Can't read body from response about form-data HOT 3 CLOSED

  form.submit({
        host: "localhost",
        port : 3000,
        path: '/' + rel_url,
        headers: headers

    }, function(err, res) {

        if (err){
            onRequestFailed(err);
        }else{
            var body = '';
            res.on('data', function(chunk) {
                body += chunk;
            });
            res.on('end', function() {
                console.log(body);
                onRequestSucceed(body);
            });
        }

    });