* endpoint) or <i>closed</i> (includes the endpoint) on that side. With three possibilities on each
 * side, this yields nine basic types of ranges, enumerated below. (Notation: a square bracket
 * ({@code [ ]}) indicates that the range is closed on that side; a parenthesis ({@code ( )}) means
 * it is either open or unbounded. The construct {@code {x | statement}} is read "the set of all

		if err != nil {
			err = errObjectTampered // assign correct error type
		}
		return int64(size), err
	}

	var size int64
	for _, part := range o.Parts {
		partSize, err := sio.DecryptedSize(uint64(part.Size))
		if err != nil {
			return -1, errObjectTampered
		}
		size += int64(partSize)
	}
	return size, nil
}

mouth and yawned once or twice, and shook itself.  Then it got
down off the mushroom, and crawled away in the grass, merely
remarking as it went, `One side will make you grow taller, and
the other side will make you grow shorter.'

  `One side of WHAT?  The other side of WHAT?' thought Alice to
herself.

  `Of the mushroom,' said the Caterpillar, just as if she had
asked it aloud; and in another moment it was out of sight.

///

### Nicht-async *Pfadoperation-Funktionen* { #non-async-path-operation-functions }

Sie können auch normale `def`-Funktionen (ohne `async`) verwenden und `yield` auf die gleiche Weise einsetzen.

FastAPI stellt sicher, dass sie korrekt ausgeführt werden, sodass der Event Loop nicht blockiert wird.

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

Öffnen Sie Ihren Browser unter [http://127.0.0.1:8000](http://127.0.0.1:8000).

Sie sehen eine einfache Seite wie:

<img src="/img/tutorial/websockets/image01.png">

Sie können Nachrichten in das Eingabefeld tippen und absenden:

<img src="/img/tutorial/websockets/image02.png">

	signedHeaders = append(signedHeaders, "x-amz-server-side-encryption")
	// expect to fail with `ErrUnsignedHeaders` because couldn't find some header
	_, errCode = extractSignedHeaders(signedHeaders, r)
	if errCode != ErrUnsignedHeaders {
		t.Fatalf("Expected the APIErrorCode to %d, but got %d", ErrUnsignedHeaders, errCode)
	}
	// set headers value through Get parameter
	inputQuery.Add("x-amz-server-side-encryption", xhttp.AmzEncryptionAES)

## Normal **FastAPI** uygulaması { #the-normal-fastapi-app }

Önce callback eklemeden önce normal API uygulamasının nasıl görüneceğine bakalım.

Bir `Invoice` body alacak bir *path operation*'ı ve callback için URL'yi taşıyacak `callback_url` adlı bir query parametresi olacak.

Bu kısım oldukça standart; kodun çoğu muhtemelen size zaten tanıdık gelecektir:

This, of course, is not optimal and you wouldn't use it for production.

In production you would have one of the options above.

But it's the simplest way to focus on the server-side of WebSockets and have a working example:

{* ../../docs_src/websockets_/tutorial001_py310.py hl[2,6:38,41:43] *}

## Create a `websocket` { #create-a-websocket }

In your **FastAPI** application, create a `websocket`:

 * endpoint) or <i>closed</i> (includes the endpoint) on that side. With three possibilities on each
 * side, this yields nine basic types of ranges, enumerated below. (Notation: a square bracket
 * ({@code [ ]}) indicates that the range is closed on that side; a parenthesis ({@code ( )}) means
 * it is either open or unbounded. The construct {@code {x | statement}} is read "the set of all

## Parametreleri İhtiyacınıza Göre Sıralayın: Küçük Hileler { #order-the-parameters-as-you-need-tricks }

/// tip | İpucu

`Annotated` kullanıyorsanız, bu muhtemelen o kadar önemli ya da gerekli değildir.

///

İşte bazen işe yarayan **küçük bir hile**; ama çok sık ihtiyacınız olmayacak.

Şunları yapmak istiyorsanız:

* `q` query parametresini `Query` kullanmadan ve herhangi bir default değer vermeden tanımlamak