title: Semantics of "?faces-redirect=true" in <commandlink action=...> and why not use it everywhere
body: <p>I would like to understand what are the semantics behind appending the <code>"?faces-redirect=true"</code> in the action property of a <code>&lt;h:commandlink&gt;</code> tag in JSF2.0. Whether with it or with out it, the application indeed navigates to the target page specified in the action. So at first glance it seems that the only effect is cosmetic, i.e. to provide feedback to the user (if he is looking at the browser's visited URL) that he has moved to a new page. But if it is so innocuous and side-effects-free I cannot see why it is not the default behaviour. I suspect that it has to do with the post-based mechanism of JSF2.0. I 've noticed when browsing through a JSF application that the URLs one sees at his browser (when <code>?faces-redirect=true</code> is not used) are the ones of the "previous" "page".</p>
  
  <p>meta-NB. I am behind a firewall and plagued with the "SO requires external JavaScript from another domain" issue so I apologize for the absence of formatting. I will also provide feedback on your answers in a few hours, when I can access from another domain.</p>