In-depth

General Passenger

• Lightweight Ruby dependency
• Integration modes (Nginx, Apache, Standalone)
• Passenger Standalone engines todo
• Passenger open source vs Passenger Enterprise
• Hooking in to Passenger

General concepts

• About processes
• About environment variables
• Accurately measuring memory usage

Passenger behavior

• How Passenger autodetects applications
• Request load balancing
• Request queueing todo
• How dynamic scaling of application processes works
• Security update check
• Protection against slow clients through buffering todo
• Data reporting mechanism

Passenger's exposed application environment

• Stdin, stdout and stderr channels
• Apache per-request environment variables

• About Meteor support
• Secure HTTP headers

Related guides

• Installation: Supported operating systems and languages
• Developing with Passenger: Turbocaching