`301` means "Moved Permanently", so browser caches this redirect, it is used when changing server URL.
`302` means "Found", it is used generally (e.g. redirect top page after
login).
Each of `301`, `302`, `303` and `307` means redict, but they are
different. We could choice those status in case.
Removed `env.redirect` in-favor of `redirect` in-order to make Kemal's
API look more like Sinatra.
Thanks @sdogruyol and @f for introducing me to macros :-).
Binding HTTP::Server to 0.0.0.0