2 files changed, 6 insertions, 8 deletions
diff --git a/actionpack/lib/action_controller/metal/rack_delegation.rb b/actionpack/lib/action_controller/metal/rack_delegation.rb
index bdf6e88699..e1bee9e60c 100644
--- a/actionpack/lib/action_controller/metal/rack_delegation.rb
+++ b/actionpack/lib/action_controller/metal/rack_delegation.rb
@@ -5,8 +5,8 @@ module ActionController
   module RackDelegation
     extend ActiveSupport::Concern
 
-    delegate :headers, :status=, :location=, :content_type=,
-             :status, :location, :content_type, :to => "@_response"
+    delegate :headers, :status=, :location=, :content_type=, :no_content_type=,
+             :status, :location, :content_type, :no_content_type, :to => "@_response"
 
     def dispatch(action, request)
       set_response!(request)
diff --git a/actionpack/lib/action_controller/metal/rendering.rb b/actionpack/lib/action_controller/metal/rendering.rb
index ce37eaefd8..3c4ef596c7 100644
--- a/actionpack/lib/action_controller/metal/rendering.rb
+++ b/actionpack/lib/action_controller/metal/rendering.rb
@@ -44,15 +44,13 @@ module ActionController
 
     def _process_format(format, options = {})
       super
-      self.content_type ||= format.to_s
 
-      if options[:body].present?
-        self.content_type = "none"
+      if options[:body]
         self.headers.delete "Content-Type"
-      end
-
-      if options[:plain].present?
+      elsif options[:plain]
         self.content_type = Mime::TEXT
+      else
+        self.content_type ||= format.to_s
       end
     end