Just a proposal for Lebtus framework to add use middleware.

Erlang - LebtusMiddlewareProposal.erl

-module(rq_handler).
-compile({parse_transform, leptus_pt}).

%% leptus callbacks
-export([init/3]).
-export([get/3]).
-export([use/3]).
-export([terminate/3]).

init(_Route, _Req, State) ->
    {ok, State}.

%% general middlewares
use(Route, Req, State) ->
	
	%% logger middleware
	Logger = spawn(loggerModule, handlerFunction, []),
	Logger ! {self(), Route, Req, State},

	%% site counter middleware
	Counter = spawn(counterModule, handlerFunction, []),
	Counter ! {self(), Route, Req, State},

	%% etc ...

	ok.

get("/", _Req, State) ->
    {<<"Hello, leptus!">>, State};
get("/hi/:name", Req, State) ->
    Status = 200,
    Name = leptus_req:param(name, Req),
    Body = [{<<"say">>, <<"Hi">>}, {<<"to">>, Name}],
    {Status, {json, Body}, State}.

terminate(_Reason, _Req, _State) ->
    ok.