I am having trouble with a Node.js http request. (A bigger question I will ask about later if I can't figure it out).

I have code that I modified from and an example and I don't understand what the response.on means. As read more about http in Node.js (Anatomy of an HTTP Transaction) I don't see people using examples with 'response.on'. I think I know but I want to clarify. Oh I am using Express.js too.

Thanks

Below is the code I am using to try and call the BART api I need a response from.

...

// Real Time Departure from a given station

router.route('/departTimeStation')

.get(function(req, res) {

    vCmd = 'etd';

    vOrig = req.query.vOriginStation;

    vDir = 'n'; // [NOTE] - 'n' or 's', north or south, OPTIONAL

    vPlat = 1; // [NOTE] - 1 to 4, number of platform, OPTIONAL



    var xoptions = {

        host: 'api.bart.gov',

        path: '/api/etd.aspx?cmd=' + vCmd + '&orig=' + vOrig + '&key=' + config.bart.client

    };



    var xcallback = function(response) {



        response.on('data', function(chunk) {

            vParsed += chunk;

        });



        response.on('end', function() {

            parseString(vParsed, function(err, result) {

                vShow = JSON.stringify(result);

                vTemp = result;

            });

        });

    };

    http.request(xoptions, xcallback).end();

    return res.send (vTemp)

});

...