Domains are officially deprecated

[tomaskulich]

https://nodejs.org/api/domain.html

Sadly, node domains are now deprecated so you probably shouldn't use them (nor you should use this middleware) :(

To overcome this drawback I created coroutine-based library for writing asynchronous code: https://github.com/vacuumlabs/yacol. If you use this in your project, you can have all the domain goodness with quite decent semantics around it.