Question about www form.

Hi, I am trying to post the data with the url to my webserver and it's working perfectly. But the problem is getting the response data from the request url. How can I get it in Unity?

Here is my example code which is doing Post method for signing in process and I have no idea of getting the response data from that.

    string url = "http://testWebServer.com/sign_in";
    WWWForm form = new WWWForm();
    form.AddField("email", email);
    form.AddField("password", password);

    // Post the URL to the site and create a download object to get the result.
    WWW www = new WWW(url, form); 
    yield return www;

    if (www.error != null)
    {
        bGamerSignedIn = false;
        print("There was an error signing in your user: " + www.error);
    }
    else
    {
        bGamerSignedIn = true;

        //Wrong 
        //Error Authentication header not found.
        if (www.isDone)
            print((string)www.data);

        print("Gamer Sign In completed");
    }

www.responseheaders catch all the response data from the POST method.. it's all done now..