diff --git a/actionpack/lib/action_controller.rb b/actionpack/lib/action_controller.rb
index 89fc4520d3..3d3af555c9 100644
--- a/actionpack/lib/action_controller.rb
+++ b/actionpack/lib/action_controller.rb
@@ -30,7 +30,6 @@ module ActionController
     autoload :Instrumentation
     autoload :MimeResponds
     autoload :ParamsWrapper
-    autoload :RackDelegation
     autoload :Redirecting
     autoload :Renderers
     autoload :Rendering
diff --git a/actionpack/lib/action_controller/api.rb b/actionpack/lib/action_controller/api.rb
index b4594bf302..1a46d49a49 100644
--- a/actionpack/lib/action_controller/api.rb
+++ b/actionpack/lib/action_controller/api.rb
@@ -115,7 +115,6 @@ module ActionController
       Rendering,
       Renderers::All,
       ConditionalGet,
-      RackDelegation,
       BasicImplicitRender,
       StrongParameters,
 
diff --git a/actionpack/lib/action_controller/base.rb b/actionpack/lib/action_controller/base.rb
index 105f69884d..6c644862d5 100644
--- a/actionpack/lib/action_controller/base.rb
+++ b/actionpack/lib/action_controller/base.rb
@@ -213,7 +213,6 @@ module ActionController
       Renderers::All,
       ConditionalGet,
       EtagWithTemplateDigest,
-      RackDelegation,
       Caching,
       MimeResponds,
       ImplicitRender,
diff --git a/actionpack/lib/action_controller/caching.rb b/actionpack/lib/action_controller/caching.rb
index 2801db0154..0b8fa2ea09 100644
--- a/actionpack/lib/action_controller/caching.rb
+++ b/actionpack/lib/action_controller/caching.rb
@@ -45,7 +45,6 @@ module ActionController
         end
     end
 
-    include RackDelegation
     include AbstractController::Callbacks
 
     include ConfigMethods
diff --git a/actionpack/lib/action_controller/metal.rb b/actionpack/lib/action_controller/metal.rb
index f7be1e1fc5..030a1f3478 100644
--- a/actionpack/lib/action_controller/metal.rb
+++ b/actionpack/lib/action_controller/metal.rb
@@ -1,6 +1,8 @@
 require 'active_support/core_ext/array/extract_options'
 require 'action_dispatch/middleware/stack'
 require 'active_support/deprecation'
+require 'action_dispatch/http/request'
+require 'action_dispatch/http/response'
 
 module ActionController
   # Extend ActionDispatch middleware stack to make it aware of options
@@ -138,20 +140,22 @@ module ActionController
       end
     end
 
+    def self.build_with_env(env = {}) #:nodoc:
+      new.tap { |c|
+        c.set_request! ActionDispatch::Request.new(env)
+        c.set_response! make_response!(c.request)
+      }
+    end
+
     # Delegates to the class' <tt>controller_name</tt>
     def controller_name
       self.class.controller_name
     end
 
-    # The details below can be overridden to support a specific
-    # Request and Response object. The default ActionController::Base
-    # implementation includes RackDelegation, which makes a request
-    # and response object available. You might wish to control the
-    # environment and response manually for performance reasons.
-
     attr_internal :response, :request
     delegate :session, :to => "@_request"
-    delegate :headers, :to => "@_response"
+    delegate :headers, :status=, :location=, :content_type=,
+             :status, :location, :content_type, :to => "@_response"
 
     def initialize
       @_request = nil
@@ -168,40 +172,13 @@ module ActionController
       @_params = val
     end
 
-    # Basic implementations for content_type=, location=, and headers are
-    # provided to reduce the dependency on the RackDelegation module
-    # in Renderer and Redirector.
-
-    def content_type=(type)
-      response.content_type = type
-    end
-
-    def content_type
-      response.content_type
-    end
-
-    def location
-      headers["Location"]
-    end
-
-    def location=(url)
-      headers["Location"] = url
-    end
+    alias :response_code :status # :nodoc:
 
     # Basic url_for that can be overridden for more robust functionality
     def url_for(string)
       string
     end
 
-    def status
-      response.status
-    end
-    alias :response_code :status # :nodoc:
-
-    def status=(status)
-      response.status = Rack::Utils.status_code(status)
-    end
-
     def response_body=(body)
       body = [body] unless body.nil? || body.respond_to?(:each)
       response.body = body
@@ -233,6 +210,10 @@ module ActionController
       response.to_a
     end
 
+    def reset_session
+      @_request.reset_session
+    end
+
     class_attribute :middleware_stack
     self.middleware_stack = ActionController::MiddlewareStack.new
 
diff --git a/actionpack/lib/action_controller/metal/conditional_get.rb b/actionpack/lib/action_controller/metal/conditional_get.rb
index bb3ad9b850..89d589c486 100644
--- a/actionpack/lib/action_controller/metal/conditional_get.rb
+++ b/actionpack/lib/action_controller/metal/conditional_get.rb
@@ -4,7 +4,6 @@ module ActionController
   module ConditionalGet
     extend ActiveSupport::Concern
 
