diff --git a/action/ajax.php b/action/ajax.php
index 8eca95b..f038557 100644
--- a/action/ajax.php
+++ b/action/ajax.php
@@ -470,7 +470,7 @@ private function __get_siteexport_list_and_init_tocs($NS, $isRedirected = false)
      * Add page with ID to the package
      **/
     private function __siteexport_add_site($ID) {
-        global $conf, $CURRENT_ID, $CURRENT_PARENT;
+        global $conf, $CURRENT_ID, $CURRENT_PARENT, $INPUT;
 
         // Which is the current ID?
         $CURRENT_ID = $ID;
@@ -486,17 +486,17 @@ private function __siteexport_add_site($ID) {
         // say, what to export and Build URL
         // http://documentation:81/helpdesk/de/hds/getting-started?depthType=0&do=siteexport&ens=helpdesk%3Ade%3Ahds%3Agetting-started&pdfExport=1&renderer=siteexport_siteexportpdf&template=helpdesk
         
-        $do = (intval($_REQUEST['exportbody'] ?? 0) == 1 ? (empty($_REQUEST['renderer'] ?? '') ? $conf['renderer_xhtml'] : $_REQUEST['renderer']) : '');
+        $do = $INPUT->int('exportbody', 0, true) == 1 ? $INPUT->str('renderer', $conf['renderer_xhtml'], true) : '';
         
         if ($do == 'pdf' && $this->filewriter->canDoPDF())
         {
             $do = 'export_siteexport_pdf';
-            $_REQUEST['origRenderer'] = (empty($_REQUEST['renderer']) ? $conf['renderer_xhtml'] : $_REQUEST['renderer']);
-        } else if ( ($_REQUEST['renderer'] ?? '') == 'dw2pdf') {
+            $INPUT->set('origRenderer', $INPUT->str('renderer', $conf['renderer_xhtml'], true));
+        } else if ($INPUT->str('renderer') == 'dw2pdf') {
             $do = 'pdf';
         }
         
-        $do = ($do == $conf['renderer_xhtml'] && intval($_REQUEST['exportbody']) != 1) ? '' : 'export_' . $do;
+        $do = ($do == $conf['renderer_xhtml'] && $INPUT->int('exportbody', 0, true) != 1) ? '' : 'export_' . $do;
 
         if ($do != 'export_' && !empty($do) )
         {
@@ -504,8 +504,8 @@ private function __siteexport_add_site($ID) {
         }
 
         // set Template
-        if (!empty($_REQUEST['template'])) {
-            $request['template'] = $_REQUEST['template'];
+        if (!empty($INPUT->str('template'))) {
+            $request['template'] = $INPUT->str('template');
         }
 
         $this->functions->debug->message("REQUEST for add_site:", $request, 2);
@@ -1040,6 +1040,8 @@ private function __fetchAndReplaceLinkFinish( $DATA, $url, $noDeepReplace, $newA
             $this->functions->debug->message("Final Link after empty file from '$url'", null, 2);
 
             return $link;
+        } elseif ($tmpFile === true) {
+            return "file_not_found_and_ignored.html";
         }
 
         $this->functions->debug->message("The fetched file looks good.", $tmpFile, 2);
@@ -1233,13 +1235,16 @@ private function __getInternalRewriteURL($url) {
      **/
     private function __getParamsAndDataRewritten(&$DATA, &$PARAMS, $IDKEY = 'id') {
 
+        if (empty($PARAMS))
+            return array();
+
         $PARRAY = explode('&', str_replace('&', '&', $PARAMS));
         $PARAMS = array();
 
         foreach ($PARRAY as $item) {
-            list($key, $value) = explode('=', $item, 2);
+            list($key, $value) = array_pad( explode('=', $item, 2), 2, null );
             if (empty($key) || empty($value))
-            continue;
+                continue;
 
             if (strtolower(trim($key)) == $IDKEY) {
                 $DATA[2] = preg_replace("%^" . preg_quote(DOKU_BASE, '%') . "%", "", str_replace(':', '/', $value));
diff --git a/helper.php b/helper.php
index a032ad6..c393864 100644
--- a/helper.php
+++ b/helper.php
@@ -143,7 +143,7 @@ public function __getOrderedListOfPagesForStartEnd($ID, $start, $end)
 
     public function __siteexport_addpage() {
         
-        global $ID, $conf;
+        global $ID, $conf, $INPUT;
 
