config.action_view.embed_authenticity_token_in_remote_forms is true by default

Changed default value for `config.action_view.embed_authenticity_token_in_remote_forms`
to `false`. This change breaks remote forms that need to work also without javascript,
so if you need such behavior, you can either set it to `true` or explicitly pass
`:authenticity_token => true` in form options

actionpack/CHANGELOG.md

 ## Rails 4.0.0 (unreleased) ##
 
+*   Changed default value for `config.action_view.embed_authenticity_token_in_remote_forms`
+    to `false`. This change breaks remote forms that need to work also without javascript,
+    so if you need such behavior, you can either set it to `true` or explicitly pass
+    `:authenticity_token => true` in form options
+
 *   Added ActionDispatch::SSL middleware that when included force all the requests to be under HTTPS protocol. *Rafael Mendonça França*
 
 *   Add `include_hidden` option to select tag. With `:include_hidden => false` select with `multiple` attribute doesn't generate hidden input with blank value. *Vasiliy Ermolovich*

actionpack/lib/action_view/helpers/form_tag_helper.rb

@@ -19,7 +19,7 @@ module FormTagHelper
       include TextHelper
 
       mattr_accessor :embed_authenticity_token_in_remote_forms
-      self.embed_authenticity_token_in_remote_forms = true
+      self.embed_authenticity_token_in_remote_forms = false
 
       # Starts a form tag that points the action to an url configured with <tt>url_for_options</tt> just like
       # ActionController::Base#url_for. The method for the form defaults to POST.

actionpack/lib/action_view/railtie.rb

@@ -7,7 +7,7 @@ class Railtie < Rails::Railtie
     config.action_view = ActiveSupport::OrderedOptions.new
     config.action_view.stylesheet_expansions = {}
     config.action_view.javascript_expansions = { :defaults => %w(jquery jquery_ujs) }
-    config.action_view.embed_authenticity_token_in_remote_forms = true
+    config.action_view.embed_authenticity_token_in_remote_forms = false
 
     initializer "action_view.embed_authenticity_token_in_remote_forms" do |app|
       ActiveSupport.on_load(:action_view) do

actionpack/test/controller/request_forgery_protection_test.rb

@@ -116,42 +116,37 @@ def test_should_render_button_to_with_token_tag
     assert_select 'form>div>input[name=?][value=?]', 'custom_authenticity_token', @token
   end
 
-  def test_should_render_form_with_token_tag_if_remote
+  def test_should_render_form_without_token_tag_if_remote
     assert_not_blocked do
       get :form_for_remote
     end
-    assert_match(/authenticity_token/, response.body)
+    assert_no_match(/authenticity_token/, response.body)
   end
 
-  def test_should_render_form_without_token_tag_if_remote_and_embedding_token_is_off
+  def test_should_render_form_with_token_tag_if_remote_and_embedding_token_is_on
+    original = ActionView::Helpers::FormTagHelper.embed_authenticity_token_in_remote_forms
     begin
-      ActionView::Helpers::FormTagHelper.embed_authenticity_token_in_remote_forms = false
+      ActionView::Helpers::FormTagHelper.embed_authenticity_token_in_remote_forms = true
       assert_not_blocked do
         get :form_for_remote
       end
-      assert_no_match(/authenticity_token/, response.body)
+      assert_match(/authenticity_token/, response.body)
     ensure
-      ActionView::Helpers::FormTagHelper.embed_authenticity_token_in_remote_forms = true
+      ActionView::Helpers::FormTagHelper.embed_authenticity_token_in_remote_forms = original
     end
   end
 
-  def test_should_render_form_with_token_tag_if_remote_and_embedding_token_is_off_but_true_option_passed
-     begin
-      ActionView::Helpers::FormTagHelper.embed_authenticity_token_in_remote_forms = false
+  def test_should_render_form_with_token_tag_if_remote_and_external_authenticity_token_requested_and_embedding_is_on
+    original = ActionView::Helpers::FormTagHelper.embed_authenticity_token_in_remote_forms
+    begin
+      ActionView::Helpers::FormTagHelper.embed_authenticity_token_in_remote_forms = true
       assert_not_blocked do
-        get :form_for_remote_with_token
+        get :form_for_remote_with_external_token
       end
-      assert_match(/authenticity_token/, response.body)
+      assert_select 'form>div>input[name=?][value=?]', 'custom_authenticity_token', 'external_token'
     ensure
-      ActionView::Helpers::FormTagHelper.embed_authenticity_token_in_remote_forms = true
-    end
-  end
-
-  def test_should_render_form_with_token_tag_if_remote_and_external_authenticity_token_requested
-    assert_not_blocked do
-      get :form_for_remote_with_external_token
+      ActionView::Helpers::FormTagHelper.embed_authenticity_token_in_remote_forms = original
     end
-    assert_select 'form>div>input[name=?][value=?]', 'custom_authenticity_token', 'external_token'
   end
 
   def test_should_render_form_with_token_tag_if_remote_and_authenticity_token_requested

guides/source/configuring.textile

@@ -395,7 +395,7 @@ And can reference in the view with the following code:
 
 * +config.action_view.cache_asset_ids+ With the cache enabled, the asset tag helper methods will make fewer expensive file system calls (the default implementation checks the file system timestamp). However this prevents you from modifying any asset files while the server is running.
 
-* +config.action_view.embed_authenticity_token_in_remote_forms+ This is by default set to true. If you set it to false, authenticity_token will not be added to forms with +:remote => true+ by default. You can force +authenticity_token+ to be added to such remote form by passing +:authenticity_token => true+ option.
+* +config.action_view.embed_authenticity_token_in_remote_forms+ allows you to set the default behavior for +authenticity_token+ in forms with +:remote => true+. By default it's set to false, which means that remote forms will not include +authenticity_token+, which is helpful when you're fragment-caching the form. Remote forms get the authenticity from the +meta+ tag, so embedding is unnecessary unless you support browsers without JavaScript. In such case you can either pass +:authenticity_token => true+ as a form option or set this config setting to +true+
 
 h4. Configuring Action Mailer