Access to internal listener variable

[bendikro]

When passing a listening address with port 0, a suiting port number is chosen. However, finding out which port was chosen requires access to the listener variable of type net.Listener (?). Private variables makes this to difficult to solve without hacking the library directly.

[daaku]

At this point I'd suggest not adding new features here and instead using the standard library support for graceful shutdown that was added in Go 1.8:

https://golang.org/pkg/net/http/#Server.Shutdown

[bendikro]

I'm not quite sure I understand how that will help figuring out which port is listened on?