AngularJS: Submitting JSON using a MIME POST

gistfile1.txt

        return $http({
            method: "POST",
            url: "/2/projects?accessToken=" + $userService.accessToken,
            // The undefined Content-Type is intentional; with that, the browser will genearate
            // the MIME boundaries and set the content type later.
            headers: {'Content-Type': undefined },
            transformRequest: function (data) {
                var formData = new FormData();
                formData.append("project", angular.toJson(postVars));
                return formData;
            },
        }).then(function (response) {
            console.log("ServiceClient added project: %o", response);
            return response;
        }, function (reason) {
            console.log("ServiceClient failed adding project: %o", reason);
        });