diff --git a/Classes/Eid/SruEid.php b/Classes/Eid/SruEid.php
deleted file mode 100644
index ef7808bda..000000000
--- a/Classes/Eid/SruEid.php
+++ /dev/null
@@ -1,156 +0,0 @@
-<?php
-
-namespace Slub\Dfgviewer\Eid;
-
-/***************************************************************
- *  Copyright notice
- *
- *  (c) 2014 Alexander Bigga <typo3@slub-dresden.de>
- *  All rights reserved
- *
- *  This script is part of the TYPO3 project. The TYPO3 project 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.
- *
- *  The GNU General Public License can be found at
- *  http://www.gnu.org/copyleft/gpl.html.
- *
- *  This script 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.
- *
- *  This copyright notice MUST APPEAR in all copies of the script!
- ***************************************************************/
-
-use Psr\Http\Message\ResponseInterface;
-use Psr\Http\Message\ServerRequestInterface;
-use TYPO3\CMS\Core\Http\Response;
-use TYPO3\CMS\Core\Utility\GeneralUtility;
-
-/**
- * Plugin 'DFG-Viewer: SRU Client eID script' for the 'dfgviewer' extension.
- *
- * @author    Alexander Bigga <typo3@slub-dresden.de>
- * @copyright    Copyright (c) 2014, Alexander Bigga, SLUB Dresden
- * @package    TYPO3
- * @subpackage    tx_dfgviewer
- * @access    public
- */
-class SruEid
-{
-
-    /**
-     * The main method of the eID script
-     *
-     * @access public
-     *
-     * @param ServerRequestInterface $request
-     * @return ResponseInterface
-     */
-    public function main(ServerRequestInterface $request)
-    {
-        // parameters are sent by POST --> use getParsedBody() instead of getQueryParams()
-        $parameters = $request->getParsedBody();
-        $sru = (string)$parameters['sru'];
-        $query = (string)$parameters['q'];
-
-        $url = $sru . '?operation=searchRetrieve&version=1.2&startRecord=1&maximumRecords=10&recordSchema=dfg-viewer/page&query=' . urlencode($query);
-
-        // make request to SRU service
-        $sruXML = simplexml_load_file($url);
-
-        $results = [];
-
-        if ($sruXML !== FALSE) {
-            // the result may be a valid <srw:searchRetrieveResponse> or some HTML code
-            $sruResponse = $sruXML->xpath('/srw:searchRetrieveResponse');
-
-            if ($sruResponse === FALSE) {
-                $results['error'] = '';
-            } else {
-                $sruRecords = $sruXML->xpath('/srw:searchRetrieveResponse/srw:records/srw:record');
-                if ($sruRecords === FALSE || empty($sruRecords)) {
-                    $results['error'] = '';
-                }
-
-                foreach ($sruRecords as $id => $record) {
-                    $fullTextHit = $record->xpath('//srw:recordData');
-                    $pageAttributes = [];
-                    foreach ($fullTextHit[$id]->children('http://dfg-viewer.de/')->page->attributes() as $key => $val) {
-                        $pageAttributes[$key] = $val;
-                    }
-
-                    $hitFound = [];
-                    // there may be multiple hits on a page per search query
-                    foreach ($fullTextHit[$id]->children('http://dfg-viewer.de/')->page->fulltexthit as $hit) {
-                        $hitAttributes = [];
-                        foreach ($hit->attributes() as $key => $val) {
-                            $hitAttributes[$key] = $val;
-                        }
-
-                        $hitFound[] = array('text' => $hit->span, 'attributes' => $hitAttributes);
-                    }
-
-                    $page = (string)$pageAttributes['id'];
-
-                    // get METS file of search hit
-                    $parentUrl = (string)$fullTextHit[$id]->children('http://dfg-viewer.de/')->page->parent->attributes()->url;
-
-                    // unset $hightlightParams but make sure, it's an array()
