Cache Control header is used to improve site performance for authenticated user when NginX is used. It send HTTP Cache Control header in those page allowed to be served in cache. This module per se does not create any cache data. By sending right cache header, NginX can serve requests of logged in users with cache more aggressively.
This module provide the domain wise setting for the aggregation and compression of css and js files. It works when we do not set any BANDWIDTH OPTIMIZATION. If this setting is checked then it will be not work as domain wise. It will work as it work by default.