title: Symfony2 - forward to external URL with POST data from Event Listener?
body: <p>I use Event Listener from <a href="https://stackoverflow.com/a/11506369/5940177">this SO answer</a> to redirect users with specific roles. But now, for one role I have to redirect user to external link, with some POST data.</p>
  
  <p>Since in <code>onKernelResponse()</code> I have to set <code>$event</code> response and <code>RedirectResponse</code> can't do forward with POST (at least that's what I've been told), I'm a bit lost here. How should I do it?</p>