diff --git a/fn/common.php b/fn/common.php
index 46002fc..7d94f68 100644
--- a/fn/common.php
+++ b/fn/common.php
@@ -1,27 +1,33 @@
 <?php
 
+$final_message = null;
+
 function success($msg = '') {
+	global $final_message;
 	if ($msg !== '')
-		echo "<p><output><strong>Succès</strong> : <em>" . $msg . "</em></output></p>\n";
-	closeHTML();
+		$final_message = "<p><output><strong>Succès</strong> : <em>" . $msg . "</em></output></p>\n";
 }
 
 // When the user requests something unexpected
 function userError($msg) {
+	global $final_message;
+	$final_message = "<p><output><strong>Erreur utilisataire</strong> : <em>" . $msg . "</em></output></p>\n";
 	http_response_code(403);
-	echo "<p><output><strong>Erreur utilisataire</strong> : <em>" . $msg . "</em></output></p>\n";
-	closeHTML();
+	executePage();
 }
 
 // When the system did something unexpected
 function serverError($msg) {
+	global $final_message;
+	$final_message = "<p><output><strong>Server error</strong>: The server encountered an error: <em>" . $msg . "</em></output></p>\n";
 	http_response_code(500);
 	error_log("Niver internal error: " . strip_tags($msg));
-	echo "<p><output><strong>Server error</strong>: The server encountered an error: <em>" . $msg . "</em></output></p>\n";
-	closeHTML();
+	executePage();
 }
 
 function processForm($requireLogin = true) {
+	if (http_response_code() !== 200)
+		return false;
 	if (empty($_POST) AND $requireLogin AND !isset($_SESSION['username']))
 		echo '<p>Ce formulaire ne sera pas accepté car il faut <a class="auth" href="' . redirUrl('auth/login') . '">se connecter</a> avant.</p>';
 	if (empty($_POST))
diff --git a/html.php b/html.php
index 647e1d4..b52a359 100644
--- a/html.php
+++ b/html.php
@@ -71,6 +71,9 @@ if (empty($_POST) === false AND (isset($_SERVER['HTTP_SEC_FETCH_SITE']) !== true
 	userError("Anti-<abbr title='Cross-Site Request Forgery'>CSRF</abbr> verification failed ! (Wrong or unset <code>Sec-Fetch-Site</code> HTTP header)");
 
 function closeHTML() {
+	global $final_message;
+	if (isset($final_message))
+		echo $final_message;
 ?>
 		</main>
 	</body>
diff --git a/router.php b/router.php
index e468708..231dbc2 100644
--- a/router.php
+++ b/router.php
@@ -44,6 +44,8 @@ if (SERVICE !== '.') {
 
 require "html.php";
 
-require "pages/" . PAGE_ADDRESS . ".php";
-
-closeHtml();
+function executePage() {
+	require "pages/" . PAGE_ADDRESS . ".php";
+	closeHtml();
+}
+executePage();