The basic idea of all just* packages is to
A) Configure their config structures in main.go or wherever you set the http handlers.
B) Import them (or an interface that supports a class of them) when defining your handler.
C) Negotiate with the configurations that main.go has supplied and...
D) Use a closure to return a HandlerFunc for http.HandleFunc or initialize a type
E) Define and instantiate a type that fufills the Handler interface