Add Expires header for cached file , diff included

[bigb06]

Hello,

I've found that cached file add last-modified-headers, but not expires header.
Since it's useful for browsers and for CDN like Cloudflare, I add Expires header calculated with timestamp and cache_lifetime
DIFF FOR SMARTY v 4

--- libs/sysplugins/smarty_internal_runtime_cachemodify.php	2024-03-18 15:19:07.000000000 +0100
+++ libs/sysplugins/smarty_internal_runtime_cachemodify.php	2024-03-18 15:19:07.000000000 +0100
@@ -59,6 +59,8 @@
                     }
                     break;
                 default:
+                    // // add headers, file just created, expires set to now + cache time
+                    header('Expires: ' . gmdate('D, d M Y H:i:s',$cached->timestamp+$cached->cache_lifetime) . ' GMT');
                     header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $cached->timestamp) . ' GMT');
                     break;
             }

[bigb06]

DIFF FOR SMARTY v 5

--- src/Smarty.php	2024-07-16 13:16:33
+++ src/Smarty_new.php	2024-07-16 13:16:22
@@ -1566,6 +1566,8 @@
 					}
 					break;
 				default:
+					// add headers, file just created, expires set to now + cache time
+					header('Expires: ' . gmdate('D, d M Y H:i:s',$cached->timestamp+$cached->cache_lifetime) . ' GMT');
 					header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $cached->timestamp) . ' GMT');
 					break;
 			}