diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index bba33bd8e..05823ab46 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -207,6 +207,7 @@ class AttachmentsController < ApplicationController
   def send_file_with_range(path, options = {})
     if File.exist?(path)
       size = File.size(path)
+      logger.info("########request.headers: #{request.headers}")
       if !request.headers["Range"]
         status_code = 200 # 200 OK
         offset = 0