if ($user->hasRole('anonymous')) {
            if ($loginrequired) {
                $content = [
                    '#markup' => '<p> Login required. <a href="/user/login">Click Here to Login</a></p>',
                ];
                return $content;
            }
    }
    $content = [
        'header'   => [
            '#markup' => $header_text,
        ],
        '#cache'   => [
            'max-age' => 0,
        ],
        $webform,
    ];
    return $content;

'#cache'    => [
            'max-age'  => 0,
            'contexts' => ['user.roles']
        ],

'#cache'    => [
            'max-age'  => 0,
            'contexts' => ['user.roles:anonymous']
        ],