Why is there a redirect in Yii2 when creating an entity via REST?

Question

Yii

The action for rest to create an entity has the following code:

namespace yii\rest;
...
class CreateAction extends Action
{ 
...
    public function run()
    {
        ...
        if ($model->save()) {
            ...
            $response->getHeaders()->set('Location', Url::toRoute([$this->viewAction, 'id' => $id], true));
        } elseif (!$model->hasErrors()) {
...

Question: Why is there $response->getHeaders()->... for the rest of the request? As a result, I am thrown to the actionView, which is not implemented (well, I don’t need it in the condition of this task). And if implemented, then the model will not have a script installed and, accordingly, the fields () method will not return anything.
Maybe I'm doing something wrong?