Redirect to another action in an interceptor in struts 2

Question

I am currently in the process of learning Struts 2 and I am currently building a simple application where unverified users are redirected to a login form.

I have a login

Answer 1

If you need to use send redirect, return null to avoid this problem (example redirecting from www.domain.com to domain.com):

public String intercept(final ActionInvocation invocation) throws Exception {

    String url=RequestUtil.getURLWithParams();  //you should implement this
    int index=url.indexOf("www");
    if (index!=-1 && index<10) {
        //Note: <10 to check that the www is in the domain main url
        //https://localhost:8443/mycontext/myaction.action?oneparam=http://www.youtube.com/user/someuser
        String redirection=url.replaceFirst("www\\.", ""); 
        LOG.debug("Redirection from "+url+" to "+redirection);
        RequestUtil.getResponse().setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
        RequestUtil.getResponse().sendRedirect(redirection);
        return null;
    }
    return invocation.invoke();
}