Following error happens with Rack gem installed and vendored 2.3.2 rails: /!\ FAILSAFE /!\ 06/08/2009 17:48 PM Status: 500 Internal Server Error private method split' called for #<Mime::Type:0x226f618> /Users/ian/Projects/app/vendor/rails/actionpack/lib/action_controller/mime_type.rb:206:in `method_missing' /Library/Ruby/Gems/1.8/gems/rack-1.0.0/lib/rack/request.rb:51:in `media_type' /Library/Ruby