/**
     * Set the value of level, used in parameter comment. <br>
     * Even if empty string, treated as empty plainly. So "IF pmb != null" is false if empty.
     * @param level The parameter value of level. (NotNull)
     */
    public void setLevel(String level) {
        registerVariable("level", level);
    }

    /**
     * Set the value of hostname, used in parameter comment. <br>

///

### Einen *Pfad-Parameter* deklarieren { #declare-a-path-parameter }

Dann erstellen Sie einen *Pfad-Parameter*, der als Typ die gerade erstellte Enum-Klasse hat (`ModelName`):

{* ../../docs_src/path_params/tutorial005_py310.py hl[16] *}

### Die API-Dokumentation testen { #check-the-docs }

# Header-Parameter { #header-parameters }

Sie können Header-Parameter genauso definieren, wie Sie `Query`-, `Path`- und `Cookie`-Parameter definieren.

## `Header` importieren { #import-header }

Importieren Sie zuerst `Header`:

{* ../../docs_src/header_params/tutorial001_an_py310.py hl[3] *}

## `Header`-Parameter deklarieren { #declare-header-parameters }

   * the dummy value of a constructor or method parameter is unknown.
   */
  @VisibleForTesting
  static final class ParameterNotInstantiableException extends Exception {
    public ParameterNotInstantiableException(Parameter parameter) {
      super(
          "Cannot determine value for parameter "
              + parameter
              + " of "
              + parameter.getDeclaringInvokable());
    }
  }

{* ../../docs_src/using_request_directly/tutorial001_py310.py hl[1,7:8] *}

Al declarar un parámetro de *path operation function* con el tipo siendo `Request`, **FastAPI** sabrá pasar el `Request` en ese parámetro.

/// tip | Consejo

Nota que en este caso, estamos declarando un parámetro de path además del parámetro del request.

Así que, el parámetro de path será extraído, validado, convertido al tipo especificado y anotado con OpenAPI.

    /** The name of the request parameter. */
    private final String name;

    /** The array of values associated with this parameter. */
    private final String[] values;

    /**
     * Constructs a new RequestParameter with the specified name and values.
     *
     * @param name the name of the parameter, must not be null
     * @param values the array of values for this parameter, can be null or empty
     */

This is probably not as important or necessary if you use `Annotated`.

///

Let's say that you want to declare the query parameter `q` as a required `str`.

And you don't need to declare anything else for that parameter, so you don't really need to use `Query`.

But you still need to use `Path` for the `item_id` path parameter. And you don't want to use `Annotated` for some reason.

# Paramètres de cookie { #cookie-parameters }

Vous pouvez définir des paramètres de cookie de la même manière que vous définissez les paramètres `Query` et `Path`.

## Importer `Cookie` { #import-cookie }

Commencez par importer `Cookie` :

{* ../../docs_src/cookie_params/tutorial001_an_py310.py hl[3] *}

## Déclarer des paramètres `Cookie` { #declare-cookie-parameters }

# Response-Cookies { #response-cookies }

## Einen `Response`-Parameter verwenden { #use-a-response-parameter }

Sie können einen Parameter vom Typ `Response` in Ihrer *Pfadoperation-Funktion* deklarieren.

Und dann können Sie Cookies in diesem *vorübergehenden* <abbr title="Response – Antwort: Daten, die der Server zum anfragenden Client zurücksendet">Response</abbr>-Objekt setzen.

{* ../../docs_src/response_cookies/tutorial002_py310.py hl[1, 8:9] *}

                "Method com.example.Source.foo(java.lang.String): Parameter 0 from null accepting to non-null accepting breaking change.",
                "Method com.example.Source.setSomeVar(java.lang.String): Parameter 0 from null accepting to non-null accepting breaking change.",
                "Constructor com.example.Source(java.lang.String): Parameter 0 from null accepting to non-null accepting breaking change."
            )