带有$ resource的角度用户身份验证中出现“unsupported_grant_type”错误

Question

我的问题

使用$ post工作正常，但当我将其更新为$ resource时，

我收到 unsupported_grant_type 的错误。

我尝试过SO的许多解决方案，但无法解决此问题。

以下是我的代码。

控制器

app.factory('authService', ['$http', '$q', 'localStorageService', '$resource', '$rootScope',
    function ($http, $q, localStorageService, $resource, $rootScope) {

    var authServiceFactory = {};

    var _authentication = {
        isAuth: false,
        userName: ""
    };

    var url = function (relativeUrl) {
        return $rootScope.apiBaseUrl + '/api/' + relativeUrl;
    };

    var authResource = $resource(url('account/:id'), null, {
        register: {
            method: 'POST',
            url: url('account/register')
        },
        login: {
            method: 'POST',
            url: $rootScope.apiBaseUrl + '/token'                
        }           
    },
    {
        headers: {
            'Access-Control-Allow-Origin': '*',
            'Content-Type': 'application/x-www-form-urlencoded'
        }
    });

    var _login = function (loginData) {
       // var data = "grant_type=password&username=" + loginData.userName + "&password=" + loginData.password;

        loginData.grant_type = "password";
        var deferred = $q.defer();
        authResource.login($.param(loginData)).$promise
            .then(function (response) {
                localStorageService.set('authorizationData', { token: response.access_token, userName: loginData.userName });

                _authentication.isAuth = true;
                _authentication.userName = loginData.userName;

                deferred.resolve(response);
            });
        return deferred;
    };       

    var _fillAuthData = function () {

        var authData = localStorageService.get('authorizationData');
        if (authData) {
            _authentication.isAuth = true;
            _authentication.userName = authData.userName;
        }
    }

    authServiceFactory.saveRegistration = _saveRegistration;
    authServiceFactory.login = _login;
    authServiceFactory.logOut = _logOut;
    authServiceFactory.fillAuthData = _fillAuthData;
    authServiceFactory.authentication = _authentication;

    return authServiceFactory;
}]);

服务

{{1}}

我从这么多尝试中发现了什么？

我发现，我的请求没有任何标题。