You are talking about Phusion Passenger Standalone. That is a third mode, which kind of behaves like it wraps Nginx. First first two modes, Phusion Passenger f

You are talking about Phusion Passenger Standalone. That is a third mode, which kind of behaves like it wraps Nginx. First first two modes, Phusion Passenger for Apache and Phusion Passenger for Nginx, behave like Apache/Nginx modules.