NodeJS help proxy TCP port data to web socket - node.js

Question

I'm trying to proxy json data from a private TCP port 13854 to a public web socket on port 8080. Why can't I get any data when browsing http://localhost:8080?
var http = require('http').createServer(httpHandler),
fs = require("fs"),
wsock = require('socket.io').listen(http),
tcpsock = require('net');
var proxyPort = 8080;
var serviceHost = 'localhost';
var servicePort = 13854;
function httpHandler (req, res) {
res.setHeader("Access-Control-Allow-Origin", "http://example.com");
res.end();
}
http.listen(proxyPort);
console.info("HTTP server listening on " + proxyPort);
wsock.sockets.on('connection', function (socket) {
var tcpClient = new tcpsock.Socket();
tcpClient.setEncoding("ascii");
tcpClient.setKeepAlive(true);
tcpClient.connect(servicePort, serviceHost, function() {
console.info('CONNECTED TO : ' + serviceHost + ':' + servicePort);
tcpClient.on('data', function(data) {
data = "" + data
//send format request to socket
if (data[0] != '{'){
s.write(JSON.stringify({
enableRawOutput : false,
format : "Json"
}) + "\n");
return;
}
console.log('DATA: ' + data);
socket.emit("httpServer", data);
});
tcpClient.on('end', function(data) {
console.log('END DATA : ' + data);
});
});
socket.on('tcp-manager', function(message) {
console.log('"tcp" : ' + message);
return;
});
socket.emit("httpServer", "Initial Data");
});
THANKS!

Answer 1

First of all, change the line
res.setHeader("Access-Control-Allow-Origin", "http://example.com");
to
res.setHeader("Access-Control-Allow-Origin", "*");
Because you are browsing to localhost, your request will be rejected because the origin is not http://example.com.
Secondly, in order to receive data, you must setup a web socket connection from the client. Just browsing to http://localhost:8080 creates an http connection and not a web socket connection.
I propose to create an HTML page locally and use that by double-clicking on it (instead of going through your server); later you can host the page on your node.js server.
Look at the examples on http://socket.io to correctly create a socket.io client.

Answer 2

I solved the problem by reorganizing my code and keeping the sockets separated. For whatever reason, it seems that Access-Control-Allow-Origin is not needed. I am using a Chrome plugin called "Simple Web Socket Client" to get around needing to write my own client.
var ws = require("nodejs-websocket"),
net = require("net");
var server = ws.createServer(function(conn) {
conn.on("close", function(code, reason) {
console.log("Connection closed");
});
}).listen(8080);
var tcp = new net.Socket();
console.log('connecting to 127.0.0.1:13854');
tcp.connect(servicePort, '127.0.0.1', function() {
//this socket requires sending data on connection
tcp.write(JSON.stringify({
enableRawOutput: false,
format: "Json"
}) + "\n");
});
tcp.on("data", function(data) {
if (server == null || server.connections == null) {
return;
}
//broadcast message:
server.connections.forEach(function(conn) {
conn.sendText(data);
});
}