routes.py : custom on_error routes for invalid request

server/web2py/routes.py

 default_application='vidjil'
 default_controller = "default"
 default_function = "index"
+
+routes_onerror = [
+  ('*/400','/vidjil/static/404.html'),
+  ('*/404','/vidjil/static/404.html'),
+  ('*/415','/vidjil/static/404.html'),
+  ('*/422','/vidjil/static/404.html'),
+  ('*/502','/vidjil/static/404.html')
+]