That's not enough, because this would allow only one unprivileged user to bind to the HTTP port (in this case - 8080). Another user trying to bind to the same port would get an error. So for this scenario the author is talking about a custom solution with a reverse proxy would probably work best - getting all requests directed at 80 and distributing them to as many servers as necessary.
My solution was to only put one HTTP server on a machine. I agree that a reverse proxy is the solution for those really wanting HTTP multi-tenancy on individual machines. But is this a really in-demand use case?
