added cache to the showAction to reduce network requests

application/File/FileController.php

@@ -99,7 +99,9 @@ class FileController extends mfBaseController {
 
         $originalPath = MFUPLOAD_FILE_SAVE_PATH . ($file->subfolder ? "/{$file->subfolder}" : "") . "/{$file->store_filename}";
         if (!is_readable($originalPath)) self::sendError("Physical file not found");
-
+        header("Cache-Control: public, max-age=604800");
+        header("Expires: " . gmdate("D, d M Y H:i:s", time() + 604800) . " GMT");
+        header("Last-Modified: " . gmdate("D, d M Y H:i:s", filemtime($originalPath)) . " GMT");
 
         $imageInfo = @getimagesize($originalPath);
 
@@ -140,4 +142,4 @@ class FileController extends mfBaseController {
         readfile($cachedPath);
         exit;
     }
-}
+}