///

## Den Defaultwert ändern { #changing-the-default }

# Response – Statuscode ändern { #response-change-status-code }

Sie haben wahrscheinlich schon vorher gelesen, dass Sie einen Default-[Response-Statuscode](../tutorial/response-status-code.md) festlegen können.

In manchen Fällen müssen Sie jedoch einen anderen als den Default-Statuscode zurückgeben.

## Anwendungsfall { #use-case }

Stellen Sie sich zum Beispiel vor, Sie möchten standardmäßig den HTTP-Statuscode „OK“ `200` zurückgeben.

          requireNonNull(left);
          if (left.balanceFactor() < 0) {
            left = left.rotateLeft();
          }
          return rotateRight();
        default:
          recomputeHeight();
          return this;
      }
    }

    private int balanceFactor() {
      return height(left) - height(right);
    }

    private AvlNode<E> rotateLeft() {

## `Header` Parametrelerini Tanımlayın { #declare-header-parameters }

Ardından header parametrelerini, `Path`, `Query` ve `Cookie` ile kullandığınız yapının aynısıyla tanımlayın.

Default değeri ve ek validation ya da annotation parametrelerinin tamamını belirleyebilirsiniz:

{* ../../docs_src/header_params/tutorial001_an_py310.py hl[9] *}

/// note | Teknik Detaylar

                                           TF_Operation* op);

// Call some TF_SetAttr*() function for every attr that is not
// inferred from an input and doesn't have a default value you wish to
// keep.

// `value` must point to a string of length `length` bytes.
TF_CAPI_EXPORT extern void TF_SetAttrString(TF_OperationDescription* desc,

Entonces:

```Python
q: str | None = Query(default=None)
```

...hace que el parámetro sea opcional, con un valor por defecto de `None`, lo mismo que:


```Python

{{- $statements_length := sub $statements_length 1 -}}
{
  "Version": "2012-10-17",
  "Statement": [
{{- range $i, $statement := .statements }}
    {
      "Effect": "{{ $statement.effect | default "Allow" }}",
      "Action": [
"{{ $statement.actions | join "\",\n\"" }}"
      ]{{ if $statement.resources }},
      "Resource": [
"{{ $statement.resources | join "\",\n\"" }}"
      ]{{ end }}

Donc :

```Python
q: str | None = Query(default=None)
```

... rend le paramètre optionnel, avec une valeur par défaut de `None`, comme :

```Python
q: str | None = None
```

        // requireNonNull is safe because the first `size` elements have been filled in.
        Entry<K, V> onlyEntry = requireNonNull(entryArray[0]);
        return of(comparator, onlyEntry.getKey(), onlyEntry.getValue());
      default:
        Object[] keys = new Object[size];
        Object[] values = new Object[size];
        if (sameComparator) {
          // Need to check for nulls, but don't need to sort or validate.

                    Arguments.of(true, "4.0.0", true, "Should be applicable when --all is specified (overrides model)"),
                    Arguments.of(null, null, false, "Should not be applicable by default"),
                    Arguments.of(false, null, false, "Should not be applicable when --all=false"),
                    Arguments.of(null, "4.0.0", false, "Should not be applicable for same version (4.0.0)"),