ASP.NET WebApi batching + durandal

batch.js

define(function () {

    var url = '/api/batch',
        requests = [],
        timeout;

    return {
        url: url,
        get: request('GET'),
        post: request('POST'),
        delete: request('DELETE'),
        put: request('PUT'),
    };

    function request(type) {
        return function (url, data) {
            var dfd = $.Deferred();
            requests.push({
                promise: dfd,
                data: {
                    type: type,
                    url: url,
                    data: data
                }
            });
            queueRequest();
            return dfd.promise();
        };
    }

    function queueRequest() {
        if (!timeout) {
            timeout = setTimeout(function() {
                var requestsCopy = requests;
                requests = [];
                console.log('send batch');
                
                // downloaded from https://github.com/volpav/batchjs/blob/master/src/batch.js
                $.ajaxBatch({
                    url: url,
                    data: $.map(requestsCopy, function (request) { return request.data }),
                    complete: function (xhr, status, result) {
                        $.each(result, function (i, result) {
                            if (result.status >= 400) {
                                requestsCopy[i].promise.reject(result.data);
                            }
                            else {
                                requestsCopy[i].promise.resolve(result.data);
                            }
                        });
                    }
                });
            }, 1);
        }
    }
});