-                    $highlightParams = [];
-
-                    // get highlight boxes for all results of a page
-                    foreach ($hitFound as $key => $hit) {
-                        $highlightField = $hit['attributes']['x1'] . ',' . $hit['attributes']['y1'] . ',' . $hit['attributes']['x2'] . ',' . $hit['attributes']['y2'];
-                        if (!in_array($highlightField, $highlightParams)) {
-                            $highlightParams[] = $highlightField;
-                        }
-                    }
-
-                    foreach ($hitFound as $key => $hit) {
-                        $spanPreview = '';
-                        $spanText = '';
-                        if (!empty($hit['attributes']['preview'])) {
-                            $spanPreview = '<span class="sru-preview"><img src="' . $hit['attributes']['preview'] . '"></span>';
-                        }
-
-                        if (is_object($hit['text'])) {
-                            $spanText = '<span class="sru-textsnippet">';
-                            foreach ($hit['text'] as $key => $text) {
-                                if ($text->attributes()->class[0] == 'highlight') {
-                                    $spanText .= '<span class="highlight">' . $text . '</span>';
-                                } else {
-                                    $spanText .= $text;
-                                }
-                            }
-                            $spanText .= '</span>';
-                        }
-
-                        $origImageParams = '0,' . $pageAttributes['width'] . ',' . $pageAttributes ['height'];
-
-                        unset($data);
-
-                        $data['link'] = $parentUrl;
-                        $data['page'] = $page;
-                        $data['text'] = $spanText;
-                        $data['previewImage'] = $spanPreview;
-                        $data['previewText'] = $spanText;
-                        $data['origImage'] = $origImageParams;
-                        $data['highlight'] = urlencode(serialize($highlightParams));
-
-                        $results[] = $data;
-                    }
-                }
-            }
-        }
-
-        // create response object
-        /** @var Response $response */
-        $response = GeneralUtility::makeInstance(Response::class);
-        $response->getBody()->write(json_encode($results));
-        return $response;
-    }
-}
diff --git a/Classes/Middleware/SruMiddleware.php b/Classes/Middleware/SruMiddleware.php
new file mode 100644
index 000000000..1f20dc861
--- /dev/null
+++ b/Classes/Middleware/SruMiddleware.php
@@ -0,0 +1,182 @@
+<?php
+
+namespace Slub\Dfgviewer\Middleware;
+
+/***************************************************************
+ *  Copyright notice
+ *
+ *  (c) 2014 Alexander Bigga <typo3@slub-dresden.de>
+ *  (c) 2023 Beatrycze Volk <typo3@slub-dresden.de>
+ *  All rights reserved
+ *
+ *  This script is part of the TYPO3 project. The TYPO3 project 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.
+ *
+ *  The GNU General Public License can be found at
+ *  http://www.gnu.org/copyleft/gpl.html.
+ *
+ *  This script 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.
+ *
+ *  This copyright notice MUST APPEAR in all copies of the script!
+ ***************************************************************/
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\MiddlewareInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use TYPO3\CMS\Core\Http\Response;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+
+/**
+ * Plugin 'DFG-Viewer: SRU Client Middleware for the 'dfgviewer' extension.
+ *
+ * @package TYPO3
+ * @subpackage tx_dfgviewer
+ * @access public
+ */
+class SruMiddleware implements MiddlewareInterface
+{
+
+    /**
+     * The main method of the middleware.
