Cover your head.
Further readings on middlewares can be found here
var hood = ;app;
This will setup sane defaults for most apps. You can also pass options to configure each middleware.
Each middleware is also available individually.
app;app;app;// to use Report-Onlyappapp;
Only applies header if request is secure. Checks
app // DENYapp;app;app;app;
A convenience method when you need to add arbitrary headers to all requests.