         $templateSwitching = false;
         $pdfExport = false;
@@ -177,10 +177,10 @@ public function __siteexport_addpage() {
         $form->addElement(form_makeTextField('ens', $ID, $this->getLang('ens') . ':', 'ens'));
 
         $form->addElement(form_makeTag('br'));
-        $form->addElement(form_makeListboxField('depthType', array("0.0" => $this->getLang('depth.pageOnly'), "1.0" => $this->getLang('depth.allSubNameSpaces'), "2.0" => $this->getLang('depth.specifiedDepth')), (empty($_REQUEST['depthType']) ? $this->getLang('depth.allSubNameSpaces') : $_REQUEST['depthType']), $this->getLang('depthType') . ':', 'depthType', null, array_merge(array('class' => 'edit'))));
+        $form->addElement(form_makeListboxField('depthType', array("0.0" => $this->getLang('depth.pageOnly'), "1.0" => $this->getLang('depth.allSubNameSpaces'), "2.0" => $this->getLang('depth.specifiedDepth')), $INPUT->str('depthType', $this->getLang('depth.allSubNameSpaces'), true), $this->getLang('depthType') . ':', 'depthType', null, array_merge(array('class' => 'edit'))));
 
         $form->addElement(form_makeTag('br'));
-        $form->addElement(form_makeOpenTag("div", array('style' => 'display:' . ($_REQUEST['depthType'] == "2" ? "block" : "none") . ';', 'id' => 'depthContainer')));
+        $form->addElement(form_makeOpenTag("div", array('style' => 'display:' . ($INPUT->str('depthType') == "2" ? "block" : "none") . ';', 'id' => 'depthContainer')));
         $form->addElement(form_makeTextField('depth', $this->getConf('depth'), $this->getLang('depth') . ':', 'depth'));
         $form->addElement(form_makeCloseTag("div"));
 
diff --git a/inc/functions.php b/inc/functions.php
index a68a224..599b835 100644
--- a/inc/functions.php
+++ b/inc/functions.php
@@ -440,6 +440,9 @@ public function parseStringToRequestArray($inputArray, $decode=false)
         $outputArray = $inputArray;
         if ( !is_array($inputArray) )
         {
+            if (empty($inputArray))
+                return array();
+
             $intermediate = str_replace("&", "&", $inputArray);
 
             $outputArray = array();
@@ -677,7 +680,9 @@ public function getRelativeURL($replaceURL, $baseURL, $existingPageID = null)
         $isExternalPage = count($baseParts) == $originalBasePartsCount;
 
         // the new page is in the same plugin, with a different subcontext and same language
-        $isExternalPage = $isExternalPage || ($didKickSomeParts == 1 && $baseParts[0] != $replaceParts[0] && $baseParts[1] == $replaceParts[1] );
+        $parts0equal = (isset($baseParts[0]) && isset($replaceParts[0]) && $baseParts[0] == $replaceParts[0]);
+        $parts1equal = (isset($baseParts[1]) && isset($replaceParts[1]) && $baseParts[1] == $replaceParts[1]);
+        $isExternalPage = $isExternalPage || ($didKickSomeParts == 1 && !$parts0equal && $parts1equal);
 
         // find out if this is outside of our own export context, beyond the baseURL
         $offsiteTemplate = $this->getConf("offSiteLinkTemplate");
diff --git a/inc/httpproxy.php b/inc/httpproxy.php
index a6912a9..1601187 100644
--- a/inc/httpproxy.php
+++ b/inc/httpproxy.php
@@ -35,7 +35,7 @@ class HTTPProxy extends _HTTPProxy {
      * @param siteexport_functions $functions
      */
     public function __construct($functions) {
-        global $conf;
+        global $conf, $INPUT;
 
