CakePHP 3.6.X not working Session correctly

When using Session in CakePHP 3.6.4 it does not read the session data created on other pages, but on the same page it shows the value.

echo $this->request->getSession()->write('Ref.url', 'valor2');
echo 'Ref: '.$this->request->getSession()->read('Ref.url');

I'm using this way, inside the controller, it works and shows the data on the same page, but when I use the "read" on another page, no content is displayed. As if something was destroying the session. How do I resolve this?

I'm using the built-in php 7.2.5 Server.