close
Stops the server from accepting new connections and keeps existing connections. This function is asynchronous, the server is finally closed when all connections are ended and the server emits a 'close'
event. The optional callback
will be called once the 'close'
event occurs. Unlike that event, it will be called with an Error
as its only argument if the server was not open when it was closed.
Since
v0.1.90
Parameters
callback
Called when the server is closed.