Getting the URL of the current page in Grails

In a Grails application I'd like to send a user from page A, then to a form on page B and then back to page A again. To keep track of which URL to return to I send a "returnPage" parameter to page B containing the URL of page to return to (page A). Currently I'm using request.getRequestURL() on page A to retrieve the page's URL. However, the URL I get from getRequestURL() does not correspond to the URL the end-user has in his/hers address bar: ``` request.getRequestURL() == "http://localhost:8080/something/WEB-INF/grails-app/views/layouts/main.gsp" URL in address bar == "http://localhost:8080/something/some/thing" ``` How do I obtain the "end-user" URL?