From b4c06f537da74eb43c23975c8465db5a30b86df5 Mon Sep 17 00:00:00 2001
From: Andy Miller <rhuk@mac.com>
Date: Tue, 14 Apr 2015 19:08:46 -0600
Subject: [PATCH] added page expires

---
 system/config/system.yaml       | 2 ++
 system/src/Grav/Common/Grav.php | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/system/config/system.yaml b/system/config/system.yaml
index 4744a01ed..ba2a153a9 100644
--- a/system/config/system.yaml
+++ b/system/config/system.yaml
@@ -31,6 +31,7 @@ pages:
       '>': 'gt'
       '<': 'lt'
   types: 'txt|xml|html|json|rss|atom'  # Pipe separated list of valid page types
+  expires: 604800                      # Page expires time in seconds (default 7 days)
 
 cache:
   enabled: true                        # Set to true to enable caching
@@ -41,6 +42,7 @@ cache:
   lifetime: 604800                     # Lifetime of cached data in seconds (0 = infinite)
   gzip: false                          # GZip compress the page output
 
+
 twig:
   cache: true                          # Set to true to enable twig caching
   debug: false                         # Enable Twig debug
diff --git a/system/src/Grav/Common/Grav.php b/system/src/Grav/Common/Grav.php
index 832c00e89..37cee3cd8 100644
--- a/system/src/Grav/Common/Grav.php
+++ b/system/src/Grav/Common/Grav.php
@@ -298,6 +298,8 @@ class Grav extends Container
         $extension = $this['uri']->extension();
         header('Content-type: ' . $this->mime($extension));
 
+        header('Expires: '.gmdate('D, d M Y H:i:s \G\M\T', time() + $this['config']->get('system.pages.expires')));
+
         // Set debugger data in headers
         if (!($extension === null || $extension == 'html')) {
             $this['debugger']->enabled(false);