+     *
+     * @access public
+     *
+     * @param ServerRequestInterface $request
+     * @param RequestHandlerInterface $handler
+     *
+     * @return ResponseInterface
+     */
+    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler) : ResponseInterface
+    {
+        $response = $handler->handle($request);
+        // parameters are sent by POST --> use getParsedBody() instead of getQueryParams()
+        $parameters = $request->getParsedBody();
+        // Return if not this middleware
+        if (!isset($parameters['middleware']) || ($parameters['middleware'] != 'dfgviewer/sru')) {
+            return $response;
+        }
+
+        $sru = (string) $parameters['sru'];
+        $query = (string) $parameters['q'];
+
+        $url = $sru . '?operation=searchRetrieve&version=1.2&startRecord=1&maximumRecords=10&recordSchema=dfg-viewer/page&query=' . urlencode($query);
+
+        // make request to SRU service
+        $sruXML = simplexml_load_file($url);
+
+        $results = [];
+
+        if ($sruXML !== FALSE) {
+            // the result may be a valid <srw:searchRetrieveResponse> or some HTML code
+            $sruResponse = $sruXML->xpath('/srw:searchRetrieveResponse');
+
+            if ($sruResponse === FALSE) {
+                $results['error'] = '';
+            } else {
+                $sruRecords = $sruXML->xpath('/srw:searchRetrieveResponse/srw:records/srw:record');
+                if ($sruRecords === FALSE || empty($sruRecords)) {
+                    $results['error'] = '';
+                } else {
+                    $results = $this->getSruRecords($sruRecords);
+                }
+            }
+        }
+
+        // create response object
+        /** @var Response $response */
+        $response = GeneralUtility::makeInstance(Response::class);
+        $response->getBody()->write(json_encode($results));
+        return $response;
+    }
+
+    /**
+     * Gets parsed SRU records.
+     *
+     * @access private
+     *
+     * @param array $sruRecords
+     * 
+     * @return array
+     */
+    private function getSruRecords(array $sruRecords): array {
+        $results = [];
+
+        foreach ($sruRecords as $id => $record) {
+            $fullTextHit = $record->xpath('//srw:recordData');
+            $pageAttributes = [];
+            foreach ($fullTextHit[$id]->children('http://dfg-viewer.de/')->page->attributes() as $key => $val) {
+                $pageAttributes[$key] = $val;
+            }
+
+            $hitFound = [];
+            // there may be multiple hits on a page per search query
+            foreach ($fullTextHit[$id]->children('http://dfg-viewer.de/')->page->fulltexthit as $hit) {
+                $hitAttributes = [];
+                foreach ($hit->attributes() as $key => $val) {
+                    $hitAttributes[$key] = $val;
+                }
+
+                $hitFound[] = array('text' => $hit->span, 'attributes' => $hitAttributes);
+            }
+
+            $page = (string) $pageAttributes['id'];
+
+            // get METS file of search hit
+            $parentUrl = (string) $fullTextHit[$id]->children('http://dfg-viewer.de/')->page->parent->attributes()->url;
+
+            // unset $highlightParams but make sure, it's an array()
+            $highlightParams = [];
+
+            // get highlight boxes for all results of a page
+            foreach ($hitFound as $key => $hit) {
+                $highlightField = $hit['attributes']['x1'] . ',' . $hit['attributes']['y1'] . ',' . $hit['attributes']['x2'] . ',' . $hit['attributes']['y2'];
+                if (!in_array($highlightField, $highlightParams)) {
+                    $highlightParams[] = $highlightField;
+                }
+            }
+
+            foreach ($hitFound as $key => $hit) {
+                $spanPreview = '';
+                $spanText = '';
+                if (!empty($hit['attributes']['preview'])) {
+                    $spanPreview = '<span class="sru-preview"><img src="' . $hit['attributes']['preview'] . '"></span>';
+                }
+
+                if (is_object($hit['text'])) {
+                    $spanText = '<span class="sru-textsnippet">';
+                    foreach ($hit['text'] as $key => $text) {
+                        if ($text->attributes()->class[0] == 'highlight') {
+                            $spanText .= '<span class="highlight">' . $text . '</span>';
+                        } else {
+                            $spanText .= $text;
+                        }
+                    }
+                    $spanText .= '</span>';
+                }
+
+                $origImageParams = '0,' . $pageAttributes['width'] . ',' . $pageAttributes ['height'];
+
+                unset($data);
+
+                $data['link'] = $parentUrl;
+                $data['page'] = $page;
+                $data['text'] = $spanText;
+                $data['previewImage'] = $spanPreview;
+                $data['previewText'] = $spanText;
+                $data['origImage'] = $origImageParams;
+                $data['highlight'] = urlencode(serialize($highlightParams));
+
+                $results[] = $data;
+            }
+        }
+
+        return $results;
+    }
+}
diff --git a/Configuration/RequestMiddlewares.php b/Configuration/RequestMiddlewares.php
new file mode 100644
index 000000000..33f2f8df9
--- /dev/null
+++ b/Configuration/RequestMiddlewares.php
@@ -0,0 +1,35 @@
+<?php
+
+/***************************************************************
+ *  Copyright notice
+ *
+ *  (c) 2023 Beatrycze Volk <typo3@slub-dresden.de>
+ *  All rights reserved
+ *
+ *  This script is part of the TYPO3 project. The TYPO3 project 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.
