diff --git a/includes/logging.php b/includes/logging.php
index 4de09ff..ed732e8 100644
--- a/includes/logging.php
+++ b/includes/logging.php
@@ -60,7 +60,7 @@ function logging($level, $message) {
       $_SERVER['REMOTE_ADDR'],
     );
     if (isset($auth_user))
-      $msg[] = ($auth_user?$auth_user:'anonymous');
+      $msg[] = ($auth_user['username']?$auth_user['username']:'anonymous');
     $msg[] = $level;
     $msg[] = $message;
     $msg = implode(' - ', $msg)."\n";
diff --git a/includes/url.php b/includes/url.php
index 1168c16..4b4a520 100644
--- a/includes/url.php
+++ b/includes/url.php
@@ -29,14 +29,20 @@ $url_patterns =array();
  * @param $pattern        string        The URL pattern (required)
  * @param $handler        callable      The URL pattern handler (must be callable, required)
  * @param $authenticated  boolean       Permit to define if this URL is accessible only for
- *                                      authenticated users (optional, default: true)
+ *                                      authenticated users (optional, default: true if the special
+ *                                      force_authentication function is defined, false otherwise)
  * @param $override       boolean       Allow override if a command already exists with the
  *                                      same name (optional, default: false)
  * @param $api_mode       boolean       Enable API mode (optional, default: false)
  * @param $methods        array|null    HTTP method (optional, default: array('GET', 'POST'))
  **/
-function add_url_handler($pattern, $handler=null, $authenticated=false, $override=true,
+function add_url_handler($pattern, $handler=null, $authenticated=null, $override=true,
                          $api_mode=false, $methods=null) {
+  $authenticated = (
+    is_null($authenticated)?
+    function_exists('force_authentication'):
+    (bool)$authenticated
+  );
   if (is_null($methods))
     $methods = array('GET', 'POST');
   elseif (!is_array($methods))
@@ -322,6 +328,10 @@ function redirect($go=false) {
 /**
  * Handle the current requested URL
  *
+ * Note: if the route required that user is authenticated, this method will
+ * invoke the force_authentication() special function (or trigger a fatal error
+ * if it's not defined).
+ *
  * @param $default_url string|null The default URL if current one does not
  *                                 match with any configured pattern.
  *
@@ -343,8 +353,11 @@ function handle_request($default_url=null) {
     $smarty -> assign('request', $request);
 
   // Check authentication (if need)
-  if($request -> authenticated && function_exists('force_authentication'))
-    force_authentication();
+  if($request -> authenticated)
+    if (function_exists('force_authentication'))
+      force_authentication();
+    else
+      logging('FATAL', _("Authentication required but force_authentication function is not defined."));
 
   try {
     return call_user_func($request -> handler, $request);
diff --git a/lang/fr_FR.UTF8/LC_MESSAGES/DEFAULT.mo b/lang/fr_FR.UTF8/LC_MESSAGES/DEFAULT.mo
index 8a923e5..0c676c8 100644
Binary files a/lang/fr_FR.UTF8/LC_MESSAGES/DEFAULT.mo and b/lang/fr_FR.UTF8/LC_MESSAGES/DEFAULT.mo differ
diff --git a/lang/fr_FR.UTF8/LC_MESSAGES/DEFAULT.po b/lang/fr_FR.UTF8/LC_MESSAGES/DEFAULT.po
index 5b9e7e2..ad867fb 100644
--- a/lang/fr_FR.UTF8/LC_MESSAGES/DEFAULT.po
+++ b/lang/fr_FR.UTF8/LC_MESSAGES/DEFAULT.po
@@ -1,7 +1,7 @@
 msgid ""
 msgstr ""
 "Project-Id-Version: \n"
-"POT-Creation-Date: 2022-04-24 19:09+0200\n"
+"POT-Creation-Date: 2022-04-25 18:40+0200\n"
 "PO-Revision-Date: \n"
 "Last-Translator: Benjamin Renard <brenard@easter-eggs.com>\n"
 "Language-Team: \n"
@@ -351,27 +351,27 @@ msgstr ""
 "\n"
 "Mail originalement destiné à %s."
 
-#: /home/brenard/dev/eesyphp/includes/url.php:92
+#: /home/brenard/dev/eesyphp/includes/url.php:98
 msgid "Bad request"
 msgstr "Mauvaise requête"
 
-#: /home/brenard/dev/eesyphp/includes/url.php:93
+#: /home/brenard/dev/eesyphp/includes/url.php:99
 msgid "Invalid request."
 msgstr "Requête invalide."
 
