Question

我有一个GWT应用程序，我希望以jSON格式从endomondo获取数据，我可以通过以下IRL获得它：

http://api.mobile.endomondo.com/mobile/api/workout/list?authToken=XXXXXXXXXX

我会得到像

这样的数据

{"data":[{"duration_sec":2710,"sport":0,"speed_kmh_avg":11.721935764889876,"device_workout_id":"6588152507813057122","feed_id":155634169,"sport2":0,"id":192960126,"altitude_m_max":227.3,"hydration":0.35771,"altitude_m_min":145.5,"has_playlist":false,"burgers_burned":1.075926,"start_time":"2013-05-21 18:57:04 UTC","calories":581,"speed_kmh_max":26.281,"distance_km":8.824012756347656,"has_points":true},]}

但不知怎的，通过使用GWT http请求构建器调用它我不能这样做。我应该在代码中更改什么？

String url = "http://api.mobile.endomondo.com/mobile/api/workout/list?authToken=XXXXXXXXXX";
RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, url);


try {
      Request myrequest = builder.sendRequest(null, new RequestCallback() {

        public void onError(Request request, Throwable exception) {
           // Couldn't connect to server (could be timeout, SOP violation, etc.)

        }

        public void onResponseReceived(Request request, Response response) {
          if (200 == response.getStatusCode()) {
              trainingsJSON = JSONParser.parseStrict(response.getText());
              trainingsString = response.getText();
            Label l = new Label();
            l.setText("200 erros status code JSON DATA from endomondo " + response.getText()) ;

            RootPanel.get().add(l);
          } else {
            // Handle the error.  Can get the status text from response.getStatusText()
                Label l = new Label();
                l.setText("JSON DATA from endomondo 3rror part " + response.getText()) ;

                RootPanel.get().add(l);                   
          }
        }       
      });
    } catch (RequestException e) {
      // Couldn't connect to server        
    }

修改

我尝试过添加

builder.setHeader("Access-Control-Allow-Origin", "*");

但没有运气。

Answer 1

当您使用GWT发出CORS请求时，您不必为请求添加任何额外的标头。您必须做的是检查服务器是否支持来自您站点的CORS请求。

如果您管理网站http://api.mobile.endomondo.com，则必须更改服务器代码，以便在客户端发送OPTION请求时返回相应的CORS标头。

对于java服务器端，您有一个如何使用Filter在此page中处理CORS的示例。

请注意，CORS仅适用于现代浏览器（EDITED：实际上某些浏览器的旧版本支持它。请参阅下面@Thomas评论中的浏览器列表）。

GWT的http请求构建器返回空响应

1 个答案: