angular指令处理http请求

我有角度指令,接受url获取远程数据:

...

指令本身:

app.directive('myTag', ['$http', function($http) {
return {
    restrict: 'E',
    transclude: true,
    replace: true,  
    //template: '
{{imgres.isUrl}}\'/>
',
    scope:{
        src:"@",            //source AJAX url to dir pictures
    },
    controller:function($scope){
        console.info("enter directive controller");
        $scope.gallery = [];
        $http.get($scope.src).success(function(data){
           console.info("got data");
           $scope.gallery.length = 0;
           $scope.gallery = data;
        });
    }
}

一般来说它可以工作,我可以在FireBug控制台中看到:

enter directive controller
GET http://127.0.0.1/srv1
got data

但是,如果我将指令的第二个实例绑定到另一个url:

...

仅适用于以下日志:

enter directive controller
GET http://127.0.0.1/srv1
enter directive controller
GET http://127.0.0.1/srv2
got data             <-- as usual it relates to first directive

难道你不能帮我解决2指令的问题