Cant get digest auth to work with node.js

I'm trying to get a simple (!) digest authentication working with node js using an an API from gathercontent.com.

Everything seems to be working except I still get a "Wrong credentials" response that looks like this:

{ success: false, error: 'Wrong Credentials!' }

The code looks like this:

var https = require('https'),
    qs = require('querystring');
apikey = "[my api key goes in here]",
    pwd = "[my password goes in here]",
    crypto = require('crypto');


module.exports.apiCall = function () {

    var options = {
        host:'abcdefg.gathercontent.com',
        port:443,
        path:'/api/0.1/get_pages_by_project/get_me',
        method:'POST',
        headers:{
            "Accept":"application/json",
            "Content-Type":"application/x-www-form-urlencoded"
        }
    };

    var req = https.request(options, function (res) {

        res.on('data', function (d) {
            var creds = JSON.parse(d);


            var parsedDigest = parseDigest(res.headers['www-authenticate']);
            console.log(parsedDigest);
            var authopts = {
                host:'furthercreative.gathercontent.com',
                port:443,
                path:'/api/0.1/get_pages_by_project/get_me',
                method:'POST',
                headers:{
                    "Accept":"application/json",
                    "Content-Type":"application/x-www-form-urlencoded",
                    "Authorization" : getAuthHeader(parsedDigest, apikey, parsedDigest['Digest realm'], pwd)
                }
            };

            console.log(authopts);
            console.log('\n\n\n');
            var req2 = https.request(authopts, function (res2) {
                console.log("statusCode: ", res2.statusCode);
                console.log("headers: ", res2.headers);


                res2.on('data', function (d2) {
                    var result = JSON.parse(d2);

                });
            });

            req2.end();



        });

    });


    req.write('id=1234');

    req.end();

    req.on('error', function (e) {
        console.error(e);
    });

};

function parseDigest(s){

    var parts = s.split(',');
    var obj = {};
    var nvp = '';

    for(var i = 0; i < parts.length; i++){

        nvp = parts[i].split('=');
        obj[nvp[0]] = nvp[1].replace(/"/gi, '');
    }



    return obj;
}

function getAuthHeader(digest, apikey, realm, pwd){
    var md5 = crypto.createHash('md5');
    var s = '';

    var nc = '00000001';
    var cn = '0a4f113b';

    var HA1in = apikey+':'+realm+':'+pwd;
    md5 = crypto.createHash('md5');
    md5.update(HA1in);
    var HA1out = md5.digest('hex');

    var HA2in = 'POST:/api/0.1/get_pages_by_project/get_me';
    md5 = crypto.createHash('md5');
    md5.update(HA2in);
    var HA2out = md5.digest('hex');

    md5 = crypto.createHash('md5');
    var respIn = HA1out + ':' + digest.nonce + ':'+nc+':'+cn+':'+digest.qop+':'+ HA2out;
    md5.update(respIn);
    var resp = md5.digest('hex');


    s = [   'Digest username="',apikey,'", ',
        'realm="',digest['Digest realm'],'", ',
        'nonce="',digest.nonce,'", ',
        'uri="/api/0.1/get_pages_by_project/get_me", ',
        'cnonce="',cn,'", ',
        'nc="',nc,'", ',
        'qop="',digest.qop,'", ',
        'response="',resp,'", ',
        'opaque="',digest.opaque,'"'].join('')

    return s;
}

I'd try and Curl to it but I'm not sure how!

Any help appreciated!