-    include RackDelegation
     include Head
 
     included do
diff --git a/actionpack/lib/action_controller/metal/cookies.rb b/actionpack/lib/action_controller/metal/cookies.rb
index d787f014cd..f8efb2b076 100644
--- a/actionpack/lib/action_controller/metal/cookies.rb
+++ b/actionpack/lib/action_controller/metal/cookies.rb
@@ -2,8 +2,6 @@ module ActionController #:nodoc:
   module Cookies
     extend ActiveSupport::Concern
 
-    include RackDelegation
-
     included do
       helper_method :cookies
     end
diff --git a/actionpack/lib/action_controller/metal/instrumentation.rb b/actionpack/lib/action_controller/metal/instrumentation.rb
index a3e1a71b0a..3dbf34eb2a 100644
--- a/actionpack/lib/action_controller/metal/instrumentation.rb
+++ b/actionpack/lib/action_controller/metal/instrumentation.rb
@@ -11,7 +11,6 @@ module ActionController
     extend ActiveSupport::Concern
 
     include AbstractController::Logger
-    include ActionController::RackDelegation
 
     attr_internal :view_runtime
 
diff --git a/actionpack/lib/action_controller/metal/rack_delegation.rb b/actionpack/lib/action_controller/metal/rack_delegation.rb
deleted file mode 100644
index 3c595a2656..0000000000
--- a/actionpack/lib/action_controller/metal/rack_delegation.rb
+++ /dev/null
@@ -1,21 +0,0 @@
-require 'action_dispatch/http/request'
-require 'action_dispatch/http/response'
-
-module ActionController
-  module RackDelegation
-    extend ActiveSupport::Concern
-
-    delegate :headers, :status=, :location=, :content_type=,
-             :status, :location, :content_type, :response_code, :to => "@_response"
-
-    module ClassMethods
-      def build_with_env(env = {}) #:nodoc:
-        new.tap { |c| c.set_request! ActionDispatch::Request.new(env) }
-      end
-    end
-
-    def reset_session
-      @_request.reset_session
-    end
-  end
-end
diff --git a/actionpack/lib/action_controller/metal/redirecting.rb b/actionpack/lib/action_controller/metal/redirecting.rb
index acaa8227c9..0febc905f1 100644
--- a/actionpack/lib/action_controller/metal/redirecting.rb
+++ b/actionpack/lib/action_controller/metal/redirecting.rb
@@ -11,7 +11,6 @@ module ActionController
     extend ActiveSupport::Concern
 
     include AbstractController::Logger
-    include ActionController::RackDelegation
     include ActionController::UrlFor
 
     # Redirects the browser to the target specified in +options+. This parameter can be any one of:
diff --git a/actionpack/lib/action_controller/metal/testing.rb b/actionpack/lib/action_controller/metal/testing.rb
index d01927b7cb..47d940f692 100644
--- a/actionpack/lib/action_controller/metal/testing.rb
+++ b/actionpack/lib/action_controller/metal/testing.rb
@@ -2,8 +2,6 @@ module ActionController
   module Testing
     extend ActiveSupport::Concern
 
-    include RackDelegation
-
     # TODO : Rewrite tests using controller.headers= to use Rack env
     def headers=(new_headers)
       @_response ||= ActionDispatch::Response.new
diff --git a/actionpack/test/controller/new_base/bare_metal_test.rb b/actionpack/test/controller/new_base/bare_metal_test.rb
index 77c9c13e96..e61f4d241b 100644
--- a/actionpack/test/controller/new_base/bare_metal_test.rb
+++ b/actionpack/test/controller/new_base/bare_metal_test.rb
@@ -2,8 +2,6 @@ require "abstract_unit"
 
 module BareMetalTest
   class BareController < ActionController::Metal
-    include ActionController::RackDelegation
-
     def index
       self.response_body = "Hello world"
     end
diff --git a/actionpack/test/controller/render_test.rb b/actionpack/test/controller/render_test.rb
index 4a6086cf78..82c7ebf568 100644
--- a/actionpack/test/controller/render_test.rb
+++ b/actionpack/test/controller/render_test.rb
@@ -234,8 +234,6 @@ class MetalTestController < ActionController::Metal
   include AbstractController::Rendering
   include ActionView::Rendering
   include ActionController::Rendering
-  include ActionController::RackDelegation
-
 
   def accessing_logger_in_template
     render :inline =>  "<%= logger.class %>"
diff --git a/guides/source/api_app.md b/guides/source/api_app.md
index 1652d91086..7f1792181e 100644
--- a/guides/source/api_app.md
+++ b/guides/source/api_app.md
@@ -363,9 +363,6 @@ controller modules by default:
 - `ActionController::Renderers::All`: Support for `render :json` and friends.
 - `ActionController::ConditionalGet`: Support for `stale?`.
 - `ActionController::ForceSSL`: Support for `force_ssl`.
-- `ActionController::RackDelegation`: Support for the `request` and `response`
-  methods returning `ActionDispatch::Request` and `ActionDispatch::Response`
-  objects.
 - `ActionController::DataStreaming`: Support for `send_file` and `send_data`.
 - `AbstractController::Callbacks`: Support for `before_action` and friends.
 - `ActionController::Instrumentation`: Support for the instrumentation