Looks like similar requirement was raised in #3

From the answer on that ticket, one of the limitation would be that this module is directly bound to the tls.Server or net.Server socket level without the http layer

So...
I looked a bit...

the node.js http.Server inherits from net.Server
the node.js https.Server inherits from tls.Server

Which means that when the nodejs-websocket server is created via createServer() it could accept an already existing http or https server socket, instead of creating a new one, if one if provided as option. Calling instanceof tls.TLSSocket/net.Socket could even work for a more generic usage.

var http = require("http")
var ws = require("nodejs-websocket")

var wsServer;
var httpServer = http.createServer();

httpServer.on('upgrade', function (req, socket, head) {
    wsServer = ws.createServer({ socket: socket, upgradeHead: head }, function (conn) {
    	conn.on("text", function (str) {
	    	conn.sendText(str.toUpperCase()+"!!!")
    	})
	    conn.on("close", function (code, reason) {
		    console.log("Connection closed")
    	})
    });
});

httpServer.listen(8001);

It may worth a try

Updated to allow handling upgrade http handshake

Create server follow another http or https server #15

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