added page expires

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

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);