Getting current URL in java

Hi everyone:
I'm trying to retrieve the current url from a page, but I can't seem to get it right. This is what happens, I have a jsp which calls a tag, within the Tag Handler I manage to get the request object from the jsp:

HttpServletRequest req=(HttpServletRequest) pageContext.getRequest();

Now, my problwm is that when I ask for the url:

String url=req.getRequestURL().toString();

But what I get is the url of the jsp instead of the url of the servlet that called the jsp(i.e. the url showed in the browser's navigation bar).

Any help will be greatfully recieved.

You're looking for getRefererUrl.

Well, I've been looking for getRefererUrl, but couldn't find it. I was hoping you could tell to wish class it belongs.