} else if (request.getParameter("action") != null) {
if (request.getParameter("action").equals("revoke")) {
// The user is revoking their token.
authManager.revokeToken();
nextUrl = MainServlet.MAIN_URL;
} else if (request.getParameter("action").equals("authorize")) {
// The user is starting the AuthSub authorization process.
nextUrl = authManager.getAuthorizationRedirectUrl(request.getRequestURL());