Why do I get ReferenceError: $http is not defined when working with "web worker"?

Question

Angular

I implement work with the worker through services ('ng-vkThread', 'ngWebworker'), in this example - 'ngWebworker', but I get the same error: ReferenceError: $http is not defined
Help, what is the problem?
app.js

var app = angular.module('contactList', ['lumx','ngSanitize', 'ngCsv', 'ng-vkThread','ngWebworker']);

app.controller('ReadFileController', ['$scope','$http','vkThread','Webworker', function ($scope, $http, vkThread, Webworker) {

                var foo = function (content) {

                                $http.post('/anguler-tasks-contacts/addContactData.php',{last_name:1, name:2, patronymic_name:3, address:4, telephone:5, url:6, description:7, completed:'false'}).then(function(response) {


                        $scope.contactslist.push({
                                id: response.data[0].id,
                                last_name: response.data[0].last_name,
                                name: response.data[0].name,
                                patronymic_name: response.data[0].patronymic_name,
                                address: response.data[0].address,
                                telephone: response.data[0].telephone,
                                url: response.data[0].url,
                                description: response.data[0].description,
                                completed: response.data[0].completed
                        });


                });

                                return 1;
                }


        $scope.readContent = function($fileContent){

            $scope.content = $fileContent;

            var myWorker2 = Webworker.create(foo);
            myWorker2.run($scope.content).then(function(result) {
                console.log(result);
            });

        };

}]);