endless provides a drop in replacement for the `net/http` stl functions `ListenAndServe` and `ListenAndServeTLS` to achieve zero downtime restarts and code upgrades. The code is based on the excellent post [Graceful Restart in Golang](http://grisha.org/blog/2014/06/03/graceful-restart-in-golang/) by [Grisha Trubetskoy](https://github.com/grisha). I took his code as a start. So a lot of credit to Grisha!