Getting the post data in connect route

I have a code that uses connect that acts as a server and handles post data.How do i query the post data from my response.Below is my code

    connectRoute = require('connect-route'),
    connect = require('connect'),
    app = connect();
   .use(connectRoute(function (router) {
    router.post('/aaaa', function (req, res, next) {
    global.POST_VALUE='';
            //postMethod=req.method;
            var postData = '';
            req.addListener('data', function(chunk)
            {
                postData += chunk;

            });

            req.addListener('end', function()
            {

                global.POST_VALUE=postData;


            });


              a(req,res);
        })

Can i get the global.POST_VALUE across different functions? If so will it change if there are multiple requests to the nodejs server? I am stuck here any help will be much helpful