Eğer tarayıcınızda şu bağlantıyı:

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

...`needy` parametresini eklemeden açarsanız şuna benzer bir hata ile karşılaşırsınız:

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

Yani bu veri tipi tanımlarını tekrar kullanmak pek de kolay değil.

Biraz daha detaylı ayarlamalara gerek duyuyor. Ayrıca <abbr title="ASGI (Asynchronous Server Gateway Interface): Asenkron Sunucu Ağ Geçidi Arabirimi, asenkron Python web uygulamaları geliştirmek için yeni standart.">ASGI</abbr> yerine <abbr title="WSGI (Web Server Gateway Interface): Web Sunucusu Ağ Geçidi Arabirimi, Pythonda senkron web uygulamaları geliştirmek için eski standart.">WSGI</abbr>'a dayanıyor. Yani Uvicorn, Starlette...

➡️ 💬 👆 💚 ⚫️ 📨 🔂 & 📁 🎻, 👆 💚 ⚙️ Orjson 🎛 `orjson.OPT_INDENT_2`.

👆 💪 ✍ `CustomORJSONResponse`. 👑 👜 👆 ✔️ ✍ `Response.render(content)` 👩‍🔬 👈 📨 🎚 `bytes`:

{* ../../docs_src/custom_response/tutorial009c.py hl[9:14,17] *}

🔜 ↩️ 🛬:

```json
{"message": "Hello World"}
```

...👉 📨 🔜 📨:

```json
{

<style>
.md-content .md-typeset h1 { display: none; }
</style>

<p align="center">
  <a href="https://fastapi.tiangolo.com"><img src="https://fastapi.tiangolo.com/img/logo-margin/logo-teal.png" alt="FastAPI"></a>
</p>
<p align="center">
    FastAPI framework, alto rendimiento, fácil de aprender, rápido de programar, listo para producción
</p>
<p align="center">

<style>
.md-content .md-typeset h1 { display: none; }
</style>

<p align="center">
  <a href="https://fastapi.tiangolo.com"><img src="https://fastapi.tiangolo.com/img/logo-margin/logo-teal.png" alt="FastAPI"></a>
</p>
<p align="center">
    FastAPI framework, zeer goede prestaties, eenvoudig te leren, snel te programmeren, klaar voor productie
</p>
<p align="center">

<style>
.md-content .md-typeset h1 { display: none; }
</style>

<p align="center">
  <a href="https://fastapi.tiangolo.com"><img src="https://fastapi.tiangolo.com/img/logo-margin/logo-teal.png" alt="FastAPI"></a>
</p>
<p align="center">
    Framework FastAPI, alta performance, fácil de aprender, fácil de codar, pronto para produção
</p>
<p align="center">

<p align="center">
  <a href="https://fastapi.tiangolo.com"><img src="https://fastapi.tiangolo.com/img/logo-margin/logo-teal.png" alt="FastAPI"></a>
</p>
<p align="center">
    FastAPI 框架，高效能，易於學習，快速開發，適用於生產環境
</p>
<p align="center">
<a href="https://github.com/fastapi/fastapi/actions?query=workflow%3ATest+event%3Apush+branch%3Amaster" target="_blank">

<style>
.md-content .md-typeset h1 { display: none; }
</style>

<p align="center">
  <a href="https://fastapi.tiangolo.com"><img src="https://fastapi.tiangolo.com/img/logo-margin/logo-teal.png" alt="FastAPI"></a>
</p>
<p align="center">
    Framework FastAPI, haute performance, facile à apprendre, rapide à coder, prêt pour la production
</p>
<p align="center">

					</la:link>
				</div>
			</c:if>
		</c:if>
	</aside>
</div>
<div class="row">
	<nav id="subfooter" class="mx-auto">
		<ul class="pagination justify-content-center">
			<c:if test="${existPrevPage}">
				<li class="page-item"><la:link styleClass="page-link" aria-label="Previous"

* `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.py hl[1,18] *}

### `HTMLResponse` { #htmlresponse }