stop applying default headers in ActionDispatch::Response

I'm making this change so that I can construct response objects that
*don't* have the default headers applied.  For example, I would like to
construct a response object from the return value of a controller.

If you need to construct a response object with the default headers,
then please use the alternate constructor:
`ActionDispatch::Response.create`

1 files changed, 4 insertions, 4 deletions

diff --git a/actionpack/lib/action_controller/metal/live.rb b/actionpack/lib/action_controller/metal/live.rb
index 667c7f87ca..c874165816 100644
--- a/actionpack/lib/action_controller/metal/live.rb
+++ b/actionpack/lib/action_controller/metal/live.rb
@@ -236,6 +236,10 @@ module ActionController
         end
       end
 
+      def initialize(status = 200, header = {}, body = [])
+        super(status, Header.new(self, header), body)
+      end
+
       private
 
       def before_committed
@@ -257,10 +261,6 @@ module ActionController
         buf
       end
 
-      def merge_default_headers(original, default)
-        Header.new self, super
-      end
-
       def handle_conditional_get!
         super unless committed?
       end