In the slave Caddy configuration you can use parameters that will be replaced during instantiation. They should be entered as python templates parameters ex: ``%(parameter)s``:
* ``cache_access`` : url of the cache. Should replace backend url in configuration to use the cache
* ``access_log`` : path of the slave error log in order to log in a file.
* ``error_log`` : path of the slave access log in order to log in a file.
