В настоящее время он не очень популярен и не используется.

OAuth2 не указывает, как шифровать сообщение, он ожидает, что ваше приложение будет обслуживаться по протоколу HTTPS.

/// tip | "Подсказка"

В разделе **Развертывание** вы увидите [как настроить протокол HTTPS бесплатно, используя Traefik и Let's Encrypt.](https://fastapi.tiangolo.com/ru/deployment/https/)

///

## OpenID Connect

    }
}
```

/// tip

Notice the auto-generated server with a `url` value of `/api/v1`, taken from the `root_path`.

///

In the docs UI at <a href="http://127.0.0.1:9999/api/v1/docs" class="external-link" target="_blank">http://127.0.0.1:9999/api/v1/docs</a> it would look like:

<img src="/img/tutorial/behind-a-proxy/image03.png">

/// tip

{!../../docs_src/custom_response/tutorial001b.py!}
```

/// info

🔢 `response_class` 🔜 ⚙️ 🔬 "📻 🆎" 📨.

👉 💼, 🇺🇸🔍 🎚 `Content-Type` 🔜 ⚒ `application/json`.

 & ⚫️ 🔜 📄 ✅ 🗄.

///

/// tip

`ORJSONResponse` ⏳ 🕴 💪 FastAPI, 🚫 💃.

///

## 🕸 📨

📨 📨 ⏮️ 🕸 🔗 ⚪️➡️ **FastAPI**, ⚙️ `HTMLResponse`.

* 🗄 `HTMLResponse`.
* 🚶‍♀️ `HTMLResponse` 🔢 `response_class` 👆 *➡ 🛠️ 👨‍🎨*.

It is not very popular or used nowadays.

OAuth2 doesn't specify how to encrypt the communication, it expects you to have your application served with HTTPS.

/// tip

In the section about **deployment** you will see how to set up HTTPS for free, using Traefik and Let's Encrypt.

///

## OpenID Connect

OpenID Connect is another specification, based on **OAuth2**.

* You can then further modify the `response` before returning it.

```Python hl_lines="8-9  11  14"
{!../../docs_src/middleware/tutorial001.py!}
```

/// tip

Keep in mind that custom proprietary headers can be added <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers" class="external-link" target="_blank">using the 'X-' prefix</a>.

```

/// info

<a href="https://docs.python.org/3/library/enum.html" class="external-link" target="_blank">Enumerations (or enums) are available in Python</a> since version 3.4.

///

/// tip

If you are wondering, "AlexNet", "ResNet", and "LeNet" are just names of Machine Learning <abbr title="Technically, Deep Learning model architectures">models</abbr>.

///

### Declare a *path parameter*

```

////

//// tab | Python 3.8+

```Python hl_lines="16"
{!> ../../docs_src/dependencies/tutorial012_an.py!}
```

////

//// tab | Python 3.8 non-Annotated

/// tip

Prefer to use the `Annotated` version if possible.

///

```Python hl_lines="15"
{!> ../../docs_src/dependencies/tutorial012.py!}
```

////

	"syscall"
	"time"
)

// CheckPortAvailability - check if given host and port is already in use.
// Note: The check method tries to listen on given port and closes it.
// It is possible to have a disconnected client in this tiny window of time.
func CheckPortAvailability(host, port string, opts TCPOptions) (err error) {
	lc := &net.ListenConfig{
		Control: func(network, address string, c syscall.RawConn) error {
			c.Control(func(fdPtr uintptr) {

In this case, the HTTP header `Content-Type` will be set to `application/json`.

And it will be documented as such in OpenAPI.

///

/// tip

The `ORJSONResponse` is only available in FastAPI, not in Starlette.

///

## HTML Response

To return a response with HTML directly from **FastAPI**, use `HTMLResponse`.

* Import `HTMLResponse`.

```

////

//// tab | Python 3.8+

```Python hl_lines="16"
{!> ../../docs_src/dependencies/tutorial012_an.py!}
```

////

//// tab | Python 3.8 non-Annotated

/// tip | "Подсказка"

Рекомендуется использовать 'Annotated' версию, если это возможно.

///

```Python hl_lines="15"
{!> ../../docs_src/dependencies/tutorial012.py!}
```

////