Tarayıcınızda şöyle bir URL açarsanız:

```
http://127.0.0.1:8000/items/foo-item
```

...zorunlu `needy` parametresini eklemeden, şuna benzer bir hata görürsünüz:

```JSON
{
  "detail": [
    {
      "type": "missing",
      "loc": [
        "query",
        "needy"
      ],
      "msg": "Field required",
      "input": null

{"name": "Portal Gun", "description": "A portal opening device."}
{"name": "Meeseeks Box", "description": "A box that summons a Meeseeks."}
```

Bir JSON dizisine (Python list eşdeğeri) çok benzer; ancak öğeler `[]` içine alınmak ve araya `,` konmak yerine, her satırda **bir JSON nesnesi** vardır; bunlar yeni satır karakteri ile ayrılır.

/// info | Bilgi

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* `headers` – Ein `dict` von Strings.
* `media_type` – Ein `str`, der den Medientyp angibt. Z. B. `"text/html"`.

FastAPI (eigentlich Starlette) fügt automatisch einen Content-Length-Header ein. Außerdem wird es einen Content-Type-Header einfügen, der auf dem `media_type` basiert, und für Texttypen einen Zeichensatz (charset) anfügen.

{* ../../docs_src/response_directly/tutorial002_py310.py hl[1,18] *}

* `headers` - A `dict` of strings.
* `media_type` - A `str` giving the media type. E.g. `"text/html"`.

FastAPI (actually Starlette) will automatically include a Content-Length header. It will also include a Content-Type header, based on the `media_type` and appending a charset for text types.

{* ../../docs_src/response_directly/tutorial002_py310.py hl[1,18] *}

### `HTMLResponse` { #htmlresponse }

SSE, HTTP üzerinden sunucudan istemciye veri akışı için bir standarttır.

Her olay, aralarında boş satırlar bulunan ve `data`, `event`, `id` ve `retry` gibi "alanlar" içeren küçük bir metin bloğudur.

Şuna benzer:

```
data: {"name": "Portal Gun", "price": 999.99}

data: {"name": "Plumbus", "price": 32.99}

```

Ardından bunu bir attribute’un tipi olarak kullanabiliriz:

{* ../../docs_src/body_nested_models/tutorial004_py310.py hl[18] *}

Bu da **FastAPI**’nin aşağıdakine benzer bir body bekleyeceği anlamına gelir:

```JSON
{
    "name": "Foo",
    "description": "The pretender",
    "price": 42.0,
    "tax": 3.2,
    "tags": ["rock", "metal", "bar"],
    "image": {

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