http res.on('close') never called for some GET requests

Dear community,

sorry for writing again about problems I experienced with Espruino. I used the latest build of 1.75.

I experienced that the "close" event of the http response is not raised for the same get request. No matter how often I try. On the other side I am using the Express JS framework. With other HTTP clients it works well.

    var request = function() {
        var body = "";
        var options = {
            method: 'GET',
            host: '192.168.0.11',
            port: 3000,
            path: "http://localhost:3000/api/Entities/54fabe55ef581d7d5f8bcac1/tasks?filter[where][active]=true&filter[fields][id]=true&access_token=I9sbI5cy6m1gHONeNmCHULGX4CwSGBzC0RDdnPDCfMW4or2UmDyxWg0ZbnQAT1yN",
            headers: {
                "Content-Type": "application/json",
                "Content-Length": body.length
            }
        };
        var contents = "";
        var req = require('http').request(options, function(res) {
            console.log(res);
            res.on('data', function(data) {
                contents += data;
            });
            res.on('close', function() {
                console.log('CLOSE');
                if(res.statusCode === "200" || res.statusCode === "204") {
                    console.log('OK');
                } else {
                    console.log('FAIL');
                }
                contents = "";
            });

        });
        req.on('error', function(e) {
            console.log('Error');
        });
        req.write(body);
        req.end();
    };

The response looks ok:

{
  "headers": {
    "X-Powered-By": "Express",
    "Vary": "Origin, Accept-Encoding",
    "Access-Control-Allow-Credentials": "true",
    "Content-Type": "application/json; charset=utf-8",
    "Content-Length": "2",
    "ETag": "W/\"2-d4cbb29\"",
    "Date": "Wed, 11 Mar 2015 13:30:53 GMT",
    "Connection": "close"
   },
  "httpVersion": "1.1",
  "statusCode": "200",
  "statusMessage": "OK",
  "#ondata": function (b) {l+=b}
 }

How can I handle such problems with the http class of Espruino? What is the problem, that the "close"-event handler is not getting called?

Best,

Tobias