoyer des données binaires, texte et JSON.

        self.context_name = context_name

    async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
        async with AsyncExitStack() as stack:
            scope[self.context_name] = stack

        configHelper.setLoadCallback(() -> {
            latch.countDown();
            return 1;
        });

        configHelper.update();

        assertTrue("Load method should be called within 5 seconds", latch.await(5, TimeUnit.SECONDS));
        assertEquals(1, configHelper.getLoadCallCount());
    }

    @Test
    public void test_update_multipleCallsIncrementLoadCount() throws InterruptedException {

   the issue and determines the impact it has.
2. A member of the security team will respond and either confirm or reject the security report.
   If the report is rejected the response explains why.
3. Code is audited to find any potential similar problems.
4. Fixes are prepared for the latest release.
5. On the date that the fixes are applied a security advisory will be published on <https://blog.min.io>.

                        },
                    }
                }
            },
            "required": True,
        },
    },
)
async def create_item(request: Request):
    raw_body = await request.body()
    data = magic_data_reader(raw_body)

### Файлы и async { #files-and-async }

В большинстве случаев «файлоподобные» объекты по умолчанию не совместимы с async и await.

Например, у них нет `await file.read()` или `async for chunk in file`.

И во многих случаях чтение таких объектов будет блокирующей операцией (которая может заблокировать цикл событий), потому что данные читаются с диска или из сети.

narrow, to be sure; but I THINK I can kick a little!'

  She drew her foot as far down the chimney as she could, and
waited till she heard a little animal (she couldn't guess of what
sort it was) scratching and scrambling about in the chimney close
above her:  then, saying to herself `This is Bill,' she gave one
sharp kick, and waited to see what would happen next.

  The first thing she heard was a general chorus of `There goes

            AtomicInteger completedOps = new AtomicInteger(0);

            for (int t = 0; t < threadCount; t++) {
                executor.submit(() -> {
                    try {
                        startLatch.await(); // All threads start simultaneously
                        for (int i = 0; i < operationsPerThread; i++) {
                            byte[] localData = new byte[128];