There are scenarios where your app servers might be varied as well -- I've leveraged reverse proxies in front of a PHP application that had parts in .NET and pa

There are scenarios where your app servers might be varied as well -- I've leveraged reverse proxies in front of a PHP application that had parts in .NET and parts in Go, for instance. Technologies/competencies change as projects evolve, and being able to effortlessly reorganized and reroute is so profoundly powerful.