Node.js / Socket.io Access-Control-Allow-Origin error on both local and remote site

Question

world ! I'm trying to get a JSON feed to my client, through my node/socket.io server. All I keep getting, locally, or remotely (using nodejitsu) is the following error : XMLHttpRequest cannot load http://jsonfeed.url . Origin http://example.com is not allowed by Access-Control-Allow-Origin.

From my research and testing, it doesn't depend on my browser, but on my server code. please enlighten me!

Server code (i can provide more, but tried to be concise):

var fs = require('fs'),
http = require('http');

//use of a fs and node-static to serve the static files to client

function handler(request, response) {
"use strict";
response.writeHead(200, {
                     'Content-Type': 'text/html',
                     'Access-Control-Allow-Origin' : '*'});
fileServer.serve(request, response); // this will return the correct file
}

var app = http.createServer(handler),
iosocks = require('socket.io').listen(app),
staticserv = require('node-static'); // for serving files

// This will make all the files in the current folder
// accessible from the web
var fileServer = new staticserv.Server('./');
app.listen(8080);

That's it, I have tried everything... Time to call the geniuses!

Answer 1

OK, how do I say this... First thanks to StackOverflow and to those who tried to answer, it's a bit less cold out there than it once was, keep it going.

THEN... It's working. I do not know why, and it's annoying. All I did was removing :

response.writeHead(200, {
                 'Content-Type': 'text/html',
                 'Access-Control-Allow-Origin' : '*'});

Just like that. like it was at the beginning when it was NOT working!

Bonus question, Can somebody tell me why??