-#: /home/brenard/dev/eesyphp/includes/url.php:96
+#: /home/brenard/dev/eesyphp/includes/url.php:102
 msgid "Authentication required"
 msgstr "Authentification requise"
 
-#: /home/brenard/dev/eesyphp/includes/url.php:97
+#: /home/brenard/dev/eesyphp/includes/url.php:103
 msgid "You have to be authenticated to access to this page."
 msgstr "Vous devez être authentifié pour accéder à cette page."
 
-#: /home/brenard/dev/eesyphp/includes/url.php:100
+#: /home/brenard/dev/eesyphp/includes/url.php:106
 msgid "Access denied"
 msgstr "Accès interdit"
 
-#: /home/brenard/dev/eesyphp/includes/url.php:101
+#: /home/brenard/dev/eesyphp/includes/url.php:107
 msgid ""
 "You do not have access to this application. If you think this is an error, "
 "please contact support."
@@ -379,25 +379,25 @@ msgstr ""
 "Vous n'avez pas accès à cette application. Si vous pensez qu'il s'agit d'une "
 "erreur, merci de prendre contact avec le support."
 
-#: /home/brenard/dev/eesyphp/includes/url.php:104
+#: /home/brenard/dev/eesyphp/includes/url.php:110
 msgid "Whoops ! Page not found"
 msgstr "Oups ! Page introuvable"
 
-#: /home/brenard/dev/eesyphp/includes/url.php:105
+#: /home/brenard/dev/eesyphp/includes/url.php:111
 msgid "The requested page can not be found."
 msgstr "La page demandée est introuvable."
 
-#: /home/brenard/dev/eesyphp/includes/url.php:113
+#: /home/brenard/dev/eesyphp/includes/url.php:119
 msgid "Error"
 msgstr "Erreur"
 
-#: /home/brenard/dev/eesyphp/includes/url.php:114
+#: /home/brenard/dev/eesyphp/includes/url.php:120
 msgid "An unknown error occurred. If problem persist, please contact support."
 msgstr ""
 "Une erreur inconnue est survenue. Si le problème persiste, merci de prendre "
 "contact avec le support."
 
-#: /home/brenard/dev/eesyphp/includes/url.php:159
+#: /home/brenard/dev/eesyphp/includes/url.php:165
 msgid ""
 "Unable to determine the requested page. If the problem persists, please "
 "contact support."
@@ -405,7 +405,7 @@ msgstr ""
 "Impossible de déterminer la page demandée. Si le problème persiste, merci de "
 "prendre contact avec le support."
 
-#: /home/brenard/dev/eesyphp/includes/url.php:312
+#: /home/brenard/dev/eesyphp/includes/url.php:318
 msgid ""
 "Unable to determine the requested page (loop detected). If the problem "
 "persists, please contact support."
@@ -413,11 +413,18 @@ msgstr ""
 "Impossible de déterminer la page demandée (boucle détectée). Si le problème "
 "persiste, merci de prendre contact avec le support."
 
-#: /home/brenard/dev/eesyphp/includes/url.php:337
+#: /home/brenard/dev/eesyphp/includes/url.php:347
 msgid "This request cannot be processed."
 msgstr "Cette requête ne peut être traitée."
 
-#: /home/brenard/dev/eesyphp/includes/url.php:355
+#: /home/brenard/dev/eesyphp/includes/url.php:360
+msgid ""
+"Authentication required but force_authentication function is not defined."
+msgstr ""
+"Authentification requise mais la fonction force_authentication n'est pas "
+"définie."
+
+#: /home/brenard/dev/eesyphp/includes/url.php:368
 msgid "This request could not be processed correctly."
 msgstr "Cette requête n'a put être traitée correctement."
 
