Facebook API有不同的回应

Question

我使用Facebook Graph API使用javascript fetch方法请求一些用户数据。我在尝试使用Graph API Explorer https://developers.facebook.com/tools/explorer时返回的响应与返回到fetch方法的响应不同的问题。

请求是：https://graph.facebook.com/v2.8/me?fields=birthday%2Cemail%2Cage_range%2Cabout%2Cgender%2Cfirst_name%2Clast_name%2Clocation%7Blocation%7D%2Ccover%2Cpicture.height(800).width(800)%2Chometown%7Blocation%7D&access_token=MY_ACCESS_TOKEN

在资源管理器中，响应返回了所有请求的数据，而在获取方法中，生日，位置和家乡缺失。那么这些反应差异背后的原因是什么？

以下是图谱API响应：

{
   "id": "10152311252041311",
   "birthday": "12/11/1992",
   "age_range": {
      "min": 21
   },
   "gender": "male",
   "first_name": "Karim",
   "last_name": "Elbawab",
   "location": {
      "location": {
         "city": "Cairo",
         "country": "Egypt",
         "latitude": 30.0581,
         "longitude": 31.2289
      },
      "id": "115351105145884"
   },
   "cover": {
      "id": "10153054290206311",
      "offset_y": 36,
      "source": "https://scontent.xx.fbcdn.net/v/t31.0-8/s720x720/11080657_10153054290206311_8236239774331416126_o.jpg?oh=7a5e55ce637ddbcbdacb485c5830bbaf&oe=5998BAC0"
   },
   "picture": {
      "data": {
         "height": 958,
         "is_silhouette": false,
         "url": "https://scontent.xx.fbcdn.net/v/t1.0-1/c1.0.958.958/14492344_10154345907211311_2194946159496032335_n.jpg?oh=27591ffb185acde25518df742f7cbf68&oe=598BA899",
         "width": 958
      }
   },
   "hometown": {
      "location": {
         "city": "Port Said",
         "country": "Egypt",
         "latitude": 31.2667,
         "longitude": 32.3
      },
      "id": "106225446079687"
   }
}

以下是我如何处理获取请求：

var url = "https://graph.facebook.com/v2.8/me?fields=birthday%2Cemail%2Cage_range%2Cabout%2Cgender%2Cfirst_name%2Clast_name%2Clocation%7Blocation%7D%2Ccover%2Cpicture.height(800).width(800)%2Chometown%7Blocation%7D&";
    url += "access_token=" + accessToken.value;

    fetch(url,{
        method:"GET"
    }).then(function(result){
        var user_info = JSON.parse(result._bodyInit);
        authentication_api.loginWithFacebook(user_info).then(function(res) {
            callback(res);
        });
    }).catch(function(error){
        console.log("Error: " + error);
        callback(error);
    });
}

获取响应：

{"type":"default","status":200,"ok":true,"statusText":"OK","headers":{"map":{"cache-control":["private, no-cache, no-store, must-revalidate"],"x-fb-deb:["kHzlkaPnR7TExQXruPW/ibxz09g8LxiGsofdsFZVCUE4/ij1sebOSAcyn16osY3Q+4czC8MUT1Er5vrr3mueHg=="],"pragma":["no-cache"],"expires":["Sat, 01 Jan 2000 00:00:00 GMT"],"vary":["Accept-Encoding"],"x-fb-tracd":["G9ozccWmdM/"],"x-fb-rev":["2950242"],"x-android-selected-protocol":["http/1.1"],"x-android-response-source":["NETWORK 200"],"connection":["keep-alive"],"x-android-sent-millis":["1491911956237" content-type":["text/javascript; charset=UTF-8"],"date":["Tue, 11 Apr 2017 11:59:17 GMT"],"facebook-api-version":["v2.8"],"etag":["\"515d42cd12052847a3f24b113f810035508e12be\""],"null":["HTTP/1.1 2 OK"],"x-android-received-millis":["1491911956438"],"access-control-allow-origin":["*"]}},"url":"","_bodyInit":"{\"age_range\":{\"min\":21},\"gender\":\"male\",\"first_name\":\"Karim\",\"last_name\" Elbawab\",\"cover\":{\"id\":\"10153054290206311\",\"offset_y\":36,\"source\":\"https:\\/\\/scontent.xx.fbcdn.net\\/v\\/t31.0-8\\/s720x720\\/11080657_10153054290206311_8236239774331416126_o.jpg?oh=755ce637ddbcbdacb485c5830bbaf&oe=5998BAC0\"},\"picture\":{\"data\":{\"height\":958,\"is_silhouette\":false,\"url\":\"https:\\/\\/scontent.xx.fbcdn.net\\/v\\/t1.0-1\\/c1.0.958.958\\/14492344_10154345211311_2194946159496032335_n.jpg?oh=27591ffb185acde25518df742f7cbf68&oe=598BA899\",\"width\":958}},\"id\":\"10154881281451311\"}","_bodyText":"{\"age_range\":{\"min\":21},\"gender\":\"male\",\"first_ame\":\"Karim\",\"last_name\":\"Elbawab\",\"cover\":{\"id\":\"10153054290206311\",\"offset_y\":36,\"source\":\"https:\\/\\/scontent.xx.fbcdn.net\\/v\\/t31.0-8\\/s720x720\\/11080657_1015305429020631236239774331416126_o.jpg?oh=7a5e55ce637ddbcbdacb485c5830bbaf&oe=5998BAC0\"},\"picture\":{\"data\":{\"height\":958,\"is_silhouette\":false,\"url\":\"https:\\/\\/scontent.xx.fbcdn.net\\/v\\/t1.0-1\\/0.958.958\\/14492344_10154345907211311_2194946159496032335_n.jpg?oh=27591ffb185acde25518df742f7cbf68&oe=598BA899\",\"width\":958}},\"id\":\"10154881281451311\"}"}