From d4aeaef63c366dc1d5e147d777f1c04d8d5aae57 Mon Sep 17 00:00:00 2001
From: Urban Müller
Date: Tue, 26 Aug 2014 19:15:57 +0200
Subject: 30 day expire if checksum is present

---
 itjs.php | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to 'itjs.php')

diff --git a/itjs.php b/itjs.php
index 3fc5441..32267da 100644
--- a/itjs.php
+++ b/itjs.php
@@ -65,12 +65,13 @@ else if (!it::match('\.html$', $file))
 	header("Content-Type: application/x-javascript; charset=$charset");
 }
 
-@header("Etag: alwaysvalid");
+@header("Etag: alwaysvalid"); # we have checksums in the url. client should always keep the version he downloaded along with the html
 
 if (!preg_match('/Opera/', $_SERVER['HTTP_USER_AGENT']) && it::is_live() && !$_REQUEST['retry'])
 {
-	header("Cache-Control: max-age=604800, private"); # proxies should not cache since contents of same url can differ between browsers
-	header("Expires: " . gmdate("D, d M Y H:i:s", time()+604800). " GMT");
+	$keeptime = $_REQUEST['s'] || $_REQUEST['c'] ? 86400*30 : 900; # long expire if checksum present
+	header("Cache-Control: max-age=$keeptime, private"); # proxies should not cache since contents of same url can differ between browsers
+	header("Expires: " . gmdate("D, d M Y H:i:s", time() + $keeptime). " GMT");
 }
 
 $data = itjs::strip($data);
-- 
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