*  * If `server_max_window_bits` is less than 15, OkHttp will waste memory on an oversized buffer.
 *
 * See [RFC 7692, 7.1][rfc_7692] for details on negotiation process.
 *
 * [rfc_7692]: https://tools.ietf.org/html/rfc7692#section-7.1
 */
@IgnoreJRERequirement // As of AGP 3.4.1, D8 desugars API 24 hashCode methods.
data class WebSocketExtensions(

/// info

As this is a WebSocket it doesn't really make sense to raise an `HTTPException`, instead we raise a `WebSocketException`.

You can use a closing code from the [valid codes defined in the specification](https://tools.ietf.org/html/rfc6455#section-7.4.1).

///

### Try the WebSockets with dependencies { #try-the-websockets-with-dependencies }

Run your application:

<div class="termy">

```console

/// info | Примечание

В веб-сокете вызывать `HTTPException` не имеет смысла. Вместо этого нужно использовать `WebSocketException`.

Вы можете использовать код закрытия из [допустимых кодов, определённых в спецификации](https://tools.ietf.org/html/rfc6455#section-7.4.1).

///

### Веб-сокеты с зависимостями: проверка в действии { #try-the-websockets-with-dependencies }

Запустите приложение:

<div class="termy">

```console

其中一個相當萬用的選擇是 [OpenAPI Generator](https://openapi-generator.tech/)，它支援**多種程式語言**，並能從你的 OpenAPI 規格產生 SDK。

針對 **TypeScript 用戶端**，[Hey API](https://heyapi.dev/) 是專門打造的解決方案，為 TypeScript 生態系提供最佳化的體驗。

你可以在 [OpenAPI.Tools](https://openapi.tools/#sdk) 找到更多 SDK 產生器。

/// tip

FastAPI 會自動產生 **OpenAPI 3.1** 規格，因此你使用的任何工具都必須支援這個版本。

///

## 來自 FastAPI 贊助商的 SDK 產生器 { #sdk-generators-from-fastapi-sponsors }

## Decoding Metadata

Metadata is stored in `xl.meta` files for erasure coded objects. Each disk in the set containing the object has this file. The file format is a binary format and therefore requires tools to view values.

### Installing xl-meta

To install, [Go](https://golang.org/dl/) must be installed. Once installed, execute this to install the binary:

```bash

 * variables. An {@code AtomicDouble} is used in applications such as atomic accumulation, and
 * cannot be used as a replacement for a {@link Double}. However, this class does extend {@code
 * Number} to allow uniform access by tools and utilities that deal with numerically-based classes.
 *
 * <p><a id="bitEquals"></a>This class compares primitive {@code double} values in methods such as

As FastAPI will not try to convert the data to JSON with Pydantic or serialize it in any way, in this case, the type annotation is only for your editor and tools to use, it won't be used by FastAPI.

{* ../../docs_src/stream_data/tutorial001_py310.py ln[32:35] hl[33] *}

```console
$ fastapi dev main.py
```

Aber Sie müssten sich merken, bei jedem Aufruf des `fastapi`-Befehls den korrekten Pfad zu übergeben.

Zusätzlich könnten andere Tools sie nicht finden, z. B. die [VS Code Extension](editor-support.md) oder [FastAPI Cloud](https://fastapicloud.com), daher wird empfohlen, den `entrypoint` in `pyproject.toml` zu verwenden.

## `fastapi dev` { #fastapi-dev }

```console
$ fastapi dev main.py
```

But you would have to remember to pass the correct path every time you call the `fastapi` command.

Additionally, other tools might not be able to find it, for example the [VS Code Extension](editor-support.md) or [FastAPI Cloud](https://fastapicloud.com), so it is recommended to use the `entrypoint` in `pyproject.toml`.

## `fastapi dev` { #fastapi-dev }

### Pydantic v1 parameters { #pydantic-v1-parameters }

If you need to use some of the FastAPI-specific tools for parameters like `Body`, `Query`, `Form`, etc. with Pydantic v1 models, you can import them from `fastapi.temp_pydantic_v1_params` while you finish the migration to Pydantic v2: