> For the complete documentation index, see [llms.txt](https://hatchbox.gitbook.io/hatchbox/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hatchbox.gitbook.io/hatchbox/apps/passenger.md).

# Passenger

## Why is Passenger the default webserver?

We're using Passenger by default because not every app uses Puma. Passenger can run *any* Ruby application and is also the most helpful when things go wrong.