},
                "x-aperture-labs-portal": "blue"
            }
        }
    }
}
```

### Custom OpenAPI *path operation* schema { #custom-openapi-path-operation-schema }

The dictionary in `openapi_extra` will be deeply merged with the automatically generated OpenAPI schema for the *path operation*.

So, you could add additional data to the automatically generated schema.

@GwtCompatible
public final class Comparators {
  private Comparators() {}

  /**
   * Returns a new comparator which sorts iterables by comparing corresponding elements pairwise
   * until a nonzero result is found; imposes "dictionary order." If the end of one iterable is
   * reached, but not the other, the shorter iterable is considered to be less than the longer one.

{* ../../docs_src/events/tutorial003.py hl[16,19] *}

Hier simulieren wir das langsame *Hochfahren*, das Laden des Modells, indem wir die (Fake-)Modellfunktion vor dem `yield` in das Dictionary mit Modellen für maschinelles Lernen einfügen. Dieser Code wird ausgeführt, **bevor** die Anwendung **beginnt, Requests entgegenzunehmen**, während des *Hochfahrens*.

    "joined": "2018-11-30",
}

my_second_user: User = User(**second_user_data)
```

/// info

`**second_user_data` bedeutet:

Nimm die Schlüssel-Wert-Paare des `second_user_data` <abbr title="Dictionary – Wörterbuch: In anderen Programmiersprachen auch Hash, Map, Objekt, Assoziatives Array genannt">Dicts</abbr> und übergib sie direkt als Schlüsselwort-Argumente. Äquivalent zu: `User(id=4, name="Mary", joined="2018-11-30")`.

///

#### A Random Item { #a-random-item }

With `data.items()` we get an <abbr title="Something we can iterate on with a for loop, like a list, set, etc.">iterable object</abbr> with tuples containing the key and value for each dictionary item.

We convert this iterable object into a proper `list` with `list(data.items())`.

    /**
     * Get the value for the key 'index.dictionary.prefix'. <br>
     * The value is, e.g.  <br>
     * comment: Prefix for dictionary index names.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getIndexDictionaryPrefix();

    /**
     * Get the value for the key 'index.dictionary.prefix' as {@link Integer}. <br>

        if (StringUtil.isNotBlank(fessConfig.getIndexDictionaryPrefix())) {
            String dictionaryPath = System.getProperty("fess.dictionary.path", StringUtil.EMPTY);
            if (StringUtil.isBlank(dictionaryPath)) {
                System.setProperty("fess.dictionary.path", fessConfig.getIndexDictionaryPrefix() + "/");
            } else {
                if (!dictionaryPath.endsWith("/")) {

    /** The key of the message: Dictionary List */
    public static final String LABELS_dict_configuration = "{labels.dict_configuration}";

    /** The key of the message: Dictionary List */
    public static final String LABELS_dict_list_title = "{labels.dict_list_title}";

    /** The key of the message: Dictionary */

///

### Checking the current `root_path` { #checking-the-current-root-path }

You can get the current `root_path` used by your application for each request, it is part of the `scope` dictionary (that's part of the ASGI spec).

Here we are including it in the message just for demonstration purposes.

{* ../../docs_src/behind_a_proxy/tutorial001.py hl[8] *}

Then, if you start Uvicorn with:

///

### Überprüfen des aktuellen `root_path`

Sie können den aktuellen `root_path` abrufen, der von Ihrer Anwendung für jede Anfrage verwendet wird. Er ist Teil des `scope`-Dictionarys (das ist Teil der ASGI-Spezifikation).

Hier fügen wir ihn, nur zu Demonstrationszwecken, in die Nachricht ein.

{* ../../docs_src/behind_a_proxy/tutorial001.py hl[8] *}

Wenn Sie Uvicorn dann starten mit: