Headers not setting with redirect using node.js / Express
===

I am relatively new to node.js, Express, and mobile development, and have run into a problem that I think has to do with sending headers with Express.  

The user starts at the home page '/', not logged in, then clicks a button to go to the sign-in page.  When they submit their username and password to '/validate_signin', they should be redirected back to the home page, this time with the home page showing up differently because they are logged in.

The redirection worked like this:

    res.redirect('/');

This works fine on my laptop, but on my mobile phone it redirects to '/', in its old state, presumably because of caching. If I refresh the page on the phone, '/' will show up as it should.

I found this post:
http://stackoverflow.com/questions/49547/making-sure-a-web-page-is-not-cached-across-all-browsers

Have tried to set headers in the following two ways (separately), but they don't seem to be sending:

    res.header("Cache-Control", "no-cache, no-store, must-revalidate");
    res.header("Pragma", "no-cache");
    res.header("Expires", 0);

    res.writeHead(302, {
        "location": "/",
        "Cache-Control" : "no-cache, no-store, must-revalidate",
        "Pragma": "no-cache",
        "Expires": 0
    });

Here are the headers that I am currently receiving:

    HTTP/1.1 304 Not Modified
    X-Powered-By: Express
    Date: Fri, 13 Jul 2012 17:35:18 GMT
    Cache-Control: public, max-age=0
    Last-Modified: Fri, 13 Jul 2012 12:32:12 GMT
    Etag: "3223-1342182732000"
    Accept-Ranges: bytes
    Connection: keep-alive

Any ideas?

Many thanks.