diff --git a/actionpack/lib/action_dispatch/http/response.rb b/actionpack/lib/action_dispatch/http/response.rb
index 4f35a00247bc39647cce3eebb0e458ec608c719b..378fd5e61d663a85c596995c878deb90f5144b24 100644
--- a/actionpack/lib/action_dispatch/http/response.rb
+++ b/actionpack/lib/action_dispatch/http/response.rb
@@ -49,6 +49,9 @@ def initialize
       @body, @cookie = [], []
       @sending_file = false
 
+      @blank = false
+      @etag = nil
+
       yield self if block_given?
     end