         // The proxy should only be used if configured.
         // Usually the proxy will allow connections away from the current server.
@@ -74,9 +74,9 @@ public function __construct($functions) {
 
         $this->headers['X-Real-Ip'] = clientIP(true);
         $this->headers['X-Site-Exporter'] = $functions->getSecurityToken();
-        $this->headers['Accept-Encoding'] = $_SERVER['HTTP_ACCEPT_ENCODING'] ?? '';
-        $this->headers['Accept-Charset'] = $_SERVER['HTTP_ACCEPT_CHARSET'] ?? '';
-        $this->agent = $_SERVER['HTTP_USER_AGENT'] . ' DokuWiki/SiteExport';
+        $this->headers['Accept-Encoding'] = $INPUT->server->str('HTTP_ACCEPT_ENCODING');
+        $this->headers['Accept-Charset'] = $INPUT->server->str('HTTP_ACCEPT_CHARSET');
+        $this->agent = $INPUT->server->str('HTTP_USER_AGENT') . ' DokuWiki/SiteExport';
     }
 
     /**
diff --git a/inc/settings.php b/inc/settings.php
index 649543a..33c5ba6 100644
--- a/inc/settings.php
+++ b/inc/settings.php
@@ -98,7 +98,7 @@ public function __construct($functions) {
         $ens = $INPUT->str( 'ens' );
         $this->exportNamespace = !empty($ens) && preg_match("%^" . preg_quote($functions->getNamespaceFromID($ens, $pg), '%') . "%", $this->namespace) ? $functions->getNamespaceFromID($ens, $pg) : $this->namespace;
 
-        $this->TOCMapWithoutTranslation = intval($_REQUEST['TOCMapWithoutTranslation'] ?? 0) == 1 ? true : false;
+        $this->TOCMapWithoutTranslation = ($INPUT->int('TOCMapWithoutTranslation', 0, true) == 1);
 
         $this->defaultLang = $INPUT->str( 'defaultLang', $conf['lang'], true );
 
diff --git a/preload.php b/preload.php
index 7bea291..d018b0e 100644
--- a/preload.php
+++ b/preload.php
@@ -176,13 +176,15 @@ class preload_plugin_siteexport_controller extends _preload_plugin_siteexport_co
      * Setup disabling
      */
     public function __construct() {
+        global $INPUT;
+
         parent::__construct();
 
         $disabledPlugins = array();
 
         // support of old syntax
-        if (is_array($_REQUEST['diPlu'] ?? null)) {
-            $disabledPlugins = $_REQUEST['diPlu'];
+        if (is_array($INPUT->arr('diPlu'))) {
+            $disabledPlugins = $INPUT->arr('diPlu');
         }
 
         if (!empty($_REQUEST['diInv']))
@@ -193,11 +195,11 @@ public function __construct() {
                 if ($enabled == 1 && !file_exists(DOKU_PLUGIN . "$plugin/script.js") && !file_exists(DOKU_PLUGIN . "$plugin/style.css") && !file_exists(DOKU_PLUGIN . "$plugin/print.css")) { continue; }
                 $allPlugins[] = $plugin;
             }
-            $disabledPlugins = empty($_REQUEST['diPlu']) ? $allPlugins : array_diff($allPlugins, $_REQUEST['diPlu']);
+            $disabledPlugins = empty($INPUT->arr('diPlu')) ? $allPlugins : array_diff($allPlugins, $INPUT->arr('diPlu'));
         }
 
         // if this is defined, it overrides the settings made above. obviously.
-        $disabledPlugins = empty($_REQUEST['disableplugin']) ? $disabledPlugins : $_REQUEST['disableplugin'];
+        $disabledPlugins = $INPUT->arr('disableplugin', $disabledPlugins, true);
 
         foreach ($disabledPlugins as $plugin) {
             $this->disable($plugin);