+ *
+ *  The GNU General Public License can be found at
+ *  http://www.gnu.org/copyleft/gpl.html.
+ *
+ *  This script 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.
+ *
+ *  This copyright notice MUST APPEAR in all copies of the script!
+ ***************************************************************/
+
+return [
+    'frontend' => [
+        'dfgviewer/sru' => [
+            'target' => \Kitodo\Dlf\Middleware\SruMiddleware::class,
+            'after' => [
+                'typo3/cms-frontend/prepare-tsfe-rendering'
+            ]
+        ]
+    ],
+];
diff --git a/Resources/Private/JavaScript/dfgviewerSru.js b/Resources/Private/JavaScript/dfgviewerSru.js
index 61ce15165..cb85d7a66 100644
--- a/Resources/Private/JavaScript/dfgviewerSru.js
+++ b/Resources/Private/JavaScript/dfgviewerSru.js
@@ -35,7 +35,7 @@ $("#tx-dfgviewer-sru-form").submit(function( event ) {
 	$.post(
 		"/",
 		{
-			eID: "tx_dfgviewer_sru_eid",
+			middleware: "dfgviewer/sru",
 			q: $( "input[name='tx_dlf[query]']" ).val(),
 			L: $( "input[name='tx_dfgviewer[L]']" ).val(),
 			id: $( "input[name='tx_dfgviewer[id]']" ).val(),
diff --git a/Resources/Public/JavaScript/allScripts.js b/Resources/Public/JavaScript/allScripts.js
index b68f7a5a2..968c69afe 100644
--- a/Resources/Public/JavaScript/allScripts.js
+++ b/Resources/Public/JavaScript/allScripts.js
@@ -1,6 +1,6 @@
 /*! modernizr 3.5.0 (Custom Build) | MIT *
  * https://modernizr.com/download/?-csstransforms3d-csstransitions-objectfit-touchevents-domprefixes-prefixed-prefixes-setclasses-testallprops-testprop-teststyles !*/
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diff --git a/ext_localconf.php b/ext_localconf.php
index 4d8b1bd40..e7fd0d660 100644
--- a/ext_localconf.php
+++ b/ext_localconf.php
@@ -5,6 +5,7 @@
 *  Copyright notice
 *
 *  (c) 2012 Sebastian Meyer <sebastian.meyer@slub-dresden.de>
+*  (c) 2023 Beatrycze Volk <typo3@slub-dresden.de>
 *  All rights reserved
 *
 *  This script is part of the TYPO3 project. The TYPO3 project is
@@ -24,14 +25,9 @@
 *  This copyright notice MUST APPEAR in all copies of the script!
 ***************************************************************/
 
-use \TYPO3\CMS\Core\Utility\ExtensionManagementUtility;
-
 // Register plugins.
 // ExtensionManagementUtility::addPItoST43('dfgviewer', 'Classes/Plugins/Sru/Sru.php', '_sru', 'list_type', TRUE);
 
-// Register eID handlers.
-$GLOBALS['TYPO3_CONF_VARS']['FE']['eID_include']['tx_dfgviewer_sru_eid'] = \Slub\Dfgviewer\Eid\SruEid::class . '::main';
-
 // Register Extbase plugins
 \TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin(
     'Slub.Dfgviewer',