diff --git a/lang/headers.pot b/lang/headers.pot
index 4328979..ede26b1 100644
--- a/lang/headers.pot
+++ b/lang/headers.pot
@@ -1,7 +1,7 @@
 msgid ""
 msgstr ""
-"POT-Creation-Date: 2022-04-24 20:13+0200\n"
-"PO-Revision-Date: 2022-04-24 20:13+0200\n"
+"POT-Creation-Date: 2022-04-25 18:40+0200\n"
+"PO-Revision-Date: 2022-04-25 18:40+0200\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=utf-8\n"
 "Content-Transfer-Encoding: 8bit\n"
\ No newline at end of file
diff --git a/lang/messages.pot b/lang/messages.pot
index 812b08e..76660ee 100644
--- a/lang/messages.pot
+++ b/lang/messages.pot
@@ -1,7 +1,7 @@
 msgid ""
 msgstr ""
-"POT-Creation-Date: 2022-04-24 20:13+0200\n"
-"PO-Revision-Date: 2022-04-24 20:13+0200\n"
+"POT-Creation-Date: 2022-04-25 18:40+0200\n"
+"PO-Revision-Date: 2022-04-25 18:40+0200\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
@@ -305,65 +305,70 @@ msgid ""
 "Mail initialy intended for %s."
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:92
+#: /home/brenard/dev/eesyphp/includes/url.php:98
 msgid "Bad request"
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:93
+#: /home/brenard/dev/eesyphp/includes/url.php:99
 msgid "Invalid request."
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:96
+#: /home/brenard/dev/eesyphp/includes/url.php:102
 msgid "Authentication required"
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:97
+#: /home/brenard/dev/eesyphp/includes/url.php:103
 msgid "You have to be authenticated to access to this page."
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:100
+#: /home/brenard/dev/eesyphp/includes/url.php:106
 msgid "Access denied"
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:101
+#: /home/brenard/dev/eesyphp/includes/url.php:107
 msgid ""
 "You do not have access to this application. If you think this is an error, "
 "please contact support."
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:104
+#: /home/brenard/dev/eesyphp/includes/url.php:110
 msgid "Whoops ! Page not found"
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:105
+#: /home/brenard/dev/eesyphp/includes/url.php:111
 msgid "The requested page can not be found."
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:113
+#: /home/brenard/dev/eesyphp/includes/url.php:119
 msgid "Error"
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:114
+#: /home/brenard/dev/eesyphp/includes/url.php:120
 msgid "An unknown error occurred. If problem persist, please contact support."
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:159
+#: /home/brenard/dev/eesyphp/includes/url.php:165
 msgid ""
 "Unable to determine the requested page. If the problem persists, please "
 "contact support."
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:312
+#: /home/brenard/dev/eesyphp/includes/url.php:318
 msgid ""
 "Unable to determine the requested page (loop detected). If the problem "
 "persists, please contact support."
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:337
+#: /home/brenard/dev/eesyphp/includes/url.php:347
 msgid "This request cannot be processed."
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:355
+#: /home/brenard/dev/eesyphp/includes/url.php:360
+msgid ""
+"Authentication required but force_authentication function is not defined."
+msgstr ""
+
+#: /home/brenard/dev/eesyphp/includes/url.php:368
 msgid "This request could not be processed correctly."
 msgstr ""
 
diff --git a/lang/php-messages.pot b/lang/php-messages.pot
index 87b7471..8615dc5 100644
--- a/lang/php-messages.pot
+++ b/lang/php-messages.pot
@@ -297,65 +297,70 @@ msgid ""
 "Mail initialy intended for %s."
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:92
+#: /home/brenard/dev/eesyphp/includes/url.php:98
 msgid "Bad request"
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:93
+#: /home/brenard/dev/eesyphp/includes/url.php:99
 msgid "Invalid request."
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:96
+#: /home/brenard/dev/eesyphp/includes/url.php:102
 msgid "Authentication required"
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:97
+#: /home/brenard/dev/eesyphp/includes/url.php:103
 msgid "You have to be authenticated to access to this page."
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:100
+#: /home/brenard/dev/eesyphp/includes/url.php:106
 msgid "Access denied"
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:101
+#: /home/brenard/dev/eesyphp/includes/url.php:107
 msgid ""
 "You do not have access to this application. If you think this is an error, "
 "please contact support."
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:104
+#: /home/brenard/dev/eesyphp/includes/url.php:110
 msgid "Whoops ! Page not found"
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:105
+#: /home/brenard/dev/eesyphp/includes/url.php:111
 msgid "The requested page can not be found."
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:113
+#: /home/brenard/dev/eesyphp/includes/url.php:119
 msgid "Error"
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:114
+#: /home/brenard/dev/eesyphp/includes/url.php:120
 msgid "An unknown error occurred. If problem persist, please contact support."
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:159
+#: /home/brenard/dev/eesyphp/includes/url.php:165
 msgid ""
 "Unable to determine the requested page. If the problem persists, please "
 "contact support."
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:312
+#: /home/brenard/dev/eesyphp/includes/url.php:318
 msgid ""
 "Unable to determine the requested page (loop detected). If the problem "
 "persists, please contact support."
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:337
+#: /home/brenard/dev/eesyphp/includes/url.php:347
 msgid "This request cannot be processed."
 msgstr ""
 
-#: /home/brenard/dev/eesyphp/includes/url.php:355
+#: /home/brenard/dev/eesyphp/includes/url.php:360
+msgid ""
+"Authentication required but force_authentication function is not defined."
+msgstr ""
+
+#: /home/brenard/dev/eesyphp/includes/url.php:368
 msgid "This request could not be processed correctly."
 msgstr ""