* `close()`: 🔐 📁.

🌐 👫 👩‍🔬 `async` 👩‍🔬, 👆 💪 "⌛" 👫.

🖼, 🔘 `async` *➡ 🛠️ 🔢* 👆 💪 🤚 🎚 ⏮️:

```Python
contents = await myfile.read()
```

🚥 👆 🔘 😐 `def` *➡ 🛠️ 🔢*, 👆 💪 🔐 `UploadFile.file` 🔗, 🖼:

```Python
contents = myfile.file.read()
```

!!! note "`async` 📡 ℹ"
    🕐❔ 👆 ⚙️ `async` 👩‍🔬, **FastAPI** 🏃 📁 👩‍🔬 🧵 & ⌛ 👫.

!!! note "💃 📡 ℹ"

🤚 💲 🙆 🔘 🔑 (✅ 🙆 🍕 🚚 ⏮️ 📨) ⚙️:

```Python
some_var.get()
```

### ⚒ 🔑 🔢 `async` 🔗 `reset_db_state()`

🚥 🍕 🔁 📟 ⚒ 💲 ⏮️ `some_var.set("updated in function")` (✅ 💖 `async` 🔗), 🎂 📟 ⚫️ & 📟 👈 🚶 ⏮️ (✅ 📟 🔘 `async` 🔢 🤙 ⏮️ `await`) 🔜 👀 👈 🆕 💲.

, 👆 💼, 🚥 👥 ⚒ 🏒 🇵🇸 🔢 (⏮️ 🔢 `dict`) `async` 🔗, 🌐 🎂 🔗 📟 👆 📱 🔜 👀 👉 💲 & 🔜 💪 ♻ ⚫️ 🎂 📨.

& 🔑 🔢 🔜 ⚒ 🔄 ⏭ 📨, 🚥 👫 🛠️.

        def workerLeaseService = this.workerLeaseService(maxWorkers)
        def processor = createProcessor(workerLeaseService, maxWorkers)
        def processorWorker = new SimpleWorker()

        when:
        async {
            start {
                def cl = workerLeaseService.startWorker()
                instant.worker1
                thread.blockUntil.worker2Ready
                thread.block()

8. Notice that this *path operation function* uses regular `def` instead of `async def`.

    As always, in FastAPI you can combine `def` and `async def` as needed.

    If you need a refresher about when to use which, check out the section _"In a hurry?"_ in the docs about [`async` and `await`](../async.md#in-a-hurry){.internal-link target=_blank}.

8. Beachten Sie, dass diese *Pfadoperation-Funktion* reguläres `def` anstelle von `async def` verwendet.

    Wie immer können Sie in FastAPI `def` und `async def` beliebig kombinieren.

    Wenn Sie eine Auffrischung darüber benötigen, wann welche Anwendung sinnvoll ist, lesen Sie den Abschnitt „In Eile?“ in der Dokumentation zu [`async` und `await`](../async.md#in-eile){.internal-link target=_blank}.

from fastapi.testclient import TestClient

app = FastAPI()


@app.get("/hidden_cookie")
async def hidden_cookie(
    hidden_cookie: Optional[str] = Cookie(default=None, include_in_schema=False),
):
    return {"hidden_cookie": hidden_cookie}


@app.get("/hidden_header")
async def hidden_header(
    hidden_header: Optional[str] = Header(default=None, include_in_schema=False),
):

        defaultProfiler,
        display = ParameterDisplay.PROMPT,
        allowEmpty = false,
        description = "Command line option for the performance test task to enable profiling. For example `async-profiler`, `async-profiler-heap`, `async-profiler-all` or `jfr`. Use `none` for benchmarking only."
    )
}

object AdHocPerformanceScenarioLinux : AdHocPerformanceScenario(Os.LINUX)

//sys	Fchmod(fd int, mode uint32) (err error)
//sys	Fchown(fd int, uid int, gid int) (err error)
//sys	Flock(fd int, how int) (err error)
//sys	Fpathconf(fd int, name int) (val int, err error)
//sys	Fsync(fd int) (err error)
//  Fsync is not called for os.File.Sync(). Please see internal/poll/fd_fsync_darwin.go
//sys	Ftruncate(fd int, length int64) (err error)
//sys	Getdtablesize() (size int)
//sysnb	Getegid() (egid int)
//sysnb	Geteuid() (uid int)

        def project = project("p1")

        createRootProject()
        def state = registry.stateFor(projectId("p1"))
        createProject(state, project)

        when:
        async {
            workerThread {
                assert !state.hasMutableState()
                state.applyToMutableState {
                    assert state.hasMutableState()
                    instant.start

app = FastAPI()

T = TypeVar("T")

Dep = Annotated[T, Depends()]


class A:
    pass


class B:
    pass


@app.get("/a")
async def a(dep: Dep[A]):
    return {"cls": dep.__class__.__name__}


@app.get("/b")
async def b(dep: Dep[B]):
    return {"cls": dep.__class__.__name__}


client = TestClient(app)


def test_generic_parameterless_depends():