How can I force a browser caching in Cake 3.2?

I have an avatar image in my navbar (menu) that is served by a cake
response action:

public function showAvatar($funcionario_id) {
        $this->response->file(ROOT .
"/files/funcionarios/avatars/$funcionario_id . '.jpg'");

        $this->response->cache('-1 minute', '+5 days');

        return $this->response;
    }

But in firebug, I see that this image is not cached in browser.

Am I doing something wrong?

Thanks You in advance

Nilson

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