add middleware Raxx.EnforceHTTPS

[CrowdHailer]

middleware to enforce connections use https, redirecting all requests via http. It should also set the HTST (strict transport header). See details in

• plug https://github.com/elixir-plug/plug/blob/master/lib/plug/ssl.ex
• rack https://github.com/tobmatth/rack-ssl-enforcer

[CrowdHailer]

NOTE: when this middleware is part of an application started listening to a tcp socket no request will ever hit the application. The redirection will be to a second running server

[CrowdHailer]

Phoenix :force_ssl just falls back to Plug.SSL https://github.com/elixir-plug/plug/blob/master/lib/plug/ssl.ex

However there are some useful docs on the consequenses of using strict transport security headers.

https://github.com/phoenixframework/phoenix/blob/596626d9a21c56198c8449250df9c1b1709cf75b/guides/docs/endpoint.md#L106