{* ../../docs_src/websockets/tutorial001.py hl[48:52] *}

您可以接收和发送二进制、文本和 JSON 数据。

## 尝试一下

如果您的文件名为 `main.py`，请使用以下命令运行应用程序：

```console
$ uvicorn main:app --reload

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

在浏览器中打开 <a href="http://127.0.0.1:8000" class="external-link" target="_blank">http://127.0.0.1:8000</a>。

您将看到一个简单的页面，如下所示：

5,255,255,.8)}.bg-gradient-green>.card-header .btn-tool:hover,.bg-green>.card-header .btn-tool:hover,.card-green:not(.card-outline)>.card-header .btn-tool:hover{color:#fff}.card.bg-gradient-green .bootstrap-datetimepicker-widget .table td,.card.bg-gradient-green .bootstrap-datetimepicker-widget .table th,.card.bg-green .bootstrap-datetimepicker-widget .table td,.card.bg-green .bootstrap-datetimepicker-widget .table th{border:none}.card.bg-gradient-green .bootstrap-datetimepicker-widget table td....

		if IsTerminal() {
			return color.New(color.FgYellow).SprintfFunc()
		}
		return fmt.Sprintf
	}()

	Green = func() func(a ...any) string {
		if IsTerminal() {
			return color.New(color.FgGreen).SprintFunc()
		}
		return fmt.Sprint
	}()

	Greenf = func() func(format string, a ...any) string {
		if IsTerminal() {
			return color.New(color.FgGreen).SprintfFunc()
		}
		return fmt.Sprintf

## Es ausprobieren { #try-it }

Wenn Ihre Datei `main.py` heißt, führen Sie Ihre Anwendung so aus:

<div class="termy">

```console
$ fastapi dev main.py

<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 <a href="http://127.0.0.1:8000" class="external-link" target="_blank">http://127.0.0.1:8000</a>.

rootdir: /home/user/code/superawesome-cli/app
plugins: forked-1.1.3, xdist-1.31.0, cov-2.8.1
collected 6 items

---> 100%

test_main.py <span style="color: green; white-space: pre;">......                            [100%]</span>

<span style="color: green;">================= 1 passed in 0.03s =================</span>
```

none;\n}\n\n.card.bg-green .bootstrap-datetimepicker-widget table thead tr:first-child th:hover,\n.card.bg-green .bootstrap-datetimepicker-widget table td.day:hover,\n.card.bg-green .bootstrap-datetimepicker-widget table td.hour:hover,\n.card.bg-green .bootstrap-datetimepicker-widget table td.minute:hover,\n.card.bg-green .bootstrap-datetimepicker-widget table td.second:hover,\n.card.bg-gradient-green .bootstrap-datetimepicker-widget table thead tr:first-child th:hover,\n.card.bg-gradient-green .bootstrap...

import java.io.Closeable;
import java.io.Flushable;
import java.io.IOException;
import java.io.Writer;
import org.jspecify.annotations.NullUnmarked;

/**
 * Unit test for {@link AppendableWriter}.
 *
 * @author Alan Green
 */
@NullUnmarked
public class AppendableWriterTest extends IoTestCase {

  /** Helper class for testing behavior with Flushable and Closeable targets. */

Then you could disable OpenAPI (including the UI docs) by setting the environment variable `OPENAPI_URL` to the empty string, like:

<div class="termy">

```console
$ OPENAPI_URL= uvicorn main:app

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

</div>

Then if you go to the URLs at `/openapi.json`, `/docs`, or `/redoc` you will just get a `404 Not Found` error like:

        return style("." + Constants.MAVEN_STYLE_ERROR_NAME + ":-" + Constants.MAVEN_STYLE_ERROR_DEFAULT, message);
    }

    /**
     * Append message content in success style.
     * By default, bold green
     *
     * @param message the message to append
     * @return the current builder
     */
    @Nonnull
    default MessageBuilder success(Object message) {

<div class="termy">

```console
$ OPENAPI_URL= uvicorn main:app

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

</div>

После этого, если перейти по адресам `/openapi.json`, `/docs` или `/redoc`, вы получите ошибку `404 Not Found`, например: