Communication of Web server and Web server in one nodejs

I have a C++ application as client connect to port 1234,
nodejs hosts App server listening at eg 1234,
same nodejs also hosts a Web server listening at eg 3000,
how do I get the data from App server to Web server?
I've tried to use require('net') to create app server, then use require('socket.io') to connect http client

| web client |<->| nodejs(app+web server) |<->| C++ program |