Index: typo3/install/index.php
===================================================================
--- typo3/install/index.php	(date 1312309575000)
+++ typo3/install/index.php	(revision )
@@ -121,8 +121,7 @@
 	);
 		// Output the warning message and exit
 	header('Content-Type: text/html; charset=utf-8');
-	header('Cache-Control: no-cache, must-revalidate');
-	header('Pragma: no-cache');
+	t3lib_utility_Http::sendNoCacheHeaders();
 	echo $content;
 	exit();
 }
Index: typo3/sysext/cms/tslib/class.tslib_fe.php
===================================================================
--- typo3/sysext/cms/tslib/class.tslib_fe.php	(date 1312309575000)
+++ typo3/sysext/cms/tslib/class.tslib_fe.php	(revision )
@@ -3406,18 +3406,15 @@
 				'Cache-Control: max-age='.($this->cacheExpires - $GLOBALS['EXEC_TIME']),		// no-cache
 				'Pragma: public',
 			);
+				// Send headers:
+			foreach($headers as $hL)	{
+				header($hL);
+			}
 
 			$this->isClientCachable = TRUE;
 		} else {
-				// Build headers:
-			$headers = array(
-				#'Last-Modified: '.gmdate('D, d M Y H:i:s T', $this->register['SYS_LASTCHANGED']),
-				#'ETag: '.md5($this->content),
 
-				#'Cache-Control: no-cache',
-				#'Pragma: no-cache',
-				'Cache-Control: private',		// Changed to this according to Ole Tange, FI.dk
-			);
+			t3lib_utility_Http::sendNoCacheHeaders();
 
 			$this->isClientCachable = FALSE;
 
@@ -3435,12 +3432,7 @@
 				}
 			}
 		}
-
-			// Send headers:
-		foreach($headers as $hL)	{
-			header($hL);
-		}
+	}
-	}
 
 	/**
 	 * Reporting status whether we can send cache control headers for proxy caching or publishing to static files
Index: t3lib/utility/class.t3lib_utility_http.php
===================================================================
--- t3lib/utility/class.t3lib_utility_http.php	(date 1312309575000)
+++ t3lib/utility/class.t3lib_utility_http.php	(revision )
@@ -97,6 +97,34 @@
 
 		exit;
 	}
+
+
+	/**
+	 * Sends cache control headers which disable client caching.
+	 *
+	 * Prevent error message in IE when using a https connection,
+	 * see http://support.microsoft.com/kb/323308/en-us
+	 *
+	 * @static
+	 * @return void
+	 * @since 4.6
+	 * @see http://forge.typo3.org/issues/24125
+	 */
+	public static function sendNoCacheHeaders() {
+		$cacheControl = 'no-cache, must-revalidate';
+		$pragma = 'no-cache';
+
+		$clientInfo = t3lib_div::clientInfo();
+		if (($clientInfo['BROWSER'] === 'msie') && t3lib_div::getIndpEnv('TYPO3_SSL')) {
+					// Some IEs can not handle no-cache
+				$cacheControl = 'must-revalidate';
+					// IE needs "Pragma: private" if SSL connection
+				$pragma = 'private';
-}
+		}
 
+		header('Cache-Control: ' . $cacheControl);
+		header('Pragma: ' . $pragma);
+	}
+}
+
 ?>
\ No newline at end of file
Index: t3lib/class.t3lib_userauth.php
===================================================================
--- t3lib/class.t3lib_userauth.php	(date 1312309575000)
+++ t3lib/class.t3lib_userauth.php	(revision )
@@ -246,27 +246,9 @@
 		if ($this->sendNoCacheHeaders) {
 			header('Expires: 0');
 			header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
-
-			$cacheControlHeader = 'no-cache, must-revalidate';
-			$pragmaHeader = 'no-cache';
-
-				// Prevent error message in IE when using a https connection
-				// see http://forge.typo3.org/issues/24125
-			$clientInfo = t3lib_div::clientInfo();
-			if (($clientInfo['BROWSER'] === 'msie') && t3lib_div::getIndpEnv('TYPO3_SSL')) {
-
-						// Some IEs can not handle no-cache
-						// see http://support.microsoft.com/kb/323308/en-us
-					$cacheControlHeader = 'must-revalidate';
-
-						// IE needs "Pragma: private" if SSL connection
-					$pragmaHeader = 'private';
+			t3lib_utility_Http::sendNoCacheHeaders();
-			}
+		}
 
