From c931ace58d93cc4313b866c5324474c46c204872 Mon Sep 17 00:00:00 2001
From: garvinhicking <garvinhicking>
Date: Wed, 30 Aug 2006 09:51:59 +0000
Subject: [PATCH] Allow to use Cache-Control

---
 docs/NEWS                  | 3 +++
 index.php                  | 9 +++++++++
 serendipity_config.inc.php | 4 ++++
 3 files changed, 16 insertions(+)

diff --git a/docs/NEWS b/docs/NEWS
index 9431837..cf41f79 100644
--- a/docs/NEWS
+++ b/docs/NEWS
@@ -3,6 +3,9 @@
 Version 1.1-beta4 ()
 ------------------------------------------------------------------------
 
+    * Allow to set $serendipity['CacheControl'] to make serendipity emit
+      Cache-Control: HTTP headers. Thanks to annonymous from the forums!
+      
     * Use seperate PHP session ID when using HTTPS login. Set 'secure'
       cookie parameters when using HTTPS. Thanks to lynoure!
 
diff --git a/index.php b/index.php
index 061b499..24a6842 100644
--- a/index.php
+++ b/index.php
@@ -23,6 +23,15 @@ header('X-Blog: Serendipity'); // Used for installer detection
 ob_start();
 include('serendipity_config.inc.php');
 header('Content-Type: text/html; charset='. LANG_CHARSET);
+if ($serendipity['CacheControl']) {
+    if (!empty($HTTP_SERVER_VARS['SERVER_SOFTWARE']) && strstr($HTTP_SERVER_VARS['SERVER_SOFTWARE'], 'Apache/2')) {
+        header('Cache-Control: no-cache, pre-check=0, post-check=0');
+    } else {
+        header('Cache-Control: private, pre-check=0, post-check=0, max-age=0');
+    }
+    header('Expires: 0');
+    header('Pragma: no-cache'); 
+}
 $track_referer = true;
 $uri = $_SERVER['REQUEST_URI'];
 
diff --git a/serendipity_config.inc.php b/serendipity_config.inc.php
index 1de8dea..ddaf750 100644
--- a/serendipity_config.inc.php
+++ b/serendipity_config.inc.php
@@ -87,6 +87,10 @@ if (!isset($serendipity['useHTTP-Auth'])) {
     $serendipity['useHTTP-Auth'] = true;
 }
 
+if (!isset($serendipity['CacheControl'])) {
+    $serendipity['CacheControl'] = false;
+}
+
 // Should IFRAMEs be used for previewing entries and sending trackbacks?
 $serendipity['use_iframe'] = true;
 
-- 
2.39.5