Navigating to static HTML page on button click

Hi, 

I am new to GWT.   In my GWT application, I want send a direct request for static html up on a button click and the HTML page should be displayed. I tried below code. I can see that URL is correct but nothing is happening. I expected browser to display static html page but it remains on same page.  How can I do this ?

Code:

 TextButton signoutButton = new TextButton(messages.signoutButton());

        signoutButton.setDecoration(Decoration.PRIMARY);

        signoutButton.addClickHandler(new ClickHandler() {

@Override

public void onClick(ClickEvent event) {

String url = GWT.getHostPageBaseURL() + "logout.html";

RequestBuilder builder = new RequestBuilder( RequestBuilder.GET, url);

try {

Window.alert("URL" + url);

builder.send();

} catch (RequestException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

};

});

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