Error loading webpage while parsing JSON-string

Please have a look at my code where I'm trying to compress data using connect.compress middleware. How can I parse JSON string in browser to get the decompressed data. When I try to hit localhost:2080 I'm getting Page loading error.

Client code

var options = {
host: '127.0.0.1',
port: 2080,
path: "/",
headers:{
'accept-encoding': 'gzip'
}
};
var req = http.request(options, function(res) {
console.log('STATUS: ' + res.statusCode);
console.log('HEADERS: ' + JSON.stringify(res.headers));
var data = '';
res.on('data', function (chunk) {
data += chunk;  
});
res.on('end', function (chunk) {
var data2 = JSON.parse(data);
console.log(data2.app_id);
});
});

Server Code

app = connect();
app.use(connect.compress(console.log("compressed data")))
app.use(connectDomain())
.use(connect.query())
.use(connectRoute(function (router) {

router.get('/', function (req, res) {
            var acceptEncoding = req.headers['accept-encoding'];

              if (acceptEncoding.match(/\bdeflate\b/)) {
                    res.setHeader('content-encoding', 'deflate');
              } else if (acceptEncoding.match(/\bgzip\b/)) {
                    res.setHeader('content-encoding', 'gzip');
              }
            console.log(res._headers);  
            res.setHeader('Content-Type', 'application/json');
            res.end('{"app_id": "A3000990"}');
            })
            }))

.use(function(err, req, res, next) {
    res.end(err.message);
  });

http.createServer(app).listen(2080);

We can't control the browser. It either sends the Accept-encoding: gzip, deflate header or it doesn't. So can we get compress data using connect.compress().

Any help will be really helpful

Thanks