Fix #141 - Add "Server: Mastodon" header to responses

config/application.rb

@@ -47,6 +47,7 @@ module Mastodon
     end
 
     config.action_dispatch.default_headers = {
+      'Server'                 => 'Mastodon',
       'X-Frame-Options'        => 'DENY',
       'X-Content-Type-Options' => 'nosniff',
       'X-XSS-Protection'       => '1; mode=block'