Fix Rack bug rack/rack#301

config.ru

@@ -1,6 +1,9 @@
 require 'rack/codehighlighter'
 require 'coderay'
 
+# Fix Rack bug https://github.com/rack/rack/issues/301
+require './lib/rack_static_patch'
+
 use Rack::ShowExceptions
 use Rack::ShowStatus
 use Rack::Static, :urls => ["/css", "/img"], :root => "public"

lib/rack_static_patch.rb

@@ -0,0 +1,13 @@
+# Fix Rack bug https://github.com/rack/rack/issues/301
+module Rack
+  class Static
+    def initialize(app, options={})
+      @app = app
+      @urls = options[:urls] || ["/favicon.ico"]
+      @index = options[:index]
+      root = options[:root] || Dir.pwd
+      cache_control = options[:cache_control]
+      @file_server = Rack::File.new(root, cache_control)
+    end
+  end
+end