diff --git a/app/action.rb b/app/action.rb
index 5af057a..38b967c 100644
--- a/app/action.rb
+++ b/app/action.rb
@@ -23,7 +23,7 @@ module Adamantium
     handle_exception StandardError => :handle_error
 
     config.default_headers = {
-      "Content-Type" => "text/html"
+      "Content-Type" => "application/octet-stream"
     }
 
     def cache(key:, content:)
diff --git a/config.ru b/config.ru
index 82c96ea..f1ef051 100644
--- a/config.ru
+++ b/config.ru
@@ -20,9 +20,9 @@ end
 
 require "adamantium/middleware/header_fix"
 use Adamantium::Middleware::HeaderFix do |headers, env|
-  # if env["REQUEST_METHOD"] == "HEAD"
+  if env["REQUEST_METHOD"] == "HEAD"
     headers['Content-Type'] = "text/html"
-  # end
+  end
 end
 
 run Hanami.app