Temporarily ship with ContentLength middleware.

Gemfile

@@ -11,7 +11,6 @@ end
 gem "coffee-script"
 gem "sass"
 gem "uglifier", :git => "git://github.com/lautis/uglifier.git"
-gem "rack", :git => "git://github.com/rack/rack.git"
 
 gem "rake",  ">= 0.8.7"
 gem "mocha", ">= 0.9.8"

actionpack/actionpack.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |s|
   s.add_dependency('rack-cache',       '~> 1.0.1')
   s.add_dependency('builder',          '~> 3.0.0')
   s.add_dependency('i18n',             '~> 0.6.0beta1')
-  s.add_dependency('rack',             '~> 1.3.0.beta')
+  s.add_dependency('rack',             '~> 1.3.0.beta2')
   s.add_dependency('rack-test',        '~> 0.6.0')
   s.add_dependency('rack-mount',       '~> 0.8.1')
   s.add_dependency('sprockets',        '~> 2.0.0.beta.5')

railties/lib/rails/application.rb

@@ -141,7 +141,7 @@ def config
 
     def default_middleware_stack
       ActionDispatch::MiddlewareStack.new.tap do |middleware|
-        middleware.use ::Rack::ContentLength, config.action_dispatch.x_sendfile_header
+        middleware.use ::Rails::Rack::ContentLength, config.action_dispatch.x_sendfile_header
 
         if rack_cache = config.action_controller.perform_caching && config.action_dispatch.rack_cache
           require "action_dispatch/http/rack_cache"

railties/lib/rails/rack.rb

@@ -1,8 +1,8 @@
 module Rails
   module Rack
-    autoload :Debugger,  "rails/rack/debugger"
-    autoload :Logger,    "rails/rack/logger"
-    autoload :LogTailer, "rails/rack/log_tailer"
-    autoload :Static,    "rails/rack/static"
+    autoload :ContentLength, "rails/rack/content_length"
+    autoload :Debugger,      "rails/rack/debugger"
+    autoload :Logger,        "rails/rack/logger"
+    autoload :LogTailer,     "rails/rack/log_tailer"
   end
 end

railties/lib/rails/rack/content_length.rb

@@ -0,0 +1,38 @@
+require 'action_dispatch'
+require 'rack/utils'
+
+module Rails
+  module Rack
+    # Sets the Content-Length header on responses with fixed-length bodies.
+    class ContentLength
+      include ::Rack::Utils
+
+      def initialize(app, sendfile=nil)
+        @app = app
+        @sendfile = sendfile
+      end
+
+      def call(env)
+        status, headers, body = @app.call(env)
+        headers = HeaderHash.new(headers)
+
+        if !STATUS_WITH_NO_ENTITY_BODY.include?(status.to_i) &&
+           !headers['Content-Length'] &&
+           !headers['Transfer-Encoding'] &&
+           !(@sendfile && headers[@sendfile])
+
+          old_body = body
+          body, length = [], 0
+          old_body.each do |part|
+            body << part
+            length += bytesize(part)
+          end
+          old_body.close if old_body.respond_to?(:close)
+          headers['Content-Length'] = length.to_s
+        end
+
+        [status, headers, body]
+      end
+    end
+  end
+end

railties/test/application/middleware_test.rb

@@ -19,7 +19,7 @@ def app
       boot!
 
       assert_equal [
-        "Rack::ContentLength",
+        "Rails::Rack::ContentLength",
         "ActionDispatch::Static",
         "Rack::Lock",
         "ActiveSupport::Cache::Strategy::LocalCache",
@@ -104,7 +104,7 @@ def app
     end
 
     test "insert middleware after" do
-      add_to_config "config.middleware.insert_after Rack::ContentLength, Rack::Config"
+      add_to_config "config.middleware.insert_after Rails::Rack::ContentLength, Rack::Config"
       boot!
       assert_equal "Rack::Config", middleware.second
     end
@@ -127,7 +127,7 @@ def app
     end
 
     test "insert middleware before" do
-      add_to_config "config.middleware.insert_before Rack::ContentLength, Rack::Config"
+      add_to_config "config.middleware.insert_before Rails::Rack::ContentLength, Rack::Config"
       boot!
       assert_equal "Rack::Config", middleware.first
     end