拦截器中的AngularJS头授权格式

我是个新手。我正在实现基于令牌的授权。后端开发人员希望我通过标头发送令牌 以这种格式{auth_token:whatever}。我的问题是我的标题配置是否遵循正确的fomat

angular.module('sampleModule').factory('httpRequestInterceptor',
     ['$localStorage', function($localStorage) //I'm using the ng-storage library
    {
    return {
    request: function($config) {
     if( $localStorage.accessToken )
     {
      $config.headers['auth_token'] = $localStorage.accessToken; //is this following my backend developer's format {auth_token: whatever}? 
     }


 return $config;
}
};
}]);