It'd be able to serve files just like normal, but at large scales smart companies use a big CDN and don't do their own file serving. The economies of scale are

It'd be able to serve files just like normal, but at large scales smart companies use a big CDN and don't do their own file serving. The economies of scale are just not there to do it yourself. Mongrel2's advantage is its focus on apps. Combining HTTP, jssocket, and websockets seamlessly on one port means you can get the best of req/response and async operations in your GUIs.