Index: t3lib/extjs/class.t3lib_extjs_extdirectapi.php
===================================================================
--- t3lib/extjs/class.t3lib_extjs_extdirectapi.php	(Revision 10162)
+++ t3lib/extjs/class.t3lib_extjs_extdirectapi.php	(Arbeitskopie)
@@ -93,6 +93,12 @@
 			$javascriptNamespaces = unserialize($cacheContent);
 		}
 
+			// enable caching
+		$expireDate = date('r', $GLOBALS['EXEC_TIME'] + 3600 * 24 * 30);
+		header('Expires: ' . $expireDate);
+		header('Cache-control: public');
+		header('Pragma:');
+
 			// return the generated javascript API configuration
 		if (count($javascriptNamespaces)) {
 			$setup = '
Index: typo3/classes/class.livesearch.php
===================================================================
--- typo3/classes/class.livesearch.php	(Revision 10162)
+++ typo3/classes/class.livesearch.php	(Arbeitskopie)
@@ -82,7 +82,7 @@
 	 */
 	protected function addJavascriptToBackend() {
 		$pageRenderer = $GLOBALS['TBE_TEMPLATE']->getPageRenderer();
-		$pageRenderer->addJsFile('ajax.php?ajaxID=ExtDirect::getAPI&namespace=TYPO3.LiveSearchActions', 'text/javascript', $compress = FALSE);
+		$pageRenderer->addJsFile('ajax.php?ajaxID=ExtDirect::getAPI&namespace=TYPO3.LiveSearchActions&' . TYPO3_version, 'text/javascript', $compress = FALSE);
 
 		$this->backendReference->addJavascriptFile('js/livesearch.js');
 	}
Index: typo3/template.php
===================================================================
--- typo3/template.php	(Revision 10162)
+++ typo3/template.php	(Arbeitskopie)
@@ -823,7 +823,7 @@
 
 	   if ($this->extDirectStateProvider) {
 			$this->pageRenderer->addJsFile(
-				$this->backPath . 'ajax.php?ajaxID=ExtDirect::getAPI&namespace=TYPO3.ExtDirectStateProvider',
+				$this->backPath . 'ajax.php?ajaxID=ExtDirect::getAPI&namespace=TYPO3.ExtDirectStateProvider&' . TYPO3_version,
 				NULL,
 				FALSE
 			);
@@ -1639,7 +1639,7 @@
 	protected function loadCshJavascript() {
 		$this->pageRenderer->loadExtJS();
 		$this->pageRenderer->addJsFile($this->backPath .'../t3lib/js/extjs/contexthelp.js');
-		$this->pageRenderer->addJsFile($this->backPath . 'ajax.php?ajaxID=ExtDirect::getAPI&namespace=TYPO3.CSH', NULL, FALSE);
+		$this->pageRenderer->addJsFile($this->backPath . 'ajax.php?ajaxID=ExtDirect::getAPI&namespace=TYPO3.CSH&' . TYPO3_version, NULL, FALSE);
 		$this->pageRenderer->addExtDirectCode();
 	}
 
Index: typo3/backend.php
===================================================================
--- typo3/backend.php	(Revision 10162)
+++ typo3/backend.php	(Arbeitskopie)
@@ -249,12 +249,12 @@
 		if (isset($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ExtDirect']) && is_array($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ExtDirect'])) {
 			foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ExtDirect'] as $key => $value) {
 				if (strpos($key, 'TYPO3.Ajax.ExtDirect') !== FALSE) {
-					$this->pageRenderer->addJsFile('ajax.php?ajaxID=ExtDirect::getAPI&namespace=TYPO3.Ajax.ExtDirect', NULL, FALSE);
+					$this->pageRenderer->addJsFile('ajax.php?ajaxID=ExtDirect::getAPI&namespace=TYPO3.Ajax.ExtDirect&' . TYPO3_version, NULL, FALSE);
 					break;
 				}
 			}
 		}
-		$this->pageRenderer->addJsFile('ajax.php?ajaxID=ExtDirect::getAPI&namespace=TYPO3.BackendUserSettings', NULL, FALSE);
+		$this->pageRenderer->addJsFile('ajax.php?ajaxID=ExtDirect::getAPI&namespace=TYPO3.BackendUserSettings&' . TYPO3_version, NULL, FALSE);
 
 		$this->generateJavascript();
 		$this->pageRenderer->addJsInlineCode('BackendInlineJavascript', $this->js);
@@ -349,7 +349,7 @@
 			if (is_array($info['extDirectNamespaces']) && count($info['extDirectNamespaces'])) {
 				foreach ($info['extDirectNamespaces'] as $namespace) {
 					$this->pageRenderer->addJsFile(
-						'ajax.php?ajaxID=ExtDirect::getAPI&namespace=' . $namespace,
+						'ajax.php?ajaxID=ExtDirect::getAPI&namespace=' . $namespace . '&' . TYPO3_version,
 						NULL,
 						FALSE
 					);
Index: typo3/sysext/em/classes/class.tx_em_extensionmanager.php
===================================================================
--- typo3/sysext/em/classes/class.tx_em_extensionmanager.php	(Revision 10162)
+++ typo3/sysext/em/classes/class.tx_em_extensionmanager.php	(Arbeitskopie)
@@ -132,12 +132,12 @@
 
 			// Load  JavaScript:
 		$this->pageRenderer->addJsFile($this->parentObject->doc->backPath .
-			'ajax.php?ajaxID=ExtDirect::getAPI&namespace=TYPO3.EM',
+			'ajax.php?ajaxID=ExtDirect::getAPI&namespace=TYPO3.EM&' . TYPO3_version,
 			NULL,
 			FALSE
 		);
 		$this->pageRenderer->addJsFile($this->parentObject->doc->backPath .
-			'ajax.php?ajaxID=ExtDirect::getAPI&namespace=TYPO3.EMSOAP',
+			'ajax.php?ajaxID=ExtDirect::getAPI&namespace=TYPO3.EMSOAP&' . TYPO3_version,
 			NULL,
 			FALSE
 		);