Proposal: Add a public API constant to net/http/https Server telling whereas the server is listening or not

[cusspvz]

It is not the first time that I've faced a situation where I had to check if a server is listening for connections.

I'm familiar with lib/net, so unfortunately I had to use ._handle with a little bit of tweaks.
Is there any reason why you guys didn't added one?

My proposal is to place up a method (maybe called .listening()) on net.Server's prototype that would return a bool.

[jhamhader]

If this feature is to be added, I would be glad to work on it.

[cusspvz]

I've already attached a PR with proposed changes.

[evanlucas]

Closing as 5ef9989 just landed