A Controller servlet may perform either a forward or a redirect operation at the end of processing a request.
Forward
* forward is performed internally by the servlet
* the browser is completely unaware that it has taken place, so its original URL remains intact
* any browser reload will simple repeat the original request, with the original URL
Redirect
* redirect is a two step process, where the web application instructs the browser to fetch a second URL, which differs from the original
* a browser reload of the second URL will not repeat the original request, but will rather fetch the second URL
* redirect is always slower than a forward, since it requires a second browser request
* beans placed in the original request scope are not available to the second request