title: Clear users' browser cache upon deploy symfony2
body: <p>I have a problem with my users' cache with my symfony2 application: every time I deploy updates to the application, users have to clear their browser cache in order to get the new styles and javascript.</p>
  
  <p>It has started happening after I've set up an architecture with an AWS ECS cluster running 2 servers with my docker images. And I have a Caddy reverse proxy that load-balances these two servers.</p>
  
  <p>I don't understand where the problem is occurring, it is Caddy caching the requests, is it Twig or do you have any other ideas?</p>
  
  <p>Obviously I run <code>php bin/console cache:clear --env=prod</code> when deploying.</p>