Hello! The cache directory must:
1. End with a slash (due to implementation of the php script). 2. Exist or be created manually. 3. Be writeable by php-fpm. The current default value doesn't meet these requirements and leads to broken caching and errors in php-fpm log. The simplest solution is to change it to /tmp/, but for obvious reasons it is not suitable for production use. However, since this service is described as demonstration, I would prefer unsafe default over broken (for now). Also the requirements above should probably be mentioned in the documentation of the service.
