diff --git a/actionpack/lib/action_controller/metal/request_forgery_protection.rb b/actionpack/lib/action_controller/metal/request_forgery_protection.rb
index 8def048178..6a55a61abe 100644
--- a/actionpack/lib/action_controller/metal/request_forgery_protection.rb
+++ b/actionpack/lib/action_controller/metal/request_forgery_protection.rb
@@ -139,7 +139,7 @@ module ActionController #:nodoc:
           request.session = NullSessionHash.new(request.env)
           request.env['action_dispatch.request.flash_hash'] = nil
           request.env['rack.session.options'] = { skip: true }
-          request.env['action_dispatch.cookies'] = NullCookieJar.build(request)
+          request.env['action_dispatch.cookies'] = NullCookieJar.build(request, {})
         end
 
         protected
@@ -160,12 +160,6 @@ module ActionController #:nodoc:
         end
 
         class NullCookieJar < ActionDispatch::Cookies::CookieJar #:nodoc:
-          def self.build(request)
-            host          = request.host
-
-            new(host, request)
-          end
-
           def write(*)
             # nothing
           end
diff --git a/actionpack/lib/action_dispatch/middleware/cookies.rb b/actionpack/lib/action_dispatch/middleware/cookies.rb
index 275e16c802..41c4523ecb 100644
--- a/actionpack/lib/action_dispatch/middleware/cookies.rb
+++ b/actionpack/lib/action_dispatch/middleware/cookies.rb
@@ -259,16 +259,14 @@ module ActionDispatch
       DOMAIN_REGEXP = /[^.]*\.([^.]*|..\...|...\...)$/
 
       def self.build(req, cookies)
-        host = req.host
-        new(host, req).tap do |hash|
+        new(req).tap do |hash|
           hash.update(cookies)
         end
       end
 
-      def initialize(host = nil, request)
+      def initialize(request)
         @set_cookies = {}
         @delete_cookies = {}
-        @host = host
         @request = request
         @cookies = {}
         @committed = false
@@ -318,12 +316,12 @@ module ActionDispatch
 
           # if host is not ip and matches domain regexp
           # (ip confirms to domain regexp so we explicitly check for ip)
-          options[:domain] = if (@host !~ /^[\d.]+$/) && (@host =~ domain_regexp)
+          options[:domain] = if (@request.host !~ /^[\d.]+$/) && (@request.host =~ domain_regexp)
             ".#{$&}"
           end
         elsif options[:domain].is_a? Array
           # if host matches one of the supplied domains without a dot in front of it
-          options[:domain] = options[:domain].find {|domain| @host.include? domain.sub(/^\./, '') }
+          options[:domain] = options[:domain].find {|domain| @request.host.include? domain.sub(/^\./, '') }
         end
       end