diff --git a/halfapi/app.py b/halfapi/app.py
index 0adf6dd..35509bc 100644
--- a/halfapi/app.py
+++ b/halfapi/app.py
@@ -1,50 +1,56 @@
 #!/usr/bin/env python3
+"""
+app.py is the file that is read when launching the application using an asgi
+runner.
+
+It defines the following globals :
+
+    - routes (contains the Route objects for the application)
+    - d_acl (a dictionnary of the active acls for the current project)
+    - d_api (a dictionnary of the routes depending on the routers definition in
+      the project)
+    - application (the asgi application itself - a starlette object)
+
+"""
 # asgi framework
 from starlette.applications import Starlette
 from starlette.authentication import UnauthenticatedUser
 from starlette.middleware import Middleware
-from starlette.responses import Response, JSONResponse
 from starlette.routing import Route
 from starlette.middleware.authentication import AuthenticationMiddleware
 
-# typing
-from typing import Any, Awaitable, Callable, MutableMapping
 
 # module libraries
-from halfapi.conf import HOST, PORT, DB_NAME, SECRET, PRODUCTION, DOMAINS, DOMAINSDICT
+from halfapi.conf import SECRET, PRODUCTION, DOMAINSDICT
 
 from halfapi.lib.jwt_middleware import JWTAuthenticationBackend
 
-from halfapi.lib.responses import *
+from halfapi.lib.responses import (ORJSONResponse, UnauthorizedResponse,
+    NotFoundResponse, InternalServerErrorResponse, NotImplementedResponse)
+
 from halfapi.lib.routes import gen_starlette_routes, api_routes
 from halfapi.lib.schemas import get_api_routes, schema_json, get_acls
 
 
-"""
-Base routes definition
-
-Only debug or doc routes, that should not be available in production
-"""
 routes = [ Route('/', get_api_routes) ]
 
 
 routes += [
     Route('/halfapi/current_user', lambda request, *args, **kwargs:
         ORJSONResponse({'user':request.user.json})
-        if type(request.user) != UnauthenticatedUser
+        if not isinstance(request.user, UnauthenticatedUser)
         else ORJSONResponse({'user': None})),
     Route('/halfapi/schema', schema_json),
     Route('/halfapi/acls', get_acls)
 ]
 
+d_api = {}
+d_acl = {}
+
 for domain, m_domain in DOMAINSDICT.items():
     for route in gen_starlette_routes(m_domain):
         routes.append(route)
 
-
-d_api = {}
-d_acl = {}
-for domain, m_domain in DOMAINSDICT.items():
     d_api[domain], d_acl[domain] = api_routes(m_domain)