使用RequestBuilder调用请求时出现问题

我的密码是

    String url = "http: gd.geobytes.com/gd?after=-1&variables=GeobytesCountry,GeobytesCity";
    RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, URL
            .encode(url));



    try {
        Request request = 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) {

                System.out.println(response.getText() + "Response");

                if (200 == response.getStatusCode()) {
                    Window.alert(response.getText());
                } else {
                    Window.alert(response.getText());
                }
            }
        });
    } catch (RequestException e) {
        e.printStackTrace();
    }

com.google.gwt.http.client.RequestPermissionException:URL http://gd.geobytes.com/gd?after=-1&variables=GeobytesCountry,GeobytesCity 无效或违反同一来源安全限制 位于com.google.gwt.http.client.RequestBuilder.doSend(RequestBuilder.java:378) 位于com.google.gwt.http.client.RequestBuilder.sendRequest(RequestBuilder.java:254) 位于com.ip.client.IpAddressTest.onModuleLoad(IpAddressTest.java:46) 在sun.reflect.NativeMethodAccessorImpl.invoke0(本机方法) 在sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 位于java.lang.reflect.Method.invoke(Method.java:597) 位于com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:369) 位于com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:185) 在com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:380) 位于com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:222) 原因:com.google.gwt.http.client.RequestException:(NS\u ERROR\u DOM\u BAD\u URI):拒绝访问受限制的URI