diff --git a/html/user_login.php b/html/user_login.php
index bd29135c8..cf3c33aae 100644
--- a/html/user_login.php
+++ b/html/user_login.php
@@ -103,27 +103,7 @@ if ( $User->isAdmin()  == 1)
 {
     if (SITE_UPDATE !="") {
         $file=$_ENV['TMP']."/version_noalyss".domaine;
-        if (file_exists($file)) {
-            $date_time=new \DateTime();
-            $file_tmstamp=filemtime($file);
-
-            $delta= $date_time->getTimestamp()  - $file_tmstamp;
-            // 172800 = 2 days in second
-            if ( $delta > 172800 ) {
-                $update=@file_get_contents(SITE_UPDATE);
-                $f_file= fopen($file,"w+");
-                fwrite($f_file,$update);
-                fclose($f_file);
-            } else {
-                $update=@file_get_contents($file);
-            }
-
-        } else {
-            $update=@file_get_contents(SITE_UPDATE);
-            $f_file= fopen($file,"w+");
-            fwrite($f_file,$update);
-            fclose($f_file);
-        }
+        $update=\Noalyss\File_Cache::get_content(SITE_UPDATE,$file,172800);
 
 	 if ($update > $version_noalyss ) {
             echo '<div id="version_div" class="inner_box" style="width:25%;margin-left:10%;margin-top:3px;">';
diff --git a/include/constant.php b/include/constant.php
index f05eb71f9..364bbdd3b 100644
--- a/include/constant.php
+++ b/include/constant.php
@@ -395,13 +395,16 @@ function noalyss_class_autoloader($class)
         "httpinput" => "lib/http_input.class.php",
         "ismallbutton" => "lib/ibutton.class.php",
         "inputswitch" => "lib/input_switch.class.php",
-        "noalyss\mobile" => "class/mobile.class.php",
+        'noalyss\mobile' => "class/mobile.class.php",
         "htmlinput" => "lib/html_input.class.php",
-        "noalyss\dbg"=>"lib/dbg.php",
+        'noalyss\dbg'=>"lib/dbg.php",
+        'noalyss\file_cache'=>"lib/file_cache.class.php",
         "pdfland"=>"class/pdf_land.class.php"
     );
     if (isset ($aClass[$class])) {
         require_once NOALYSS_INCLUDE . "/" . $aClass[$class];
+    }else {
+        echo "autoloader fails with $class";
     }
 
 }
diff --git a/include/lib/file_cache.class.php b/include/lib/file_cache.class.php
new file mode 100644
index 000000000..f09c534bd
--- /dev/null
+++ b/include/lib/file_cache.class.php
@@ -0,0 +1,77 @@
+<?php
+
+/*
+ *   This file is part of noalyss.
+ *
+ *   noalyss is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   noalyss is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with NOALYSS; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+// Copyright Author Dany De Bontridder danydb@aevalys.eu 2002-2024
+
+/*!\file
+ * \brief 
+ */
+/*!
+ *
+ * \class  
+ *
+ * \brief 
+ */
+
+namespace Noalyss;
+
+class File_Cache
+{
+    /**
+     * @brief Check if the file exists, if yes then read otherwise take it from the url,
+     * @param $url url to the file to get the content
+     * @param $filename fullpath to the filename of the cache
+     * @param $time_cache_second valid time, if the cache is older , than reload it from the url
+     * @return void
+     */
+    public static function get_content($url, $filename, $time_cache_second)
+    {
+        $content = null;
+        if (file_exists($filename)) {
+            $date_time = new \DateTime();
+            $file_tmstamp = filemtime($filename);
+
+            $delta = $date_time->getTimestamp() - $file_tmstamp;
+
+            // if file too old , refresh it
+            if ($delta > $time_cache_second) {
+                $content = file_get_contents($url);
+                $f_file = fopen($filename, "w+");
+                if ( $f_file == false ) {
+                    return $content;
+                }
+                fwrite($f_file, $content);
+                fclose($f_file);
+            } else {
+                $content = file_get_contents($filename);
+            }
+        } else {
+            $content = @file_get_contents($url);
+            $f_file = fopen($filename, "w+");
+            if ( $f_file == false ) {
+                return $content;
+            }
+            fwrite($f_file, $content);
+            fclose($f_file);
+
+        }
+        return $content;
+    }
+}
\ No newline at end of file
diff --git a/unit-test/include/lib/file_cacheTest.php b/unit-test/include/lib/file_cacheTest.php
new file mode 100644
index 000000000..41cea8fce
--- /dev/null
+++ b/unit-test/include/lib/file_cacheTest.php
@@ -0,0 +1,68 @@
+<?php
+
+/*
+ * * Copyright (C) 2022 Dany De Bontridder <dany@alchimerys.be>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * 
+ * Author : Dany De Bontridder danydb@noalyss.eu $(DATE)
+ */
+
+/**
+ * @file
+ * @brief noalyss
+ */
+
+use PHPUnit\Framework\TestCase;
+
+require DIRTEST . '/global.php';
+
+/**
+ * @testdox Class Package_RepositoryTest : used for ...
+ * @backupGlobals enabled
+ * @coversDefaultClass
+ */
+class File_CacheTest extends TestCase
+{
+
+    /**
+     * @testdox test the content and cache it
+     * @covers      \Noalyss\File_Cache::get_content
+     */
+    function testGet_content()
+    {
+        $web_xml = $_ENV['TMP'] . "/testcache.xml";
+        if ( file_exists($web_xml) )        unlink($web_xml);
+
+        \Noalyss\File_Cache::get_content(NOALYSS_PACKAGE_REPOSITORY."/web.xml",$web_xml,3);
+
+        $this->assertTrue(file_exists($web_xml),"File not loaded");
+        $time = filemtime($web_xml);
+        sleep(4);
+        clearstatcache(true, $web_xml);
+        \Noalyss\File_Cache::get_content(NOALYSS_PACKAGE_REPOSITORY."/web.xml",$web_xml,30);
+        $time2 = filemtime($web_xml);
+        $this->assertEquals($time, $time2, " testcache.xml not cached");
+
+        \Noalyss\File_Cache::get_content(NOALYSS_PACKAGE_REPOSITORY."/web.xml",$web_xml,3);
+        sleep(6);
+        clearstatcache(true, $web_xml);
+        $time3 = filemtime($web_xml);
+        $this->assertNotEquals($time, $time3, " testcache.xml not refreshed");
+    }
+
+
+}
\ No newline at end of file