Then open 10 tabs at <a href="http://127.0.0.1:8000/docs#/default/read_slow_users_slowusers__get" class="external-link" target="_blank">http://127.0.0.1:8000/docs#/default/read_slow_users_slowusers__get</a> at the same time.

Go to the *path operation* "Get `/slowusers/`" in all of the tabs. Use the "Try it out" button and execute the request in each tab, one right after the other.

=== "Python 3.8+"

    ```Python hl_lines="81-83"
    {!> ../../../docs_src/websockets/tutorial003.py!}
    ```

To try it out:

* Open the app with several browser tabs.
* Write messages from them.
* Then close one of the tabs.

That will raise the `WebSocketDisconnect` exception, and all the other clients will receive a message like:

```
Client #1596980209979 left the chat
```

!!! tip

      name: Switch to light mode
  features:
  - search.suggest
  - search.highlight
  - content.tabs.link
  - navigation.indexes
  - content.tooltips
  - navigation.path
  - content.code.annotate
  - content.code.copy
  - content.code.select
  - navigation.tabs
  icon:
    repo: fontawesome/brands/github-alt
  logo: img/icon-white.svg
  favicon: img/favicon.png
  language: en

    ```Python hl_lines="81-83"
    {!> ../../../docs_src/websockets/tutorial003.py!}
    ```

Zum Ausprobieren:

* Öffnen Sie die Anwendung mit mehreren Browser-Tabs.
* Schreiben Sie Nachrichten in den Tabs.
* Schließen Sie dann einen der Tabs.

Das wird die Ausnahme `WebSocketDisconnect` auslösen und alle anderen Clients erhalten eine Nachricht wie:

```
Client #1596980209979 left the chat
```

    - media: "(prefers-color-scheme: dark)"
      scheme: slate
      primary: teal
      accent: blue
      toggle:
        icon: octicons/moon-24
        name: "Switch to Light Mode"
  features:
  - navigation.tabs

extra_css:
  - 'assets/css/app.css'

markdown_extensions:
  - smarty
  - footnotes
  - meta
  - toc:
      permalink: true
  - attr_list
  - pymdownx.betterem:
      smart_enable: all

	table.SetCenterSeparator("")
	table.SetColumnSeparator("")
	table.SetRowSeparator("")
	table.SetHeaderLine(false)
	// table.EnableBorder(false)
	table.SetTablePadding("\t") // pad with tabs
	table.SetNoWhiteSpace(true)

	if set {
		if err := setxattr(path, name, value); err != nil {
			log.Fatalln(fmt.Errorf("setting attribute %s failed with: %v", name, err))
		}
	} else {
		if name == "" {

      writeUtf8CodePoint(codePoint)
    }
    i += Character.charCount(codePoint)
  }
}

/**
 * Returns a substring of `input` on the range `[pos..limit)` with the following
 * transformations:
 *
 *  * Tabs, newlines, form feeds and carriage returns are skipped.
 *
 *  * In queries, ' ' is encoded to '+' and '+' is encoded to "%2B".
 *
 *  * Characters in `encodeSet` are percent-encoded.
 *

    "UP",  # pyupgrade
]
ignore = [
    "E501",  # line too long, handled by black
    "B008",  # do not perform function calls in argument defaults
    "C901",  # too complex
    "W191",  # indentation contains tabs
]

[tool.ruff.lint.per-file-ignores]
"__init__.py" = ["F401"]
"docs_src/dependencies/tutorial007.py" = ["F821"]
"docs_src/dependencies/tutorial008.py" = ["F821"]
"docs_src/dependencies/tutorial009.py" = ["F821"]

        ] = "/openapi.json",
        openapi_tags: Annotated[
            Optional[List[Dict[str, Any]]],
            Doc(
                """
                A list of tags used by OpenAPI, these are the same `tags` you can set
                in the *path operations*, like:

                * `@app.get("/users/", tags=["users"])`
                * `@app.get("/items/", tags=["items"])`

	<li>
	<code>x</code> is <a href="#Assignability">assignable</a>
	to <code>T</code>.
	</li>
	<li>
	ignoring struct tags (see below),
	<code>x</code>'s type and <code>T</code> have <a href="#Type_identity">identical</a>
	<a href="#Types">underlying types</a>.
	</li>
	<li>
	ignoring struct tags (see below),
	<code>x</code>'s type and <code>T</code> are pointer types