chwala trouble on kolab 3.3 with ssl

[Matthias Busch]

It might be interesting to know that in my

/etc/roundcubemail/kolab_files.inc.php

there is no http in the kolab_files_url:

$config['kolab_files_url'] = '/chwala/';

i still tried (yesterday before posting and just now again)

$config['kolab_files_url'] = 'https://' . $_SERVER['HTTP_HOST'] . 
'/chwala/';

as well as

$config['kolab_files_url'] = 'https://' . \$_SERVER['HTTP_HOST'] . 
'/chwala/';
(it was suggested on some bug-report that the $ needs to be escaped)

all without success. still cant use chwala