gwt + spring security

I use gwt requestBuilder to query server result, if server-side spring
checked user is not authenticated, it will forward to <form-login
login-page="/gwtapplication.html#!login" , but gwt is not
forwarded to that page. see below

requestBuilder.setCallback(new RequestCallback() {

@Override
public void onError(final Request request, final Throwable
exception) {
resultCallback.onFailure(exception);
}

@Override
public void onResponseReceived(final Request request,
final Response response) {

if(response.getHeader("Content-
Type").toLowerCase().equals("text/html".toLowerCase()))
{

//response.getText() is
/**
Expires Thu, 01 Jan 1970 00:00:00 GMT
Set-Cookie JSESSIONID=1emk892yva1e9;Path=/
Location http://127.0.0.1:8888/gwtapplication.html#!login
Content-Length 0
Server Jetty(6.1.x)

**/

}

}
});

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