-			header('Cache-Control: ' . $cacheControlHeader);
-			header('Pragma: ' . $pragmaHeader);
-		}
-
 			// Set $this->gc_time if not explicitely specified
 		if ($this->gc_time == 0) {
 			$this->gc_time = ($this->auth_timeout_field == 0 ? 86400 : $this->auth_timeout_field); // Default to 1 day if $this->auth_timeout_field is 0
Index: typo3/sysext/form/Classes/View/Wizard/Load.php
===================================================================
--- typo3/sysext/form/Classes/View/Wizard/Load.php	(date 1312309575000)
+++ typo3/sysext/form/Classes/View/Wizard/Load.php	(revision )
@@ -80,8 +80,7 @@
 
 		header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
 		header('Last-Modified: ' . gmdate( "D, d M Y H:i:s" ) . 'GMT');
-		header('Cache-Control: no-cache, must-revalidate');
-		header('Pragma: no-cache');
+		t3lib_utility_Http::sendNoCacheHeaders();
 		header('Content-Length: '.strlen($json));
 		header('Content-Type: application/json; charset=utf-8');
 		header('Content-Transfer-Encoding: 8bit');
Index: typo3/sysext/install/mod/class.tx_install.php
===================================================================
--- typo3/sysext/install/mod/class.tx_install.php	(date 1312309575000)
+++ typo3/sysext/install/mod/class.tx_install.php	(revision )
@@ -171,8 +171,7 @@
 			header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
 			header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
 			header('Expires: 0');
-			header('Cache-Control: no-cache, must-revalidate');
-			header('Pragma: no-cache');
+			t3lib_utility_Http::sendNoCacheHeaders();
 		}
 
 			// ****************************
@@ -7770,8 +7769,7 @@
 		);
 			// Output the warning message and exit
 		header('Content-Type: text/html; charset=utf-8');
-		header('Cache-Control: no-cache, must-revalidate');
-		header('Pragma: no-cache');
+		t3lib_utility_Http::sendNoCacheHeaders();
 		echo $content;
 		exit();
 	}
Index: typo3/sysext/form/Classes/View/Wizard/Save.php
===================================================================
--- typo3/sysext/form/Classes/View/Wizard/Save.php	(date 1312309575000)
+++ typo3/sysext/form/Classes/View/Wizard/Save.php	(revision )
@@ -87,8 +87,7 @@
 
 		header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
 		header('Last-Modified: ' . gmdate( "D, d M Y H:i:s" ) . 'GMT');
-		header('Cache-Control: no-cache, must-revalidate');
-		header('Pragma: no-cache');
+		t3lib_utility_Http::sendNoCacheHeaders();
 		header('Content-Length: '.strlen($json));
 		header('Content-Type: application/json; charset=utf-8');
 		header('Content-Transfer-Encoding: 8bit');
Index: typo3/sysext/install/mod/class.tx_install_ajax.php
===================================================================
--- typo3/sysext/install/mod/class.tx_install_ajax.php	(date 1312309575000)
+++ typo3/sysext/install/mod/class.tx_install_ajax.php	(revision )
@@ -142,8 +142,7 @@
 				// see RFC 2616
 				// see Microsoft Knowledge Base #234067
 			header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
-			header('Cache-Control: no-cache, must-revalidate');
-			header('Pragma: no-cache');
+			t3lib_utility_Http::sendNoCacheHeaders();
 			header('Expires: -1');
 		}
 	}