config.ru in jellyfish-1.3.1 vs config.ru in jellyfish-1.4.0

@@ -5,11 +5,11 @@
 class Jelly
   include Jellyfish
 
   controller_include Module.new{
     def dispatch
-      headers_merge 'Content-Type' => 'application/json; charset=utf-8',
+      headers_merge 'content-type' => 'application/json; charset=utf-8',
                     'Access-Control-Allow-Origin' => '*'
       super
     end
 
     def render obj
@@ -57,10 +57,9 @@
   end
 end
 
 App = Jellyfish::Builder.app do
   use Rack::CommonLogger
-  use Rack::Chunked
   use Rack::ContentLength
   use Rack::Deflater
 
   run Rack::Cascade.new([Rack::File.new('public/index.html'),
                          Rack::File.new('public'),